Leetcode Top 150.md

Important DSA Questions

Leetcode Top 150 - Easy + Medium

Number	Problem Name	Solution
1	Two Sum	Two Sum
2	Valid Palindrome	Valid Palindrome
3	3sum	3sum
4	Remove Element	Remove Element
5	Remove Duplicates from Sorted Array	Remove Duplicates
6	Remove Duplicates from Sorted Array II	Remove Duplicates II
7	Majority Element	Majority Element
8	Merge Sorted Array	Merge Sorted Array
9	Best Time to Buy and Sell Stock	Stock I
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11	Is Subsequence	Is Subsequence
12	Valid Parentheses	Valid Parentheses
13	Valid Anagram	Valid Anagram
14	Plus One	Plus One
15	Palindrome Number	Palindrome Number
16	Single Number	Single Number
17	Ransom Note	Ransom Note
18	Longest Common Prefix	Longest Common Prefix
19	Length of Last Word	Length of Last Word
20	Isomorphic Strings	Isomorphic Strings
21	Happy Number	Happy Number
22	Word Pattern	Word Pattern
23	Contains Duplicate II	Contains Duplicate II
24	Sqrt(x)	Sqrt(x)
25	Number of 1 Bits	Number of 1 Bits
26	Find the Index of the First Occurrence in a String	Find the Index of the First Occurrence in a String
27	Reverse Bits	Reverse Bits
28	Add Binary	Add Binary
29	Search Insert Position	Search Insert Position
30	Group Anagrams	Group Anagrams
31	Summary Ranges	Summary Ranges
32	Longest Consecutive Sequence	Longest Consecutive Sequence
33	Evaluate Reverse Polish Notation	Evaluate Reverse Polish Notation
34	Min Stack	Min Stack
35	Simplify Path	Simplify Path
36	Basic Calculator	Basic Calculator
37	Container With Most Water	Container With Most Water
38	Two Sum II - Input Array Is Sorted	Two Sum II - Input Array Is Sorted
39	Pow(x, n)	Pow(x, n)
40	Factorial Trailing Zeroes	Factorial Trailing Zeroes
41	Best Time to Buy and Sell Stock II	Best Time to Buy and Sell Stock II
42	Product of Array Except Self	Product of Array Except Self
43	Maximum Subarray	Maximum Subarray
44	Maximum Sum Circular Subarray	Maximum Sum Circular Subarray
45	Reverse Words in a String	Reverse Words in a String
46	Linked List Cycle	Linked List Cycle
47	Add Two Numbers	Add Two Numbers
48	Insert Delete GetRandom O(1)	Insert Delete GetRandom O(1)
49	Rotate Array	Rotate Array
50	Jump Game	Jump Game
51	Jump Game II	Jump Game II
52	LRU Cache	LRU Cache
53	Top K Frequent Elements	Top K Frequent Elements
54	String Encode and Decode	String Encode and Decode
55	Valid Sudoku	Valid Sudoku
56	Merge Two Sorted Lists	Merge Two Sorted Lists
57	Remove Duplicates from Sorted List II	Remove Duplicates from Sorted List II
58	Validate Binary Search Tree	Validate Binary Search Tree
59	Binary Tree Level Order Traversal	Binary Tree Level Order Traversal
60	Symmetric Tree	Symmetric Tree
61	Invert Binary Tree	Invert Binary Tree
62	Maximum Depth of Binary Tree	Maximum Depth of Binary Tree
63	Same Tree	Same Tree
64	Longest Substring Without Repeating Characters	Longest Substring Without Repeating Characters
65	Minimum Size Subarray Sum	Minimum Size Subarray Sum
66	House Robber	House Robber
67	Word Break	Word Break
68	Merge Intervals	Merge Intervals
69	Rotate List	Rotate List
70	Copy List with Random Pointer	Copy List with Random Pointer
71	Reverse Linked List	Reverse Linked List
72	Remove Nth Node From End of List	Remove Nth Node From End of List
73	Counting Bits	Counting Bits
74	Minimum Number of Arrows to Burst Balloons	Minimum Number of Arrows to Burst Balloons
75	Insert Interval	Insert Interval
76	Reverse Linked List II	Reverse Linked List II
77	Partition List	Partition List
78	Zigzag Conversion	Zigzag Conversion
79	Roman to Integer	Roman to Integer
80	Integer to Roman	Integer to Roman
81	Gas Station	Gas Station
82	H-Index	H-Index
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Leetcode Top 150 - Hard

Number	Problem Name	Solution
1	Max Points on a Line	Max Points on a Line
2	Trapping Rain Water	Trapping Rain Water
3	Reverse Nodes in k-Group	Reverse Nodes in k-Group