Table of Contents

LeetCode Top 75

Updated: 2024-03-12

4 min read

LeetCode , LeetCodeTop75

Array / String

#	Problem	Difficulty	Slides/Video
1	1768. Merge Strings Alternately	Easy	✅ ✅
2	1071. Greatest Common Divisor of Strings	Easy	✅ ✅
3	1431. Kids With the Greatest Number of Candies	Easy	✅ ✅
4	605. Can Place Flowers	Easy
5	345. Reverse Vowels of a String	Easy
6	151. Reverse Words in a String	Medium	✅
7	238. Product of Array Except Self	Medium
8	334. Increasing Triplet Subsequence	Medium
9	443. String Compression	Medium

Two Pointers

#	Problem	Difficulty
10	283. Move Zeroes	Easy
11	392. Is Subsequence	Easy
12	11. Container With Most Water	Medium
13	1679. Max Number of K-Sum Pairs	Medium

Sliding Window

#	Problem	Difficulty
14	643. Maximum Average Subarray I	Easy
15	1456. Maximum Number of Vowels in a Substring of Given Length	Medium
16	1004. Max Consecutive Ones III	Medium
17	1493. Longest Subarray of 1’s After Deleting One Element	Medium

Prefix Sum

#	Problem	Difficulty	Slides/Video
18	1732. Find the Highest Altitude	Easy	✅
19	724. Find Pivot Index	Easy

Hash Map / Set

#	Problem	Difficulty
20	2215. Find the Difference of Two Arrays	Easy
21	1207. Unique Number of Occurrences	Easy
22	1657. Determine if Two Strings Are Close	Medium
23	2352. Equal Row and Column Pairs	Medium

Stack

#	Problem	Difficulty
24	2390. Removing Stars From a String	Medium
25	735. Asteroid Collision	Medium
26	394. Decode String	Medium

Queue

#	Problem	Difficulty
27	933. Number of Recent Calls	Easy
28	649. Dota2 Senate	Medium

Linked List

#	Problem	Difficulty
31	141. Linked List Cycle	Easy
31	206. Reverse Linked List	Easy
29	2095. Delete the Middle Node of a Linked List	Medium
30	328. Odd Even Linked List	Medium
32	2130. Maximum Twin Sum of a Linked List	Medium

Binary Tree - DFS

#	Problem	Difficulty
33	104. Maximum Depth of Binary Tree	Easy
34	872. Leaf-Similar Trees	Easy
35	1448. Count Good Nodes in Binary Tree	Medium
36	437. Path Sum III	Medium
37	1372. Longest ZigZag Path in a Binary Tree	Medium
38	236. Lowest Common Ancestor of a Binary Tree	Medium

Binary Tree - BFS

#	Problem	Difficulty
39	199. Binary Tree Right Side View	Medium
40	1161. Maximum Level Sum of a Binary Tree	Medium

Binary Search Tree

#	Problem	Difficulty
41	700. Search in a Binary Search Tree	Easy
42	450. Delete Node in a BST	Medium

Graphs - DFS

#	Problem	Difficulty
43	841. Keys and Rooms	Medium
44	547. Number of Provinces	Medium
45	1466. Reorder Routes to Make All Paths Lead to the City Zero	Medium
46	399. Evaluate Division	Medium

Graphs - BFS

#	Problem	Difficulty
47	1926. Nearest Exit from Entrance in Maze	Medium
48	994. Rotting Oranges	Medium

Heap / Priority Queue

#	Problem	Difficulty
49	Kth Largest Element in an Array	Medium
50	Smallest Number in Infinite Set	Medium
51	Maximum Subsequence Score	Medium
52	Total Cost to Hire K Workers	Medium

Binary Search

#	Problem	Difficulty
53	Guess Number Higher or Lower	Easy
54	Successful Pairs of Spells and Potions	Medium
55	162. Find Peak Element	Medium
56	Koko Eating Bananas	Medium

Backtracking

#	Problem	Difficulty
57	17. Letter Combinations of a Phone Number	Medium
58	Combination Sum III	Medium

DP - 1D

#	Problem	Difficulty
59	N-th Tribonacci Number	Easy
60	Min Cost Climbing Stairs	Easy
61	House Robber	Medium
62	Domino and Tromino Tiling	Medium

DP - Multidimensional

#	Problem	Difficulty
63	Unique Paths	Medium
64	Longest Common Subsequence	Medium
65	Best Time to Buy and Sell Stock with Transaction Fee	Medium
66	Edit Distance	Medium

Bit Manipulation

#	Problem	Difficulty
67	Counting Bits	Easy
68	136. Single Number	Easy
69	Minimum Flips to Make a OR b Equal to c	Medium

Trie

#	Problem	Difficulty
70	208. Implement Trie (Prefix Tree)	Medium
71	Search Suggestions System	Medium

Intervals

#	Problem	Difficulty
72	435. Non-overlapping Intervals	Medium
73	Minimum Number of Arrows to Burst Balloons	Medium

Monotonic Stack

#	Problem	Difficulty
74	Daily Temperatures	Medium
75	Online Stock Span	Medium

Links

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