Array

• Majority Element Easy
• Repeat & missing number Easy
• Merge 2 sorted array Easy
• Single Number Easy
• Stock Buy & Sell Easy
• Compute Pow X^N Medium
• Kadane's Algorithm Medium
• Search in 2d matrix Medium
• Container with most water Medium
• Sortr array of 0s, 1s & 2s Medium
• 3 Sum Medium
• 4 Sum Medium
• Next Permutation Medium
• Merge Overlapping Intervals Medium
• Longest Substring Without Repeating Medium
• Set Matrix Zeroes Medium
• Word Search Medium
• Product of Array except Self Medium
• Subarray sum equals K Medium
• Find Duplicate Medium
• Spiral Matrix Medium
• Search in Sorted Matrix II Medium
• Count Inversions Hard
• Trapping Rainwater Hard
• Sliding Window Maximum Hard
• Reverse Pairs Hard
• Largest Rectangle in a Histogram Hard

Strings

• Valid Palindrome Easy
• Valid Anagram Easy
• Reverse Words in String Medium
• Remove All Occurrences Medium
• Permutation in String Medium
• String Compression Medium
• Reverse Words in String Medium
• Group Anagrams Medium
• Minimum Window Substring Hard
• KMP algorithm Hard

Linked List

• Reverse Linked List Easy
• Linked List Cycle Easy
• Merge k Sorted Lists Hard