The fishercoder1534/Leetcode repository is a comprehensive collection of LeetCode problem solutions implemented in Java. It serves as a valuable resource for developers preparing for technical interviews or looking to improve their algorithmic problem-solving skills. The repository contains well-organized and commented solutions for a wide range of LeetCode problems.

Pros

• Extensive coverage of LeetCode problems with Java solutions
• Well-organized structure with clear problem categorization
• Detailed comments and explanations for each solution
• Regular updates and contributions from the community

Cons

• Primarily focused on Java, limiting language diversity
• Some solutions may not be optimized for performance
• Lack of comprehensive test cases for each problem
• May encourage over-reliance on solutions instead of independent problem-solving

Code Examples

1. Two Sum problem 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");
}

This code solves the Two Sum problem using a HashMap to efficiently find the complement of each number.

2. Reverse Linked List solution:

public ListNode reverseList(ListNode head) {
    ListNode prev = null;
    ListNode curr = head;
    while (curr != null) {
        ListNode nextTemp = curr.next;
        curr.next = prev;
        prev = curr;
        curr = nextTemp;
    }
    return prev;
}

This code reverses a singly linked list iteratively by changing the next pointers of each node.

3. Binary Tree Inorder Traversal solution:

public List<Integer> inorderTraversal(TreeNode root) {
    List<Integer> result = new ArrayList<>();
    inorderHelper(root, result);
    return result;
}

private void inorderHelper(TreeNode node, List<Integer> result) {
    if (node != null) {
        inorderHelper(node.left, result);
        result.add(node.val);
        inorderHelper(node.right, result);
    }
}

This code performs an inorder traversal of a binary tree recursively, adding node values to a list.

Getting Started

To use the solutions in this repository:

1. Clone the repository:

   git clone https://github.com/fishercoder1534/Leetcode.git
   

2. Navigate to the desired problem solution in the appropriate package.

3. Copy the solution code and adapt it to your needs or use it as a reference for solving similar problems.

4. Make sure to understand the solution thoroughly before using it in interviews or coding assessments.