DSA Study Sheet

101 curated problems · progress saved locally

0/101

Total Solved

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Easy

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Medium

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Two Sum#1
Hash MapTCS · Amazon · Microsoft +1
Easy
Best Time to Buy and Sell Stock#121
Sliding WindowTCS · Infosys · Amazon
Easy
Maximum Subarray (Kadane's)#53
DP / KadaneTCS · Wipro · Infosys +1
Easy
Product of Array Except Self#238
Prefix ProductAmazon · Google · Microsoft
Medium
Container With Most Water#11
Two PointerAmazon · Google
Medium
3Sum#15
Two PointerAmazon · Microsoft · Accenture
Medium
Trapping Rain Water#42
Two Pointer / StackAmazon · Google · Flipkart
Hard
Merge Intervals#56
SortingTCS · Amazon · Microsoft
Medium
Find Missing Number#268
XOR / MathTCS · Infosys · Wipro +1
Easy
Move Zeroes#283
Two PointerTCS · Wipro · HCL
Easy
Rotate Array#189
ReversalTCS · Infosys
Medium
Majority Element#169
Boyer-MooreTCS · Wipro · Amazon
Easy
Valid Anagram#242
Hash MapTCS · Infosys · Amazon
Easy
Longest Substring Without Repeating#3
Sliding WindowAmazon · Microsoft · Google
Medium
Valid Parentheses#20
StackTCS · Amazon · Microsoft +1
Easy
Longest Common Prefix#14
Sorting / TrieTCS · Infosys · Wipro +1
Easy
Reverse Words in a String#151
Two PointerTCS · Wipro · Accenture
Medium
String Compression#443
Two PointerTCS · Infosys · Microsoft
Medium
Palindrome Check#125
Two PointerTCS · Wipro · HCL +1
Easy
Minimum Window Substring#76
Sliding WindowAmazon · Google · Microsoft
Hard
Group Anagrams#49
Hash MapAmazon · Google
Medium
Longest Palindromic Substring#5
Expand Around CenterAmazon · Microsoft · Accenture
Medium
Reverse Linked List#206
Iterative / RecursiveTCS · Infosys · Wipro +1
Easy
Detect Cycle in Linked List#141
Floyd's CycleTCS · Infosys · Amazon +1
Easy
Merge Two Sorted Lists#21
Two PointerTCS · Amazon · Microsoft
Easy
Find Middle of Linked List#876
Fast/Slow PointerTCS · Wipro · HCL +1
Easy
Remove Nth Node From End#19
Two PointerAmazon · Microsoft
Medium
LRU Cache#146
Hash Map + DLLAmazon · Microsoft · Google
Medium
Add Two Numbers#2
CarryAmazon · Microsoft · Accenture
Medium
Palindrome Linked List#234
Fast/Slow + ReverseTCS · Infosys · Amazon
Easy