Leetcode Grind 75 Problems

Array

Easy

• 1. Two Sum
• 217. Contains Duplicate
• 704. Binary Search
• 169. Majority Element

Medium

• 11. Container With Most Water
• 15. 3Sum
• 238. Product of Array Except Self
• 53. Maximum Subarray
• 33. Search in Rotated Sorted Array

Hard

• 42. Trapping Rain Water

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String

Easy

• 20. Valid Parentheses
• 125. Valid Palindrome
• 409. Longest Palindrome

Medium

• 3. Longest Substring Without Repeating Characters
• 5. Longest Palindromic Substring
• 8. String to Integer (atoi)
• 76. Minimum Window Substring
• 139. Word Break

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Linked List

Easy

• 21. Merge Two Sorted Lists
• 141. Linked List Cycle
• 876. Middle of the Linked List

Medium

• 23. Merge k Sorted Lists
• 19. Remove Nth Node From End of List

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Tree

Easy

• 100. Same Tree
• 104. Maximum Depth of Binary Tree
• 110. Balanced Binary Tree

Medium

• 102. Binary Tree Level Order Traversal
• 230. Kth Smallest Element in a BST

Hard

• 297. Serialize and Deserialize Binary Tree

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Dynamic Programming

Easy

• 70. Climbing Stairs

Medium

• 322. Coin Change
• 91. Decode Ways

Hard

• 312. Burst Balloons

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Graph

Medium

• 133. Clone Graph
• 200. Number of Islands

Hard

• 295. Find Median from Data Stream

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Matrix

Medium

• 54. Spiral Matrix

Hard

• 84. Largest Rectangle in Histogram

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Miscellaneous

Easy

• 278. First Bad Version
• 67. Add Binary
• 121. Best Time to Buy and Sell Stock

Medium

• 146. LRU Cache
• 16. 3Sum Closest
• 17. Letter Combinations of a Phone Number
• 56. Merge Intervals

Hard

• 1235. Maximum Profit in Job Scheduling

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This filtered list of problems is designed to help you focus on topics you may want to improve on. Keep grinding and challenge yourself with different difficulty levels!