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Table Of Contents

easy

13. Roman to Integer

14. Longest Common Prefix

20. Valid Parentheses

26. Remove Duplicates from Sorted Array

35. Search Insert Position

70. Climbing Stairs

88. Merge Sorted Array (In-Place)

104. Maximum Depth of Binary Tree

118. Pascal's Triangle

121. Best Time to Buy and Sell Stock

205. Isomorphic Strings

242. Valid Anagram

283. Move Zeroes

345. Reverse Vowels of a String

605. Can Place Flowers

704. Binary Search

796. Rotate String

1071. Greatest Common Divisor of Strings

1299. Replace Elements with Greatest Element on Right Side

1431. Kids With the Greatest Number of Candies

1614. Maximum Nesting Depth of the Parentheses

1752. Check if Array Is Sorted and Rotated

1768. Merge Strings Alternately

1903. Largest Odd Number in String

2965. Find Missing and Repeated Values

hard

25. Reverse Nodes in k-Group

26. Remove Duplicates from Sorted Array

27. Remove Element

42. Trapping Rain Water

80. Remove Duplicates from Sorted Array II

88. Merge Sorted Array

121. Best Time to Buy and Sell Stock

122. Best Time to Buy and Sell Stock II

189. Rotate Array

medium

2. Add Two Numbers

3. Longest Substring Without Repeating Characters

5. Longest Palindromic Substring

8. String to Integer (atoi)

11. Container With Most Water

17. Letter Combinations of a Phone Number

19. Remove Nth Node From End of List

22. Generate Parentheses

33. Search in Rotated Sorted Array

34. Find First and Last Position of Element in Sorted Array

48. Rotate Image

49. Group Anagrams

53. Maximum Subarray

54. Spiral Matrix

56. Merge Intervals

61. Rotate List

73. Set Matrix Zeroes

74. Search a 2D Matrix

75. Sort Colors

137. Single Number II

138. Copy List with Random Pointer

150. Evaluate Reverse Polish Notation

151. Reverse Words in a String

153. Find Minimum in Rotated Sorted Array

162. Find Peak Element

169. Majority Element

198. House Robber

207. Course Schedule

215. Kth Largest Element in an Array

227. Basic Calculator II

236. Lowest Common Ancestor of a Binary Tree

237. Delete Node in a Linked List

238. Product of Array Except Self

451. Sort Characters By Frequency

540. Single Element in a Sorted Array

560. Subarray Sum Equals K

636. Exclusive Time of Functions

875. Koko Eating Bananas

1011. Capacity To Ship Packages Within D Days

1101. The Earliest Moment When Everyone Become Friends

1283. Find the Smallest Divisor Given a Threshold

2140. Solving Questions With Brainpower

3169. Count Days Without Meetings

3481. Apply Substitutions

rotate-array-approach-1

189. Rotate Array (Approach 2 )

189. Rotate Array (Approach 1 )

number-of-islands-approach-1

200. Number of Islands (Approach 2)

200. Number of Islands (Approach 1)

meeting-rooms-ii-approach-1

253. Approach Using Priority Queue

253. Meeting Rooms II

misc

Calculate Floor & Ceiling

Find Nth Root Of M

Flatten A Linked List

Implement Lower Bound

Implement Upper Bound

Number of occurrence

take-u-forward

Recently Solved

arrays

The Ultimate Array Pattern Playbook

faqs-hard

Count Inversions in an Array

Find The Repeating And Missing Number

Majority Element II

Maximum Product Subarray

Merge Sorted Array (In-Place)

faqs-medium

Maximum Subarray

Leaders in an Array

Majority Element

Next Permutation

Get specific element from Pascal's Triangle

Pascal's Triangle II (Row Generation)

Generate Pascal's Triangle (Full)

Spiral Matrix Traversal

Rearrange Array Elements by Sign

Sort Colors (Dutch National Flag)

fundamentals

Check if Array is Sorted

Largest Element in an Array

Array Rotation (Left and Right)

Left Rotate Array by One

Max Consecutive Ones

Second Largest Element in an Array

logic-building

Intersection of Two Sorted Arrays (with Duplicates)

Move Zeros to End

Remove Duplicates from Sorted Array

Union of Two Sorted Arrays

binary-search

d-arrays

Find Row With Maximum 1'S

Search In A 2D Matrix

faqs

Aggressive Cows

Find Peak Element

Kth Element Of 2 Sorted Arrays

Minimise Max Distance to Gas Stations

Split Array - Largest Sum

fundamentals

logic-building

Count Occurrences in a Sorted Array

Find Minimum in Rotated Sorted Array

Find out how many times the array is rotated

Find First and Last Position of Element in Sorted Array

Floor and Ceil in Sorted Array

Kth Missing Positive Number

Search in Rotated Sorted Array

Search in Rotated Sorted Array II (With Duplicates)

Search Insert Position

Single Element in a Sorted Array

on-answers

Capacity To Ship Packages Within D Days

Find Nth Root of M

Find Square Root of a Number

Smallest Divisor Given a Threshold

Koko Eating Bananas (Minimum Rate)

Minimum Days to Make M Bouquets

Painter's Partition Problem

Split Array Largest Sum

hashing

faqs

Subarray Sum Equals K

Count Subarrays with Given XOR K

Largest Subarray with 0 Sum

Longest Consecutive Sequence

Longest Subarray with Sum K

recursion

faqs-medium

Combination Sum II (Unique Combinations)

Combination Sum (Unbounded)

hard

Letter Combinations of a Phone Number

implementation-problems

Generate Parentheses

Power Function: pow(x, n)

Subsets (The Power Set)

subsequence-pattern-problems

Subsequence Sum Existence

Count All Subsequences With Sum K

sorting

string

Isomorphic Strings

Largest Odd Number in String

Longest Common Prefix

Reverse Words in a String

Code Scratch›take u forward›arrays›faqs hard

Find The Repeating And Missing Number

PreviousCount Inversions in an Array NextMajority Element II