Challenges Leetcode leetcode https://leetcode.com/ Study plan leetcode-75: https://leetcode.com/studyplan/leetcode-75/ top-interview-150: https://leetcode.com/studyplan/top-interview-150/ top-100-liked: https://leetcode.com/studyplan/top-100-liked/ Cheatsheet LeetCode Cheatsheet Common problems Common problems 15 Leetcode Patterns https://blog.algomaster.io/p/15-leetcode-patterns