Dashboard Questions Topics Companies Sheets

Data Structures & Algorithms

Practice 3,374+ coding problems from top companies. Master DSA concepts and ace your interviews.

3,374

Problems

840

Easy

1762

Medium

772

Hard

Difficulty

All3374 Easy840 Medium1762 Hard772

Title	Solve	Difficulty	Companies	Topics
3201. Find the Maximum Length of Valid Subsequence I	Solve	Medium	-	Array Dynamic Programming
3202. Find the Maximum Length of Valid Subsequence II	Solve	Medium	-	Array Dynamic Programming
3203. Find Minimum Diameter After Merging Two Trees	Solve	Hard	-	Breadth-First Search Depth-First Search+2
3204. Bitwise User Permissions Analysis	Solve	Medium	-	Database
3205. Maximum Array Hopping Score I	Solve	Medium	-	Array Dynamic Programming+3
3206. Alternating Groups I	Solve	Easy	-	Array Sliding Window
3207. Maximum Points After Enemy Battles	Solve	Medium	-	Array Greedy
3208. Alternating Groups II	Solve	Medium	-	Array Sliding Window
3209. Number of Subarrays With AND Value of K	Solve	Hard	-	Array Binary Search+2
3210. Find the Encrypted String	Solve	Easy	-	String
3211. Generate Binary Strings Without Adjacent Zeros	Solve	Medium	-	Backtracking Bit Manipulation+1
3212. Count Submatrices With Equal Frequency of X and Y	Solve	Medium	-	Array Matrix+1
3213. Construct String with Minimum Cost	Solve	Hard	-	Array Dynamic Programming+2
3214. Year on Year Growth Rate	Solve	Hard	-	Database
3215. Count Triplets with Even XOR Set Bits II	Solve	Medium	-	Array Bit Manipulation
3216. Lexicographically Smallest String After a Swap	Solve	Easy	-	Greedy String
3217. Delete Nodes From Linked List Present in Array	Solve	Medium	-	Array Hash Table+1
3218. Minimum Cost for Cutting Cake I	Solve	Medium	-	Array Dynamic Programming+2
3219. Minimum Cost for Cutting Cake II	Solve	Hard	-	Array Greedy+1
3220. Odd and Even Transactions	Solve	Medium	-	Database
3221. Maximum Array Hopping Score II	Solve	Medium	-	Array Greedy+2
3222. Find the Winning Player in Coin Game	Solve	Easy	-	Game Theory Math+1
3223. Minimum Length of String After Operations	Solve	Medium	-	Counting Hash Table+1
3224. Minimum Array Changes to Make Differences Equal	Solve	Medium	-	Array Hash Table+1
3225. Maximum Score From Grid Operations	Solve	Hard	-	Array Dynamic Programming+2
3226. Number of Bit Changes to Make Two Integers Equal	Solve	Easy	-	Bit Manipulation
3227. Vowels Game in a String	Solve	Medium	-	Brainteaser Game Theory+2
3228. Maximum Number of Operations to Move Ones to the End	Solve	Medium	-	Counting Greedy+1
3229. Minimum Operations to Make Array Equal to Target	Solve	Hard	-	Array Dynamic Programming+3
3230. Customer Purchasing Behavior Analysis	Solve	Medium	-	Database
3231. Minimum Number of Increasing Subsequence to Be Removed	Solve	Hard	-	Array Binary Search
3232. Find if Digit Game Can Be Won	Solve	Easy	-	Array Math
3233. Find the Count of Numbers Which Are Not Special	Solve	Medium	-	Array Math+1
3234. Count the Number of Substrings With Dominant Ones	Solve	Medium	-	Enumeration Sliding Window+1
3235. Check if the Rectangle Corner Is Reachable	Solve	Hard	-	Array Breadth-First Search+4
3236. CEO Subordinate Hierarchy	Solve	Hard	-	Database
3237. Alt and Tab Simulation	Solve	Medium	-	Array Hash Table+1
3238. Find the Number of Winning Players	Solve	Easy	-	Array Counting+1
3239. Minimum Number of Flips to Make Binary Grid Palindromic I	Solve	Medium	-	Array Matrix+1
3240. Minimum Number of Flips to Make Binary Grid Palindromic II	Solve	Medium	-	Array Matrix+1
3241. Time Taken to Mark All Nodes	Solve	Hard	-	Depth-First Search Dynamic Programming+2
3242. Design Neighbor Sum Service	Solve	Easy	-	Array Design+3
3243. Shortest Distance After Road Addition Queries I	Solve	Medium	-	Array Breadth-First Search+1
3244. Shortest Distance After Road Addition Queries II	Solve	Hard	-	Array Graph+2
3245. Alternating Groups III	Solve	Hard	-	Array Binary Indexed Tree
3246. Premier League Table Ranking	Solve	Easy	-	Database
3247. Number of Subsequences with Odd Sum	Solve	Medium	-	Array Combinatorics+2
3248. Snake in Matrix	Solve	Easy	-	Array Simulation+1
3249. Count the Number of Good Nodes	Solve	Medium	-	Depth-First Search Tree
3250. Find the Count of Monotonic Pairs I	Solve	Hard	-	Array Combinatorics+3