Next Blind 75

Another set of 75 DSA problems for revision

📝 75 problems•⏱️ Est. 2-3 hours•🎯 Interview Prep

Questions (75)

Tap on any question to view the full solution

E

Valid Palindrome

#76

Optimized solution summary here.

H

Trapping Rain Water

#77

Optimized solution summary here.

M

Longest Substring Without Repeating Characters

#78

Optimized solution summary here.

M

Longest Repeating Character Replacement

#79

Optimized solution summary here.

M

Permutation in String

#80

Optimized solution summary here.

H

Minimum Window Substring

#81

Optimized solution summary here.

H

Sliding Window Maximum

#82

Optimized solution summary here.

E

Binary Search

#83

Optimized solution summary here.

M

Search a 2D Matrix

#84

Optimized solution summary here.

M

Koko Eating Bananas

#85

Optimized solution summary here.

M

Time Based Key-Value Store

#86

Optimized solution summary here.

M

Add Two Numbers

#87

Optimized solution summary here.

M

Copy List with Random Pointer

#88

Optimized solution summary here.

E

Intersection of Two Linked Lists

#89

Optimized solution summary here.

E

Single Number

#90

Optimized solution summary here.

M

Reverse Integer

#91

Optimized solution summary here.

M

Encode and Decode Strings

#92

Optimized solution summary here.

M

Word Search

#93

Optimized solution summary here.

M

Palindrome Partitioning

#94

Optimized solution summary here.

H

N-Queens

#95

Optimized solution summary here.

H

Reverse Nodes in k-Group

#96

Optimized solution summary here.

H

Longest Valid Parentheses

#97

Optimized solution summary here.

H

Regular Expression Matching

#98

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H

Wildcard Matching

#99

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H

Word Ladder

#100

Optimized solution summary here.

H

Word Ladder II

#101

Optimized solution summary here.

H

Edit Distance

#102

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M

Gas Station

#103

Optimized solution summary here.

M

Hand of Straights

#104

Optimized solution summary here.

M

Rotate Array

#105

Optimized solution summary here.

M

Set Matrix Zeroes

#106

Optimized solution summary here.

M

Spiral Matrix

#107

Optimized solution summary here.

M

Multiply Strings

#108

Optimized solution summary here.

E

Happy Number

#109

Optimized solution summary here.

E

Plus One

#110

Optimized solution summary here.

M

Pow(x, n)

#111

Optimized solution summary here.

M

Subsets

#112

Optimized solution summary here.

M

Permutations

#113

Optimized solution summary here.

M

Task Scheduler

#114

Optimized solution summary here.

M

Kth Largest Element in an Array

#115

Optimized solution summary here.

H

First Missing Positive

#116

Optimized solution summary here.

H

Palindrome Pairs

#117

Optimized solution summary here.

H

Maximal Rectangle

#118

Optimized solution summary here.

M

Surrounded Regions

#119

Optimized solution summary here.

M

Rotting Oranges

#120

Optimized solution summary here.

M

Course Schedule II

#121

Optimized solution summary here.

H

Basic Calculator

#122

Optimized solution summary here.

M

Basic Calculator II

#123

Optimized solution summary here.

H

Largest Rectangle in Histogram

#124

Optimized solution summary here.

E

Merge Sorted Array

#125

Optimized solution summary here.

M

Evaluate Division

#126

Optimized solution summary here.

M

Insert Delete GetRandom O(1)

#127

Optimized solution summary here.

M

LRU Cache

#128

Optimized solution summary here.

H

LFU Cache

#129

Optimized solution summary here.

M

Design Hit Counter

#130

Optimized solution summary here.

M

Design Snake Game

#131

Optimized solution summary here.

E

Logger Rate Limiter

#132

Optimized solution summary here.

M

Serialize and Deserialize BST

#133

Optimized solution summary here.

M

Flatten Nested List Iterator

#134

Optimized solution summary here.

M

Range Sum Query 2D - Immutable

#135

Optimized solution summary here.

H

Range Sum Query 2D - Mutable

#136

Optimized solution summary here.

M

Design Add and Search Words Data Structure

#137

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H

Design In-Memory File System

#138

Optimized solution summary here.

M

Design Tic-Tac-Toe

#139

Optimized solution summary here.

M

Random Pick with Weight

#140

Optimized solution summary here.

M

Shuffle an Array

#141

Optimized solution summary here.

M

Design Twitter

#142

Optimized solution summary here.

H

Find Median from Data Stream

#143

Optimized solution summary here.

M

Design Phone Directory

#144

Optimized solution summary here.

H

Design Skiplist

#145

Optimized solution summary here.

E

Design HashMap

#146

Optimized solution summary here.

E

Design HashSet

#147

Optimized solution summary here.

M

Implement Trie (Prefix Tree)

#148

Optimized solution summary here.

M

Implement Magic Dictionary

#149

Optimized solution summary here.

H

Design Search Autocomplete System

#150

Optimized solution summary here.

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