I Solved 800+ LeetCode Problems in C# - Here's What I Built

What's on the site Every solution page has: ✅ Clean, readable C# code with syntax highlighting 📝 The approach explained in plain English ⏱️ Time and space complexity 🔗 Direct link to the LeetCode problem You can browse by topic (Dynamic Programming, Trees, Graphs, Sliding Window, Two Pointers, and 40+ more) or filter by difficulty (Easy / Medium / Hard). Example — Two Sum Here's what a typical solution looks like: // Approach: Use a dictionary to store each number's index. // For each number, check if its complement (target - num) already exists. // Time: O(n) Space: O(n) public class Solution { public int[] TwoSum(int[] nums, int target) { var map = new Dictionary<int, int>(); for (int i = 0; i < nums.Length; i++) { int complement = target - nums[i]; if (map.ContainsKey(complement)) return new int[] { map[complement], i }; map[nums[i]] = i; } return Array.Empty<int>(); } } Every solution follows this pattern — the comment at the top explains the core idea before you r