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CWV 100 DSA

100 curated DSA problems — arrays, strings, stacks, queues & linked lists with theory, hints & test cases

0 of 104 topics completed0%

Week 1: Arrays (Easy)

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Arrays — Theory & Patterns

Two Sum

Best Time to Buy and Sell Stock

Contains Duplicate

Maximum Subarray

Product of Array Except Self

Move Zeroes

Find the Missing Number

Remove Duplicates from Sorted Array

Rotate Array

Intersection of Two Arrays

Single Number

Merge Sorted Array

Plus One

Majority Element

Pascal's Triangle

Sorted Array to BST

Third Maximum Number

Find Pivot Index

Squares of a Sorted Array

Max Consecutive Ones

Week 2: Strings (Easy)

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Strings — Theory & Patterns

Reverse String

Valid Anagram

Week 3: Stack & Queue (Easy)

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Stacks & Queues — Theory & Patterns

Valid Parentheses

Min Stack

Week 4: Linked List (Easy)

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Linked Lists — Theory & Patterns

Reverse Linked List

Merge Two Sorted Lists

Week 5: Mixed Medium

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3Sum (Array)

Container With Most Water (Array)

Sort Colors (Array)

Valid Palindrome

Cohort

First Unique Character

Longest Common Prefix

Roman to Integer

Count and Say

Implement strStr()

String Compression

Isomorphic Strings

Ransom Note

Check Valid Parentheses (String)

Add Strings

Repeated Substring Pattern

Jewels and Stones

Defanging an IP Address

Goal Parser Interpretation

To Lower Case

Detect Capital

Reverse Words in a String III

Implement Queue Using Stacks

Cohort

Implement Stack Using Queues

Baseball Game

Next Greater Element I

Backspace String Compare

Remove All Adjacent Duplicates

Make the String Great

Remove Outermost Parentheses

Crawler Log Folder

Final Prices With Discount

Number of Students Unable to Eat

Time Needed to Buy Tickets

Build an Array With Stack Operations

Number of Recent Calls

Implement Stack Using Array

Implement Queue Using Array

Reverse String Using Stack

Balanced Brackets

Linked List Cycle

Cohort

Remove Duplicates from Sorted List

Palindrome Linked List

Middle of the Linked List

Intersection of Two Linked Lists

Remove Linked List Elements

Delete Node in a Linked List

Convert Binary Number in Linked List to Integer

Get Decimal Value of Binary Linked List

Design Linked List

Remove Nth Node From End

Add Two Numbers

Odd Even Linked List

Sort Linked List

Flatten a Multilevel Linked List

Swap Nodes in Pairs

Rotate List

Partition List

Subarray Sum Equals K (Array)

Cohort

Next Permutation (Array)

Longest Substring Without Repeating (String)

Group Anagrams (String)

Longest Palindromic Substring (String)

Zigzag Conversion (String)

String to Integer — atoi (String)

Daily Temperatures (Stack)

Evaluate Reverse Polish Notation (Stack)

Decode String (Stack)

Asteroid Collision (Stack)

Task Scheduler (Queue)

Add Two Numbers II (Linked List)

Reorder List (Linked List)

Copy List with Random Pointer (Linked List)

LRU Cache (Linked List)

Flatten Nested List Iterator (Stack)