Grind 75

Updated version of Blind 75 by the same author (Yangshun Tay). A better, more balanced set of 75 problems across all key topics.

Azhar Khan75 problems21 Easy43 Med9 Hard

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Hard

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Title	Solution	Practice	Difficulty	Companies	Topics
224. Basic Calculator	Solution	Solve	Hard	-	Math Recursion+2
295. Find Median from Data Stream	Solution	Solve	Hard	-	Data Stream Design+3
278. First Bad Version	Solution	Solve	Easy	-	Binary Search Interactive
242. Valid Anagram	Solution	Solve	Easy	-	Hash Table Sorting+1
238. Product of Array Except Self	Solution	Solve	Medium	-	Array Prefix Sum
236. Lowest Common Ancestor of a Binary Tree	Solution	Solve	Medium	-	Binary Tree Depth-First Search+1
235. Lowest Common Ancestor of a Binary Search Tree	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+2
232. Implement Queue using Stacks	Solution	Solve	Easy	-	Design Queue+1
230. Kth Smallest Element in a BST	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+2
226. Invert Binary Tree	Solution	Solve	Easy	-	Binary Tree Breadth-First Search+2
297. Serialize and Deserialize Binary Tree	Solution	Solve	Hard	-	Binary Tree Breadth-First Search+4
217. Contains Duplicate	Solution	Solve	Easy	-	Array Hash Table+1
208. Implement Trie (Prefix Tree)	Solution	Solve	Medium	-	Design Hash Table+2
207. Course Schedule	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
206. Reverse Linked List	Solution	Solve	Easy	-	Linked List Recursion
200. Number of Islands	Solution	Solve	Medium	-	Array Breadth-First Search+3
199. Binary Tree Right Side View	Solution	Solve	Medium	-	Binary Tree Breadth-First Search+2
155. Min Stack	Solution	Solve	Medium	-	Design Stack
150. Evaluate Reverse Polish Notation	Solution	Solve	Medium	-	Array Math+1
621. Task Scheduler	Solution	Solve	Medium	-	Array Counting+4
1235. Maximum Profit in Job Scheduling	Solution	Solve	Hard	-	Array Binary Search+2
994. Rotting Oranges	Solution	Solve	Medium	-	Array Breadth-First Search+1
981. Time Based Key-Value Store	Solution	Solve	Medium	-	Binary Search Design+2
973. K Closest Points to Origin	Solution	Solve	Medium	-	Array Divide and Conquer+5
876. Middle of the Linked List	Solution	Solve	Easy	-	Linked List Two Pointers
733. Flood Fill	Solution	Solve	Easy	-	Array Breadth-First Search+2
721. Accounts Merge	Solution	Solve	Medium	-	Array Breadth-First Search+5
704. Binary Search	Solution	Solve	Easy	-	Array Binary Search
146. LRU Cache	Solution	Solve	Medium	-	Design Doubly-Linked List+2
543. Diameter of Binary Tree	Solution	Solve	Easy	-	Binary Tree Depth-First Search+1
542. 01 Matrix	Solution	Solve	Medium	-	Array Breadth-First Search+2
438. Find All Anagrams in a String	Solution	Solve	Medium	-	Hash Table Sliding Window+1
416. Partition Equal Subset Sum	Solution	Solve	Medium	-	Array Dynamic Programming
409. Longest Palindrome	Solution	Solve	Easy	-	Greedy Hash Table+1
383. Ransom Note	Solution	Solve	Easy	-	Counting Hash Table+1
322. Coin Change	Solution	Solve	Medium	-	Array Breadth-First Search+1
310. Minimum Height Trees	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
23. Merge k Sorted Lists	Solution	Solve	Hard	-	Divide and Conquer Heap (Priority Queue)+2
57. Insert Interval	Solution	Solve	Medium	-	Array
56. Merge Intervals	Solution	Solve	Medium	-	Array Sorting
54. Spiral Matrix	Solution	Solve	Medium	-	Array Matrix+1
53. Maximum Subarray	Solution	Solve	Medium	-	Array Divide and Conquer+1
46. Permutations	Solution	Solve	Medium	-	Array Backtracking
42. Trapping Rain Water	Solution	Solve	Hard	-	Array Dynamic Programming+3
39. Combination Sum	Solution	Solve	Medium	-	Array Backtracking
33. Search in Rotated Sorted Array	Solution	Solve	Medium	-	Array Binary Search
62. Unique Paths	Solution	Solve	Medium	-	Combinatorics Dynamic Programming+1
21. Merge Two Sorted Lists	Solution	Solve	Easy	-	Linked List Recursion
20. Valid Parentheses	Solution	Solve	Easy	-	Stack String
17. Letter Combinations of a Phone Number	Solution	Solve	Medium	-	Backtracking Hash Table+1
15. 3Sum	Solution	Solve	Medium	-	Array Sorting+1
11. Container With Most Water	Solution	Solve	Medium	-	Array Greedy+1
8. String to Integer (atoi)	Solution	Solve	Medium	-	String
5. Longest Palindromic Substring	Solution	Solve	Medium	-	Dynamic Programming String+1
3. Longest Substring Without Repeating Characters	Solution	Solve	Medium	-	Hash Table Sliding Window+1
104. Maximum Depth of Binary Tree	Solution	Solve	Easy	-	Binary Tree Breadth-First Search+2
141. Linked List Cycle	Solution	Solve	Easy	-	Hash Table Linked List+1
139. Word Break	Solution	Solve	Medium	-	Array Dynamic Programming+4
133. Clone Graph	Solution	Solve	Medium	-	Breadth-First Search Depth-First Search+2
127. Word Ladder	Solution	Solve	Hard	-	Breadth-First Search Hash Table+1
125. Valid Palindrome	Solution	Solve	Easy	-	String Two Pointers
121. Best Time to Buy and Sell Stock	Solution	Solve	Easy	-	Array Dynamic Programming
110. Balanced Binary Tree	Solution	Solve	Easy	-	Binary Tree Depth-First Search+1
105. Construct Binary Tree from Preorder and Inorder Traversal	Solution	Solve	Medium	-	Array Binary Tree+3
1. Two Sum	Solution	Solve	Easy	-	Array Hash Table
102. Binary Tree Level Order Traversal	Solution	Solve	Medium	-	Binary Tree Breadth-First Search+1
98. Validate Binary Search Tree	Solution	Solve	Medium	-	Binary Search Tree Binary Tree+2
84. Largest Rectangle in Histogram	Solution	Solve	Hard	-	Array Monotonic Stack+1
79. Word Search	Solution	Solve	Medium	-	Array Backtracking+2
78. Subsets	Solution	Solve	Medium	-	Array Backtracking+1
76. Minimum Window Substring	Solution	Solve	Hard	-	Hash Table Sliding Window+1
75. Sort Colors	Solution	Solve	Medium	-	Array Sorting+1
70. Climbing Stairs	Solution	Solve	Easy	-	Dynamic Programming Math+1