LeetCode

:pencil2: LeetCode solutions in C++ 11 and Python3

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leetcode

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LeetCodeAnimation

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Demonstrate all the questions on LeetCode in the form of animation.（用动画的形式呈现解LeetCode题目的思路）

LeetCode-Go

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✅ Solutions to LeetCode by Go, 100% test coverage, runtime beats 100% / LeetCode 题解

Leetcode

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Solutions to LeetCode problems; updated daily. Subscribe to my YouTube channel for more.

LeetCode-Solutions

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🏋️ Python / Modern C++ Solutions of All 3283 LeetCode Problems (Weekly Update)

Quick Overview

The pezy/LeetCode repository is a collection of LeetCode problem solutions implemented in C++. It serves as a resource for developers preparing for coding interviews or improving their algorithmic skills. The repository contains a wide range of problems from various difficulty levels, providing comprehensive coverage of LeetCode challenges.

Pros

Extensive collection of LeetCode solutions in C++
Well-organized structure with solutions categorized by problem number
Includes detailed comments and explanations for many solutions
Regularly updated with new problem solutions

Cons

Primarily focuses on C++ implementations, limiting usefulness for developers using other languages
Some solutions may lack detailed explanations or alternative approaches
Not all LeetCode problems are covered, though the collection is substantial
May encourage direct copying of solutions rather than independent problem-solving

Code Examples

Here are a few examples of solutions from the repository:

Two Sum problem (Problem 1):

class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        unordered_map<int, int> map;
        for (int i = 0; i < nums.size(); ++i) {
            int complement = target - nums[i];
            if (map.count(complement))
                return {map[complement], i};
            map[nums[i]] = i;
        }
        return {};
    }
};

This solution uses a hash map to efficiently find the complement of each number.

Add Two Numbers problem (Problem 2):

class Solution {
public:
    ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {
        ListNode dummy(0);
        ListNode* curr = &dummy;
        int carry = 0;
        while (l1 || l2 || carry) {
            int sum = (l1 ? l1->val : 0) + (l2 ? l2->val : 0) + carry;
            carry = sum / 10;
            curr->next = new ListNode(sum % 10);
            curr = curr->next;
            l1 = l1 ? l1->next : nullptr;
            l2 = l2 ? l2->next : nullptr;
        }
        return dummy.next;
    }
};

This solution adds two numbers represented as linked lists, handling carry and different list lengths.

Getting Started

To use these solutions:

Clone the repository:

git clone https://github.com/pezy/LeetCode.git

Navigate to the specific problem's directory:
```
cd LeetCode/algorithms
```
Open the desired solution file (e.g., 001.two-sum.cpp) in your preferred C++ IDE or text editor.

Compile and run the code to test the solution:

g++ -std=c++11 001.two-sum.cpp -o solution
./solution

Note: Make sure you have a C++11 compatible compiler installed on your system.

Competitor Comparisons

leetcode

54,606

LeetCode Solutions: A Record of My Problem Solving Journey.( leetcode题解，记录自己的leetcode解题之路。)

Pros of leetcode

More comprehensive coverage with solutions in multiple languages (JavaScript, Python, C++, Java)
Includes detailed explanations and analysis for many problems
Actively maintained with frequent updates and contributions

Cons of leetcode

Less organized structure compared to LeetCode's clear categorization
May be overwhelming for beginners due to the large volume of content
Some solutions lack consistency in coding style and documentation

Code Comparison

LeetCode (C++):

class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        unordered_map<int, int> map;
        for (int i = 0; i < nums.size(); ++i) {
            if (map.count(target - nums[i])) return {map[target - nums[i]], i};
            map[nums[i]] = i;
        }
        return {};
    }
};

leetcode (JavaScript):

var twoSum = function(nums, target) {
    const map = new Map();
    for (let i = 0; i < nums.length; i++) {
        const complement = target - nums[i];
        if (map.has(complement)) return [map.get(complement), i];
        map.set(nums[i], i);
    }
};

Both repositories provide solutions to LeetCode problems, but leetcode offers a wider range of languages and more detailed explanations. LeetCode maintains a cleaner structure, while leetcode provides a more extensive collection of solutions and discussions.

LeetCodeAnimation

75,422

Demonstrate all the questions on LeetCode in the form of animation.（用动画的形式呈现解LeetCode题目的思路）

Pros of LeetCodeAnimation

Provides animated visualizations of algorithms, making them easier to understand
Covers a wide range of LeetCode problems with detailed explanations
Includes solutions in multiple programming languages

Cons of LeetCodeAnimation

Less comprehensive coverage of LeetCode problems compared to LeetCode
Animations may not be as helpful for experienced programmers who prefer concise code solutions
Updates less frequently than LeetCode

Code Comparison

LeetCode (C++ solution for Two Sum):

vector<int> twoSum(vector<int>& nums, int target) {
    unordered_map<int, int> map;
    for (int i = 0; i < nums.size(); ++i) {
        if (map.count(target - nums[i])) return {map[target - nums[i]], i};
        map[nums[i]] = i;
    }
    return {};
}

LeetCodeAnimation (JavaScript solution for Two Sum):

var twoSum = function(nums, target) {
    const map = new Map();
    for (let i = 0; i < nums.length; i++) {
        if (map.has(target - nums[i])) return [map.get(target - nums[i]), i];
        map.set(nums[i], i);
    }
};

Both repositories offer valuable resources for LeetCode problem-solving. LeetCode provides a more extensive collection of solutions in C++, while LeetCodeAnimation offers visual aids and multi-language support. The choice between them depends on individual learning preferences and programming language requirements.

LeetCode-Go

32,894

✅ Solutions to LeetCode by Go, 100% test coverage, runtime beats 100% / LeetCode 题解

Pros of LeetCode-Go

Written in Go, offering solutions for those learning or working with Golang
More comprehensive, with solutions for 700+ LeetCode problems
Includes detailed explanations and time/space complexity analyses for each solution

Cons of LeetCode-Go

Limited to a single programming language (Go)
May be less accessible for beginners due to its focus on a less common language for coding interviews

Code Comparison

LeetCode-Go (Go):

func twoSum(nums []int, target int) []int {
    m := make(map[int]int)
    for i, num := range nums {
        if j, ok := m[target-num]; ok {
            return []int{j, i}
        }
        m[num] = i
    }
    return nil
}

LeetCode (C++):

vector<int> twoSum(vector<int>& nums, int target) {
    unordered_map<int, int> m;
    for (int i = 0; i < nums.size(); ++i) {
        if (m.count(target - nums[i]))
            return {m[target - nums[i]], i};
        m[nums[i]] = i;
    }
    return {};
}

Both implementations solve the "Two Sum" problem efficiently, but LeetCode-Go uses Go-specific syntax and features, while LeetCode uses C++. The overall logic remains similar, demonstrating the repositories' focus on their respective languages.

Leetcode

3,770

Solutions to LeetCode problems; updated daily. Subscribe to my YouTube channel for more.

Pros of Leetcode

More comprehensive coverage with 1000+ solutions
Solutions provided in multiple programming languages (Java, Python, C++)
Includes detailed explanations and time/space complexity analysis for many problems

Cons of Leetcode

Less frequent updates compared to LeetCode
Repository structure is more complex, potentially making navigation harder
Some solutions lack detailed explanations or comments

Code Comparison

LeetCode (C++):

class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        unordered_map<int, int> mapping;
        vector<int> result;
        for (int i = 0; i < nums.size(); ++i) {
            if (mapping.find(target - nums[i]) != mapping.end()) {
                result.push_back(mapping[target - nums[i]]);
                result.push_back(i);
                return result;
            }
            mapping[nums[i]] = i;
        }
        return result;
    }
};

Leetcode (Java):

public class Solution {
    public int[] twoSum(int[] nums, int target) {
        Map<Integer, Integer> map = new HashMap<>();
        for (int i = 0; i < nums.length; i++) {
            int complement = target - nums[i];
            if (map.containsKey(complement)) {
                return new int[] { map.get(complement), i };
            }
            map.put(nums[i], i);
        }
        throw new IllegalArgumentException("No two sum solution");
    }
}

Both solutions implement the Two Sum problem efficiently using hash maps, but the Leetcode solution provides implementations in multiple languages.

LeetCode-Solutions

4,672

🏋️ Python / Modern C++ Solutions of All 3283 LeetCode Problems (Weekly Update)

Pros of LeetCode-Solutions

More comprehensive coverage with solutions for 1900+ problems
Includes solutions in multiple programming languages (C++, Python, Java)
Regularly updated with new problem solutions

Cons of LeetCode-Solutions

Less detailed explanations for each solution
Code style and formatting may be less consistent across solutions

Code Comparison

LeetCode-Solutions (Python):

class Solution:
    def twoSum(self, nums: List[int], target: int) -> List[int]:
        num_map = {}
        for i, num in enumerate(nums):
            if target - num in num_map:
                return [num_map[target - num], i]
            num_map[num] = i
        return []

LeetCode (C++):

class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        unordered_map<int, int> mapping;
        vector<int> result;
        for (int i = 0; i < nums.size(); ++i) {
            if (mapping.find(target - nums[i]) != mapping.end()) {
                result.push_back(mapping[target - nums[i]]);
                result.push_back(i);
                return result;
            }
            mapping[nums[i]] = i;
        }
        return result;
    }
};

Both repositories provide solutions to LeetCode problems, but LeetCode-Solutions offers a wider range of problems and languages. However, LeetCode may provide more detailed explanations and consistent coding style. The code comparison shows similar approaches to the "Two Sum" problem, with LeetCode-Solutions using Python and LeetCode using C++.

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README

LeetCode

LeetCode solutions in C++ 11 and Python3.

NO.	Title	Solution	Note	Difficulty	Tag
0	Two Sum	C++ Python	Note	Easy	`Mapping`
1	Add Two Numbers	C++ Python	Note	Medium	`LinkedList`
2	Longest Substring Without Repeating Characters	C++ Python	Note	Medium	`Mapping`
3	Median of Two Sorted Arrays	C++ Python	Note	Hard
4	Longest Palindromic Substring	C++ Python	Note	Medium
5	ZigZag Conversion	C++ Python	Note	Medium
6	Reverse Integer	C++ Python	Note	Easy
7	String to Integer (atoi)	C++ Python	Note	Medium
8	Palindrome Number	C++ Python	Note	Easy
9	Regular Expression Matching	C++ Python	Note	Hard
10	Container With Most Water	C++ Python	Note	Medium
11	Integer to Roman	C++ Python	Note	Medium
12	Roman to Integer	C++ Python	Note	Easy
13	Longest Common Prefix	C++ Python	Note	Easy
14	3Sum	C++ Python	Note	Medium
15	3Sum Closest	C++ Python	Note	Medium
16	Letter Combinations of a Phone Number	C++ Python	Note	Medium
17	4Sum	C++ Python	Note	Medium
18	Remove Nth Node From End of List	C++ Python	Note	Medium
19	Valid Parentheses	C++ Python	Note	Easy
20	Merge Two Sorted Lists	C++ Python	Note	Easy
21	Generate Parentheses	C++ Python	Note	Medium
22	Merge k Sorted Lists	C++ Python	Note	Hard
23	Swap Nodes in Pairs	C++ Python	Note	Medium
24	Reverse Nodes in k-Group	C++ Python	Note	Hard
25	Remove Duplicates from Sorted Array	C++ Python	Note	Easy
26	Remove Element	C++ Python	Note	Easy
27	Implement strStr()	C++ Python	Note	Easy
28	Divide Two Integers	C++ Python	Note	Medium
29	Substring with Concatenation of All Words	C++ Python	Note	Hard
30	Next Permutation	C++ Python	Note	Medium
31	Longest Valid Parentheses	C++ Python	Note	Hard
32	Search in Rotated Sorted Array	C++ Python	Note	Medium
33	Search for a Range	C++ Python	Note	Medium
34	Search Insert Position	C++ Python	Note	Easy
35	Valid Sudoku	C++ Python	Note	Medium
36	Sudoku Solver	C++ Python	Note	Hard
37	Count and Say	C++ Python	Note	Easy
38	Combination Sum	C++ Python	Note	Medium
39	Combination Sum II	C++ Python	Note	Medium
40	First Missing Positive	C++ Python	Note	Hard
41	Trapping Rain Water	C++ Python	Note	Hard
42	Multiply Strings	C++ Python	Note	Medium
43	Wildcard Matching	C++ Python	Note	Hard
44	Jump Game II	C++ Python	Note	Hard
45	Permutations	C++ Python	Note	Medium
46	Permutations II	C++ Python	Note	Medium
47	Rotate Image	C++ Python	Note	Medium
48	Group Anagrams	C++ Python	Note	Medium
49	Pow(x, n)	C++ Python	Note	Medium
50	N-Queens	C++ Python	Note	Hard
51	N-Queens II	C++ Python	Note	Hard
52	Maximum Subarray	C++ Python	Note	Easy
53	Spiral Matrix	C++ Python	Note	Medium
54	Jump Game	C++ Python	Note	Medium
55	Merge Intervals	C++ Python	Note	Medium
56	Insert Interval	C++ Python	Note	Hard
57	Length of Last Word	C++ Python	Note	Easy
58	Spiral Matrix II	C++ Python	Note	Medium
59	Permutation Sequence	C++ Python	Note	Medium
60	Rotate List	C++ Python	Note	Medium
61	Unique Paths	C++ Python	Note	Medium
62	Unique Paths II	C++ Python	Note	Medium
63	Minimum Path Sum	C++ Python	Note	Medium
64	Valid Number	C++ Python	Note	Hard
65	Plus One	C++ Python	Note	Easy
66	Add Binary	C++ Python	Note	Easy
67	Text Justification	C++ Python	Note	Hard
68	Sqrt(x)	C++ Python	Note	Easy
69	Climbing Stairs	C++ Python	Note	Easy
70	Simplify Path	C++ Python	Note	Medium
71	Edit Distance	C++ Python	Note	Hard
72	Set Matrix Zeroes	C++ Python	Note	Medium
73	Search a 2D Matrix	C++ Python	Note	Medium
74	Sort Colors	C++ Python	Note	Medium
75	Minimum Window Substring	C++ Python	Note	Hard
76	Combinations	C++ Python	Note	Medium
77	Subsets	C++ Python	Note	Medium
78	Word Search	C++ Python	Note	Medium
79	Remove Duplicates from Sorted Array II	C++ Python	Note	Medium
80	Search in Rotated Sorted Array II	C++ Python	Note	Medium
81	Remove Duplicates from Sorted List II	C++ Python	Note	Medium
82	Remove Duplicates from Sorted List	C++ Python	Note	Easy
83	Largest Rectangle in Histogram	C++ Python	Note	Hard
84	Maximal Rectangle	C++ Python	Note	Hard
85	Partition List	C++ Python	Note	Medium
86	Scramble String	C++ Python	Note	Hard
87	Merge Sorted Array	C++ Python	Note	Easy
88	Gray Code	C++ Python	Note	Medium
89	Subsets II	C++ Python	Note	Medium
90	Decode Ways	C++ Python	Note	Medium
91	Reverse Linked List II	C++ Python	Note	Medium
92	Restore IP Addresses	C++ Python	Note	Medium
93	Binary Tree Inorder Traversal	C++ Python	Note	Medium
94	Unique Binary Search Trees II	C++ Python	Note	Medium
95	Unique Binary Search Trees	C++ Python	Note	Medium
96	Interleaving String	C++ Python	Note	Hard
97	Validate Binary Search Tree	C++ Python	Note	Medium
98	Recover Binary Search Tree	C++ Python	Note	Hard
99	Same Tree	C++ Python	Note	Easy
100	Symmetric Tree	C++ Python	Note	Easy
101	Binary Tree Level Order Traversal	C++ Python	Note	Medium
102	Binary Tree Zigzag Level Order Traversal	C++ Python	Note	Medium
103	Maximum Depth of Binary Tree	C++ Python	Note	Easy
104	Construct Binary Tree from Preorder and Inorder Traversal	C++ Python	Note	Medium
105	Construct Binary Tree from Inorder and Postorder Traversal	C++ Python	Note	Medium
106	Binary Tree Level Order Traversal II	C++ Python	Note	Easy
107	Convert Sorted Array to Binary Search Tree	C++ Python	Note	Easy
108	Convert Sorted List to Binary Search Tree	C++ Python	Note	Medium
109	Balanced Binary Tree	C++ Python	Note	Easy
110	Minimum Depth of Binary Tree	C++ Python	Note	Easy
111	Path Sum	C++ Python	Note	Easy
112	Path Sum II	C++ Python	Note	Medium
113	Flatten Binary Tree to Linked List	C++ Python	Note	Medium
114	Distinct Subsequences	C++ Python	Note	Hard
115	Populating Next Right Pointers in Each Node	C++ Python	Note	Medium
116	Populating Next Right Pointers in Each Node II	C++ Python	Note	Medium
117	Pascal's Triangle	C++ Python	Note	Easy
118	Pascal's Triangle II	C++ Python	Note	Easy
119	Triangle	C++ Python	Note	Medium
120	Best Time to Buy and Sell Stock	C++ Python	Note	Easy
121	Best Time to Buy and Sell Stock II	C++ Python	Note	Easy
122	Best Time to Buy and Sell Stock III	C++ Python	Note	Hard
123	Binary Tree Maximum Path Sum	C++ Python	Note	Hard
124	Valid Palindrome	C++ Python	Note	Easy
125	Word Ladder II	C++ Python	Note	Hard
126	Word Ladder	C++ Python	Note	Medium
127	Longest Consecutive Sequence	C++ Python	Note	Hard
128	Sum Root to Leaf Numbers	C++ Python	Note	Medium
129	Surrounded Regions	C++ Python	Note	Medium
130	Palindrome Partitioning	C++ Python	Note	Medium
131	Palindrome Partitioning II	C++ Python	Note	Hard
132	Clone Graph	C++ Python	Note	Medium
133	Gas Station	C++ Python	Note	Medium
134	Candy	C++ Python	Note	Hard
135	Single Number	C++ Python	Note	Easy
136	Single Number II	C++ Python	Note	Medium
137	Copy List with Random Pointer	C++ Python	Note	Medium
138	Word Break	C++ Python	Note	Medium
139	Word Break II	C++ Python	Note	Hard
140	Linked List Cycle	C++ Python	Note	Easy
141	Linked List Cycle II	C++ Python	Note	Medium
142	Reorder List	C++ Python	Note	Medium
143	Binary Tree Preorder Traversal	C++ Python	Note	Medium
144	Binary Tree Postorder Traversal	C++ Python	Note	Hard
145	LRU Cache	C++ Python	Note	Hard
146	Insertion Sort List	C++ Python	Note	Medium
147	Sort List	C++ Python	Note	Medium
148	Max Points on a Line	C++ Python	Note	Hard
149	Evaluate Reverse Polish Notation	C++ Python	Note	Medium
150	Reverse Words in a String	C++ Python	Note	Medium
151	Maximum Product Subarray	C++ Python	Note	Medium
152	Find Minimum in Rotated Sorted Array	C++ Python	Note	Medium
153	Find Minimum in Rotated Sorted Array II	C++ Python	Note	Hard
154	Min Stack	C++ Python	Note	Easy
155	Binary Tree Upside Down	C++ Python	Note	None
156	Read N Characters Given Read4	C++ Python	Note	None
157	Read N Characters Given Read4 II - Call multiple times	C++ Python	Note	None
158	Longest Substring with At Most Two Distinct Characters	C++ Python	Note	None
159	Intersection of Two Linked Lists	C++ Python	Note	Easy
160	One Edit Distance	C++ Python	Note	None
161	Find Peak Element	C++ Python	Note	Medium
162	Missing Ranges	C++ Python	Note	None
163	Maximum Gap	C++ Python	Note	Hard
164	Compare Version Numbers	C++ Python	Note	Medium
165	Fraction to Recurring Decimal	C++ Python	Note	Medium
166	Two Sum II - Input array is sorted	C++ Python	Note	Easy
167	Excel Sheet Column Title	C++ Python	Note	Easy
168	Majority Element	C++ Python	Note	Easy
169	Two Sum III - Data structure design	C++ Python	Note	None
170	Excel Sheet Column Number	C++ Python	Note	Easy
171	Factorial Trailing Zeroes	C++ Python	Note	Easy
172	Binary Search Tree Iterator	C++ Python	Note	Medium
173	Dungeon Game	C++ Python	Note	Hard
174	Combine Two Tables	C++ Python	Note	Easy
175	Second Highest Salary	C++ Python	Note	Easy
176	Nth Highest Salary	C++ Python	Note	Medium
177	Rank Scores	C++ Python	Note	Medium
178	Largest Number	C++ Python	Note	Medium
179	Consecutive Numbers	C++ Python	Note	Medium
180	Employees Earning More Than Their Managers	C++ Python	Note	Easy
181	Duplicate Emails	C++ Python	Note	Easy
182	Customers Who Never Order	C++ Python	Note	Easy
183	Department Highest Salary	C++ Python	Note	Medium
184	Department Top Three Salaries	C++ Python	Note	Hard
185	Reverse Words in a String II	C++ Python	Note	None
186	Repeated DNA Sequences	C++ Python	Note	Medium
187	Best Time to Buy and Sell Stock IV	C++ Python	Note	Hard
188	Rotate Array	C++ Python	Note	Easy
189	Reverse Bits	C++ Python	Note	Easy
190	Number of 1 Bits	C++ Python	Note	Easy
191	Word Frequency	C++ Python	Note	Medium
192	Valid Phone Numbers	C++ Python	Note	Easy
193	Transpose File	C++ Python	Note	Medium
194	Tenth Line	C++ Python	Note	Easy
195	Delete Duplicate Emails	C++ Python	Note	Easy
196	Rising Temperature	C++ Python	Note	Easy
197	House Robber	C++ Python	Note	Easy
198	Binary Tree Right Side View	C++ Python	Note	Medium
199	Number of Islands	C++ Python	Note	Medium
200	Bitwise AND of Numbers Range	C++ Python	Note	Medium
201	Happy Number	C++ Python	Note	Easy
202	Remove Linked List Elements	C++ Python	Note	Easy
203	Count Primes	C++ Python	Note	Easy
204	Isomorphic Strings	C++ Python	Note	Easy
205	Reverse Linked List	C++ Python	Note	Easy
206	Course Schedule	C++ Python	Note	Medium
207	Implement Trie (Prefix Tree)	C++ Python	Note	Medium
208	Minimum Size Subarray Sum	C++ Python	Note	Medium
209	Course Schedule II	C++ Python	Note	Medium
210	Add and Search Word - Data structure design	C++ Python	Note	Medium
211	Word Search II	C++ Python	Note	Hard
212	House Robber II	C++ Python	Note	Medium
213	Shortest Palindrome	C++ Python	Note	Hard
214	Kth Largest Element in an Array	C++ Python	Note	Medium
215	Combination Sum III	C++ Python	Note	Medium
216	Contains Duplicate	C++ Python	Note	Easy
217	The Skyline Problem	C++ Python	Note	Hard
218	Contains Duplicate II	C++ Python	Note	Easy
219	Contains Duplicate III	C++ Python	Note	Medium
220	Maximal Square	C++ Python	Note	Medium
221	Count Complete Tree Nodes	C++ Python	Note	Medium
222	Rectangle Area	C++ Python	Note	Medium
223	Basic Calculator	C++ Python	Note	Hard
224	Implement Stack using Queues	C++ Python	Note	Easy
225	Invert Binary Tree	C++ Python	Note	Easy
226	Basic Calculator II	C++ Python	Note	Medium
227	Summary Ranges	C++ Python	Note	Medium
228	Majority Element II	C++ Python	Note	Medium
229	Kth Smallest Element in a BST	C++ Python	Note	Medium
230	Power of Two	C++ Python	Note	Easy
231	Implement Queue using Stacks	C++ Python	Note	Easy
232	Number of Digit One	C++ Python	Note	Hard
233	Palindrome Linked List	C++ Python	Note	Easy
234	Lowest Common Ancestor of a Binary Search Tree	C++ Python	Note	Easy
235	Lowest Common Ancestor of a Binary Tree	C++ Python	Note	Medium
236	Delete Node in a Linked List	C++ Python	Note	Easy
237	Product of Array Except Self	C++ Python	Note	Medium
238	Sliding Window Maximum	C++ Python	Note	Hard
239	Search a 2D Matrix II	C++ Python	Note	Medium
240	Different Ways to Add Parentheses	C++ Python	Note	Medium
241	Valid Anagram	C++ Python	Note	Easy
242	Shortest Word Distance	C++ Python	Note	None
243	Shortest Word Distance II	C++ Python	Note	None
244	Shortest Word Distance III	C++ Python	Note	None
245	Strobogrammatic Number	C++ Python	Note	None
246	Strobogrammatic Number II	C++ Python	Note	None
247	Strobogrammatic Number III	C++ Python	Note	None
248	Group Shifted Strings	C++ Python	Note	None
249	Count Univalue Subtrees	C++ Python	Note	None
250	Flatten 2D Vector	C++ Python	Note	None
251	Meeting Rooms	C++ Python	Note	None
252	Meeting Rooms II	C++ Python	Note	None
253	Factor Combinations	C++ Python	Note	None
254	Verify Preorder Sequence in Binary Search Tree	C++ Python	Note	None
255	Paint House	C++ Python	Note	None
256	Binary Tree Paths	C++ Python	Note	Easy
257	Add Digits	C++ Python	Note	Easy
258	3Sum Smaller	C++ Python	Note	None
259	Single Number III	C++ Python	Note	Medium
260	Graph Valid Tree	C++ Python	Note	None
261	Trips and Users	C++ Python	Note	Hard
262	Ugly Number	C++ Python	Note	Easy
263	Ugly Number II	C++ Python	Note	Medium
264	Paint House II	C++ Python	Note	None
265	Palindrome Permutation	C++ Python	Note	None
266	Palindrome Permutation II	C++ Python	Note	None
267	Missing Number	C++ Python	Note	Easy
268	Alien Dictionary	C++ Python	Note	None
269	Closest Binary Search Tree Value	C++ Python	Note	None
270	Encode and Decode Strings	C++ Python	Note	None
271	Closest Binary Search Tree Value II	C++ Python	Note	None
272	Integer to English Words	C++ Python	Note	Hard
273	H-Index	C++ Python	Note	Medium
274	H-Index II	C++ Python	Note	Medium
275	Paint Fence	C++ Python	Note	None
276	Find the Celebrity	C++ Python	Note	None
277	First Bad Version	C++ Python	Note	Easy
278	Perfect Squares	C++ Python	Note	Medium
279	Wiggle Sort	C++ Python	Note	None
280	Zigzag Iterator	C++ Python	Note	None
281	Expression Add Operators	C++ Python	Note	Hard
282	Move Zeroes	C++ Python	Note	Easy
283	Peeking Iterator	C++ Python	Note	Medium
284	Inorder Successor in BST	C++ Python	Note	None
285	Walls and Gates	C++ Python	Note	None
286	Find the Duplicate Number	C++ Python	Note	Medium
287	Unique Word Abbreviation	C++ Python	Note	None
288	Game of Life	C++ Python	Note	Medium
289	Word Pattern	C++ Python	Note	Easy
290	Word Pattern II	C++ Python	Note	None
291	Nim Game	C++ Python	Note	Easy
292	Flip Game	C++ Python	Note	None
293	Flip Game II	C++ Python	Note	None
294	Find Median from Data Stream	C++ Python	Note	Hard
295	Best Meeting Point	C++ Python	Note	None
296	Serialize and Deserialize Binary Tree	C++ Python	Note	Hard
297	Binary Tree Longest Consecutive Sequence	C++ Python	Note	None
298	Bulls and Cows	C++ Python	Note	Medium
299	Longest Increasing Subsequence	C++ Python	Note	Medium
300	Remove Invalid Parentheses	C++ Python	Note	Hard
301	Smallest Rectangle Enclosing Black Pixels	C++ Python	Note	None
302	Range Sum Query - Immutable	C++ Python	Note	Easy
303	Range Sum Query 2D - Immutable	C++ Python	Note	Medium
304	Number of Islands II	C++ Python	Note	None
305	Additive Number	C++ Python	Note	Medium
306	Range Sum Query - Mutable	C++ Python	Note	Medium
307	Range Sum Query 2D - Mutable	C++ Python	Note	None
308	Best Time to Buy and Sell Stock with Cooldown	C++ Python	Note	Medium
309	Minimum Height Trees	C++ Python	Note	Medium
310	Sparse Matrix Multiplication	C++ Python	Note	None
311	Burst Balloons	C++ Python	Note	Hard
312	Super Ugly Number	C++ Python	Note	Medium
313	Binary Tree Vertical Order Traversal	C++ Python	Note	None
314	Count of Smaller Numbers After Self	C++ Python	Note	Hard
315	Remove Duplicate Letters	C++ Python	Note	Hard
316	Shortest Distance from All Buildings	C++ Python	Note	None
317	Maximum Product of Word Lengths	C++ Python	Note	Medium
318	Bulb Switcher	C++ Python	Note	Medium
319	Generalized Abbreviation	C++ Python	Note	None
320	Create Maximum Number	C++ Python	Note	Hard
321	Coin Change	C++ Python	Note	Medium
322	Number of Connected Components in an Undirected Graph	C++ Python	Note	None
323	Wiggle Sort II	C++ Python	Note	Medium
324	Maximum Size Subarray Sum Equals k	C++ Python	Note	None
325	Power of Three	C++ Python	Note	Easy
326	Count of Range Sum	C++ Python	Note	Hard
327	Odd Even Linked List	C++ Python	Note	Medium
328	Longest Increasing Path in a Matrix	C++ Python	Note	Hard
329	Patching Array	C++ Python	Note	Hard
330	Verify Preorder Serialization of a Binary Tree	C++ Python	Note	Medium
331	Reconstruct Itinerary	C++ Python	Note	Medium
332	Largest BST Subtree	C++ Python	Note	None
333	Increasing Triplet Subsequence	C++ Python	Note	Medium
334	Self Crossing	C++ Python	Note	Hard
335	Palindrome Pairs	C++ Python	Note	Hard
336	House Robber III	C++ Python	Note	Medium
337	Counting Bits	C++ Python	Note	Medium
338	Nested List Weight Sum	C++ Python	Note	None
339	Longest Substring with At Most K Distinct Characters	C++ Python	Note	None
340	Flatten Nested List Iterator	C++ Python	Note	Medium
341	Power of Four	C++ Python	Note	Easy
342	Integer Break	C++ Python	Note	Medium
343	Reverse String	C++ Python	Note	Easy
344	Reverse Vowels of a String	C++ Python	Note	Easy
345	Moving Average from Data Stream	C++ Python	Note	None
346	Top K Frequent Elements	C++ Python	Note	Medium
347	Design Tic-Tac-Toe	C++ Python	Note	None
348	Intersection of Two Arrays	C++ Python	Note	Easy
349	Intersection of Two Arrays II	C++ Python	Note	Easy
350	Android Unlock Patterns	C++ Python	Note	None
351	Data Stream as Disjoint Intervals	C++ Python	Note	Hard
352	Design Snake Game	C++ Python	Note	None
353	Russian Doll Envelopes	C++ Python	Note	Hard
354	Design Twitter	C++ Python	Note	Medium
355	Line Reflection	C++ Python	Note	None
356	Count Numbers with Unique Digits	C++ Python	Note	Medium
357	Rearrange String k Distance Apart	C++ Python	Note	None
358	Logger Rate Limiter	C++ Python	Note	None
359	Sort Transformed Array	C++ Python	Note	None
360	Bomb Enemy	C++ Python	Note	None
361	Design Hit Counter	C++ Python	Note	None
362	Max Sum of Rectangle No Larger Than K	C++ Python	Note	Hard
363	Nested List Weight Sum II	C++ Python	Note	None
364	Water and Jug Problem	C++ Python	Note	Medium
365	Find Leaves of Binary Tree	C++ Python	Note	None
366	Valid Perfect Square	C++ Python	Note	Easy
367	Largest Divisible Subset	C++ Python	Note	Medium
368	Plus One Linked List	C++ Python	Note	None
369	Range Addition	C++ Python	Note	None
370	Sum of Two Integers	C++ Python	Note	Easy
371	Super Pow	C++ Python	Note	Medium
372	Find K Pairs with Smallest Sums	C++ Python	Note	Medium
373	Guess Number Higher or Lower	C++ Python	Note	Easy
374	Guess Number Higher or Lower II	C++ Python	Note	Medium
375	Wiggle Subsequence	C++ Python	Note	Medium
376	Combination Sum IV	C++ Python	Note	Medium
377	Kth Smallest Element in a Sorted Matrix	C++ Python	Note	Medium
378	Design Phone Directory	C++ Python	Note	None
379	Insert Delete GetRandom O(1)	C++ Python	Note	Medium
380	Insert Delete GetRandom O(1) - Duplicates allowed	C++ Python	Note	Hard
381	Linked List Random Node	C++ Python	Note	Medium
382	Ransom Note	C++ Python	Note	Easy
383	Shuffle an Array	C++ Python	Note	Medium
384	Mini Parser	C++ Python	Note	Medium
385	Lexicographical Numbers	C++ Python	Note	Medium
386	First Unique Character in a String	C++ Python	Note	Easy
387	Longest Absolute File Path	C++ Python	Note	Medium
388	Find the Difference	C++ Python	Note	Easy
389	Elimination Game	C++ Python	Note	Medium
390	Perfect Rectangle	C++ Python	Note	Hard
391	Is Subsequence	C++ Python	Note	Medium
392	UTF-8 Validation	C++ Python	Note	Medium
393	Decode String	C++ Python	Note	Medium
394	Longest Substring with At Least K Repeating Characters	C++ Python	Note	Medium
395	Rotate Function	C++ Python	Note	Medium
396	Integer Replacement	C++ Python	Note	Medium
397	Random Pick Index	C++ Python	Note	Medium
398	Evaluate Division	C++ Python	Note	Medium
399	Nth Digit	C++ Python	Note	Easy
400	Binary Watch	C++ Python	Note	Easy
401	Remove K Digits	C++ Python	Note	Medium
402	Frog Jump	C++ Python	Note	Hard
403	Sum of Left Leaves	C++ Python	Note	Easy
404	Convert a Number to Hexadecimal	C++ Python	Note	Easy
405	Queue Reconstruction by Height	C++ Python	Note	Medium
406	Trapping Rain Water II	C++ Python	Note	Hard
407	Valid Word Abbreviation	C++ Python	Note	None
408	Longest Palindrome	C++ Python	Note	Easy
409	Split Array Largest Sum	C++ Python	Note	Hard
410	Minimum Unique Word Abbreviation	C++ Python	Note	None
411	Fizz Buzz	C++ Python	Note	Easy
412	Arithmetic Slices	C++ Python	Note	Medium
413	Third Maximum Number	C++ Python	Note	Easy
414	Add Strings	C++ Python	Note	Easy
415	Partition Equal Subset Sum	C++ Python	Note	Medium
416	Pacific Atlantic Water Flow	C++ Python	Note	Medium
417	Sentence Screen Fitting	C++ Python	Note	None
418	Battleships in a Board	C++ Python	Note	Medium
419	Strong Password Checker	C++ Python	Note	Hard
420	Maximum XOR of Two Numbers in an Array	C++ Python	Note	Medium
421	Valid Word Square	C++ Python	Note	None
422	Reconstruct Original Digits from English	C++ Python	Note	Medium
423	Longest Repeating Character Replacement	C++ Python	Note	Medium
424	Word Squares	C++ Python	Note	None
425	All O'one Data Structure	C++ Python	Note	Hard
426	Minimum Genetic Mutation	C++ Python	Note	Medium
427	Number of Segments in a String	C++ Python	Note	Easy
428	Non-overlapping Intervals	C++ Python	Note	Medium
429	Find Right Interval	C++ Python	Note	Medium
430	Path Sum III	C++ Python	Note	Easy
431	Find All Anagrams in a String	C++ Python	Note	Easy
432	Ternary Expression Parser	C++ Python	Note	None
433	K-th Smallest in Lexicographical Order	C++ Python	Note	Hard
434	Arranging Coins	C++ Python	Note	Easy
435	Find All Duplicates in an Array	C++ Python	Note	Medium
436	String Compression	C++ Python	Note	Easy
437	Sequence Reconstruction	C++ Python	Note	None
438	Add Two Numbers II	C++ Python	Note	Medium
439	Arithmetic Slices II - Subsequence	C++ Python	Note	Hard
440	Number of Boomerangs	C++ Python	Note	Easy
441	Find All Numbers Disappeared in an Array	C++ Python	Note	Easy
442	Serialize and Deserialize BST	C++ Python	Note	Medium
443	Delete Node in a BST	C++ Python	Note	Medium
444	Sort Characters By Frequency	C++ Python	Note	Medium
445	Minimum Number of Arrows to Burst Balloons	C++ Python	Note	Medium
446	Minimum Moves to Equal Array Elements	C++ Python	Note	Easy
447	4Sum II	C++ Python	Note	Medium
448	Assign Cookies	C++ Python	Note	Easy
449	132 Pattern	C++ Python	Note	Medium
450	Circular Array Loop	C++ Python	Note	Medium
451	Poor Pigs	C++ Python	Note	Easy
452	Repeated Substring Pattern	C++ Python	Note	Easy
453	LFU Cache	C++ Python	Note	Hard
454	Hamming Distance	C++ Python	Note	Easy
455	Minimum Moves to Equal Array Elements II	C++ Python	Note	Medium
456	Island Perimeter	C++ Python	Note	Easy
457	Can I Win	C++ Python	Note	Medium
458	Optimal Account Balancing	C++ Python	Note	None
459	Count The Repetitions	C++ Python	Note	Hard
460	Unique Substrings in Wraparound String	C++ Python	Note	Medium
461	Validate IP Address	C++ Python	Note	Medium
462	Convex Polygon	C++ Python	Note	None
463	Encode String with Shortest Length	C++ Python	Note	None
464	Concatenated Words	C++ Python	Note	Hard
465	Matchsticks to Square	C++ Python	Note	Medium
466	Ones and Zeroes	C++ Python	Note	Medium
467	Heaters	C++ Python	Note	Easy
468	Number Complement	C++ Python	Note	Easy
469	Total Hamming Distance	C++ Python	Note	Medium
470	Largest Palindrome Product	C++ Python	Note	Easy
471	Sliding Window Median	C++ Python	Note	Hard
472	Magical String	C++ Python	Note	Medium
473	License Key Formatting	C++ Python	Note	Easy
474	Smallest Good Base	C++ Python	Note	Hard
475	Find Permutation	C++ Python	Note	None
476	Max Consecutive Ones	C++ Python	Note	Easy
477	Predict the Winner	C++ Python	Note	Medium
478	Max Consecutive Ones II	C++ Python	Note	None
479	Zuma Game	C++ Python	Note	Hard
480	The Maze	C++ Python	Note	None
481	Increasing Subsequences	C++ Python	Note	Medium
482	Construct the Rectangle	C++ Python	Note	Easy
483	Reverse Pairs	C++ Python	Note	Hard
484	Target Sum	C++ Python	Note	Medium
485	Teemo Attacking	C++ Python	Note	Medium
486	Next Greater Element I	C++ Python	Note	Easy
487	Diagonal Traverse	C++ Python	Note	Medium
488	The Maze III	C++ Python	Note	None
489	Keyboard Row	C++ Python	Note	Easy
490	Find Mode in Binary Search Tree	C++ Python	Note	Easy
491	IPO	C++ Python	Note	Hard
492	Next Greater Element II	C++ Python	Note	Medium
493	Base 7	C++ Python	Note	Easy
494	The Maze II	C++ Python	Note	None
495	Relative Ranks	C++ Python	Note	Easy
496	Perfect Number	C++ Python	Note	Easy
497	Most Frequent Subtree Sum	C++ Python	Note	Medium
498	Find Bottom Left Tree Value	C++ Python	Note	Medium
499	Freedom Trail	C++ Python	Note	Hard
500	Find Largest Value in Each Tree Row	C++ Python	Note	Medium
501	Longest Palindromic Subsequence	C++ Python	Note	Medium
502	Super Washing Machines	C++ Python	Note	Hard
503	Coin Change 2	C++ Python	Note	Medium
504	Detect Capital	C++ Python	Note	Easy
505	Longest Uncommon Subsequence I	C++ Python	Note	Easy
506	Longest Uncommon Subsequence II	C++ Python	Note	Medium
507	Continuous Subarray Sum	C++ Python	Note	Medium
508	Longest Word in Dictionary through Deleting	C++ Python	Note	Medium
509	Contiguous Array	C++ Python	Note	Medium
510	Beautiful Arrangement	C++ Python	Note	Medium
511	Word Abbreviation	C++ Python	Note	None
512	Minesweeper	C++ Python	Note	Medium
513	Minimum Absolute Difference in BST	C++ Python	Note	Easy
514	Lonely Pixel I	C++ Python	Note	None
515	K-diff Pairs in an Array	C++ Python	Note	Easy
516	Lonely Pixel II	C++ Python	Note	None
517	Design TinyURL	C++ Python	Note	Medium
518	Encode and Decode TinyURL	C++ Python	Note	Medium
519	Construct Binary Tree from String	C++ Python	Note	None
520	Complex Number Multiplication	C++ Python	Note	Medium
521	Convert BST to Greater Tree	C++ Python	Note	Easy
522	Minimum Time Difference	C++ Python	Note	Medium
523	Single Element in a Sorted Array	C++ Python	Note	Medium
524	Reverse String II	C++ Python	Note	Easy
525	01 Matrix	C++ Python	Note	Medium
526	Diameter of Binary Tree	C++ Python	Note	Easy
527	Output Contest Matches	C++ Python	Note	None
528	Boundary of Binary Tree	C++ Python	Note	None
529	Remove Boxes	C++ Python	Note	Hard
530	Friend Circles	C++ Python	Note	Medium
531	Split Array with Equal Sum	C++ Python	Note	None
532	Binary Tree Longest Consecutive Sequence II	C++ Python	Note	None
533	Student Attendance Record I	C++ Python	Note	Easy
534	Student Attendance Record II	C++ Python	Note	Hard
535	Optimal Division	C++ Python	Note	Medium
536	Brick Wall	C++ Python	Note	Medium
537	Split Concatenated Strings	C++ Python	Note	None
538	Next Greater Element III	C++ Python	Note	Medium
539	Reverse Words in a String III	C++ Python	Note	Easy
540	Subarray Sum Equals K	C++ Python	Note	Medium
541	Array Partition I	C++ Python	Note	Easy
542	Longest Line of Consecutive One in Matrix	C++ Python	Note	None
543	Binary Tree Tilt	C++ Python	Note	Easy
544	Find the Closest Palindrome	C++ Python	Note	Hard
545	Array Nesting	C++ Python	Note	Medium
546	Reshape the Matrix	C++ Python	Note	Easy
547	Permutation in String	C++ Python	Note	Medium
548	Maximum Vacation Days	C++ Python	Note	None
549	Median Employee Salary	C++ Python	Note	None
550	Managers with at Least 5 Direct Reports	C++ Python	Note	None
551	Find Median Given Frequency of Numbers	C++ Python	Note	None
552	Subtree of Another Tree	C++ Python	Note	Easy
553	Squirrel Simulation	C++ Python	Note	None
554	Winning Candidate	C++ Python	Note	None
555	Distribute Candies	C++ Python	Note	Easy
556	Out of Boundary Paths	C++ Python	Note	Medium
557	Employee Bonus	C++ Python	Note	None
558	Get Highest Answer Rate Question	C++ Python	Note	None
559	Find Cumulative Salary of an Employee	C++ Python	Note	None
560	Count Student Number in Departments	C++ Python	Note	None
561	Shortest Unsorted Continuous Subarray	C++ Python	Note	Easy
562	Kill Process	C++ Python	Note	None
563	Delete Operation for Two Strings	C++ Python	Note	Medium
564	Find Customer Referee	C++ Python	Note	None
565	Investments in 2016	C++ Python	Note	None
566	Customer Placing the Largest Number of Orders	C++ Python	Note	None
567	Erect the Fence	C++ Python	Note	Hard
568	Design In-Memory File System	C++ Python	Note	None
569	Tag Validator	C++ Python	Note	Hard
570	Fraction Addition and Subtraction	C++ Python	Note	Medium
571	Valid Square	C++ Python	Note	Medium
572	Longest Harmonious Subsequence	C++ Python	Note	Easy
573	Big Countries	C++ Python	Note	Easy
574	Classes More Than 5 Students	C++ Python	Note	Easy
575	Friend Requests I: Overall Acceptance Rate	C++ Python	Note	None
576	Range Addition II	C++ Python	Note	Easy
577	Minimum Index Sum of Two Lists	C++ Python	Note	Easy
578	Non-negative Integers without Consecutive Ones	C++ Python	Note	Hard
579	Human Traffic of Stadium	C++ Python	Note	Hard
580	Friend Requests II: Who Has the Most Friends	C++ Python	Note	None
581	Consecutive Available Seats	C++ Python	Note	None
582	Design Compressed String Iterator	C++ Python	Note	None
583	Can Place Flowers	C++ Python	Note	Easy
584	Construct String from Binary Tree	C++ Python	Note	Easy
585	Sales Person	C++ Python	Note	None
586	Tree Node	C++ Python	Note	None
587	Find Duplicate File in System	C++ Python	Note	Medium
588	Triangle Judgement	C++ Python	Note	None
589	Valid Triangle Number	C++ Python	Note	Medium
590	Shortest Distance in a Plane	C++ Python	Note	None
591	Shortest Distance in a Line	C++ Python	Note	None
592	Second Degree Follower	C++ Python	Note	None
593	Average Salary: Departments VS Company	C++ Python	Note	None
594	Add Bold Tag in String	C++ Python	Note	None
595	Merge Two Binary Trees	C++ Python	Note	Easy
596	Students Report By Geography	C++ Python	Note	None
597	Biggest Single Number	C++ Python	Note	None
598	Not Boring Movies	C++ Python	Note	Easy
599	Task Scheduler	C++ Python	Note	Medium
600	Add One Row to Tree	C++ Python	Note	Medium
601	Maximum Distance in Arrays	C++ Python	Note	None
602	Minimum Factorization	C++ Python	Note	None
603	Exchange Seats	C++ Python	Note	Medium
604	Swap Salary	C++ Python	Note	Easy
605	Maximum Product of Three Numbers	C++ Python	Note	Easy
606	K Inverse Pairs Array	C++ Python	Note	Hard
607	Course Schedule III	C++ Python	Note	Hard
608	Design Excel Sum Formula	C++ Python	Note	None
609	Smallest Range	C++ Python	Note	Hard
610	Sum of Square Numbers	C++ Python	Note	Easy
611	Find the Derangement of An Array	C++ Python	Note	None
612	Design Log Storage System	C++ Python	Note	None
613	Exclusive Time of Functions	C++ Python	Note	Medium
614	Average of Levels in Binary Tree	C++ Python	Note	Easy
615	Shopping Offers	C++ Python	Note	Medium
616	Decode Ways II	C++ Python	Note	Hard
617	Solve the Equation	C++ Python	Note	Medium
618	Design Search Autocomplete System	C++ Python	Note	None
619	Maximum Average Subarray I	C++ Python	Note	Easy
620	Maximum Average Subarray II	C++ Python	Note	None
621	Set Mismatch	C++ Python	Note	Easy
622	Maximum Length of Pair Chain	C++ Python	Note	Medium
623	Palindromic Substrings	C++ Python	Note	Medium
624	Replace Words	C++ Python	Note	Medium
625	Dota2 Senate	C++ Python	Note	Medium
626	2 Keys Keyboard	C++ Python	Note	Medium
627	4 Keys Keyboard	C++ Python	Note	None
628	Find Duplicate Subtrees	C++ Python	Note	Medium
629	Two Sum IV - Input is a BST	C++ Python	Note	Easy
630	Maximum Binary Tree	C++ Python	Note	Medium
631	Print Binary Tree	C++ Python	Note	Medium
632	Coin Path	C++ Python	Note	None
633	Judge Route Circle	C++ Python	Note	Easy
634	Find K Closest Elements	C++ Python	Note	Medium
635	Split Array into Consecutive Subsequences	C++ Python	Note	Medium
636	Remove 9	C++ Python	Note	None
637	Image Smoother	C++ Python	Note	Easy
638	Maximum Width of Binary Tree	C++ Python	Note	Medium
639	Equal Tree Partition	C++ Python	Note	None
640	Strange Printer	C++ Python	Note	Hard
641	Non-decreasing Array	C++ Python	Note	Easy
642	Path Sum IV	C++ Python	Note	None
643	Beautiful Arrangement II	C++ Python	Note	Medium
644	Kth Smallest Number in Multiplication Table	C++ Python	Note	Hard
645	Trim a Binary Search Tree	C++ Python	Note	Easy
646	Maximum Swap	C++ Python	Note	Medium
647	Second Minimum Node In a Binary Tree	C++ Python	Note	Easy
648	Bulb Switcher II	C++ Python	Note	Medium
649	Number of Longest Increasing Subsequence	C++ Python	Note	Medium
650	Longest Continuous Increasing Subsequence	C++ Python	Note	Easy
651	Cut Off Trees for Golf Event	C++ Python	Note	Hard
652	Implement Magic Dictionary	C++ Python	Note	Medium
653	Map Sum Pairs	C++ Python	Note	Medium
654	Valid Parenthesis String	C++ Python	Note	Medium
655	24 Game	C++ Python	Note	Hard
656	Valid Palindrome II	C++ Python	Note	Easy
657	Next Closest Time	C++ Python	Note	None
658	Baseball Game	C++ Python	Note	Easy
659	K Empty Slots	C++ Python	Note	None
660	Redundant Connection	C++ Python	Note	Medium
661	Redundant Connection II	C++ Python	Note	Hard
662	Repeated String Match	C++ Python	Note	Easy
663	Longest Univalue Path	C++ Python	Note	Easy
664	Knight Probability in Chessboard	C++ Python	Note	Medium
665	Maximum Sum of 3 Non-Overlapping Subarrays	C++ Python	Note	Hard
666	Employee Importance	C++ Python	Note	Easy
667	Stickers to Spell Word	C++ Python	Note	Hard
668	Top K Frequent Words	C++ Python	Note	Medium
669	Binary Number with Alternating Bits	C++ Python	Note	Easy
670	Number of Distinct Islands	C++ Python	Note	None
671	Max Area of Island	C++ Python	Note	Easy
672	Count Binary Substrings	C++ Python	Note	Easy
673	Degree of an Array	C++ Python	Note	Easy
674	Partition to K Equal Sum Subsets	C++ Python	Note	Medium
675	Falling Squares	C++ Python	Note	Hard
676	Number of Distinct Islands II	C++ Python	Note	None
677	Minimum ASCII Delete Sum for Two Strings	C++ Python	Note	Medium
678	Subarray Product Less Than K	C++ Python	Note	Medium
679	Best Time to Buy and Sell Stock with Transaction Fee	C++ Python	Note	Medium
680	Range Module	C++ Python	Note	Hard
681	Max Stack	C++ Python	Note	None
682	1-bit and 2-bit Characters	C++ Python	Note	Easy
683	Maximum Length of Repeated Subarray	C++ Python	Note	Medium
684	Find K-th Smallest Pair Distance	C++ Python	Note	Hard
685	Longest Word in Dictionary	C++ Python	Note	Easy
686	Accounts Merge	C++ Python	Note	Medium
687	Remove Comments	C++ Python	Note	Medium
688	Candy Crush	C++ Python	Note	None
689	Find Pivot Index	C++ Python	Note	Easy
690	Split Linked List in Parts	C++ Python	Note	Medium
691	Number of Atoms	C++ Python	Note	Hard
692	Minimum Window Subsequence	C++ Python	Note	None
693	Self Dividing Numbers	C++ Python	Note	Easy
694	My Calendar I	C++ Python	Note	Medium
695	Count Different Palindromic Subsequences	C++ Python	Note	Hard
696	My Calendar II	C++ Python	Note	Medium
697	My Calendar III	C++ Python	Note	Hard
698	Flood Fill	C++ Python	Note	Easy
699	Sentence Similarity	C++ Python	Note	Easy
700	Asteroid Collision	C++ Python	Note	Medium
701	Parse Lisp Expression	C++ Python	Note	Hard
702	Sentence Similarity II	C++ Python	Note	Medium
703	Monotone Increasing Digits	C++ Python	Note	Medium
704	Daily Temperatures	C++ Python	Note	Medium
705	Delete and Earn	C++ Python	Note	Medium
706	Cherry Pickup	C++ Python	Note	Hard
707	Closest Leaf in a Binary Tree	C++ Python	Note	New
708	Network Delay Time	C++ Python	Note	New
709	Find Smallest Letter Greater Than Target	C++ Python	Note	New
710	Prefix and Suffix Search	C++ Python	Note	New

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