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
3237. Alt and Tab Simulation	Solve	Medium	-	Array Hash Table+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
3243. Shortest Distance After Road Addition Queries I	Solve	Medium	-	Array Breadth-First Search+1
3247. Number of Subsequences with Odd Sum	Solve	Medium	-	Array Combinatorics+2
3249. Count the Number of Good Nodes	Solve	Medium	-	Depth-First Search Tree
3252. Premier League Table Ranking II	Solve	Medium	-	Database
3253. Construct String with Minimum Cost (Easy)	Solve	Medium	-
3254. Find the Power of K-Size Subarrays I	Solve	Medium	-	Array Sliding Window
3255. Find the Power of K-Size Subarrays II	Solve	Medium	-	Array Sliding Window
3259. Maximum Energy Boost From Two Drinks	Solve	Medium	-	Array Dynamic Programming
3262. Find Overlapping Shifts	Solve	Medium	-	Database
3265. Count Almost Equal Pairs I	Solve	Medium	-	Array Counting+3
3271. Hash Divided String	Solve	Medium	-	Simulation String
3275. K-th Nearest Obstacle Queries	Solve	Medium	-	Array Heap (Priority Queue)
3278. Find Candidates for Data Scientist Position II	Solve	Medium	-	Database
3281. Maximize Score of Numbers in Ranges	Solve	Medium	-	Array Binary Search+2
3282. Reach End of Array With Max Score	Solve	Medium	-	Array Greedy
3284. Sum of Consecutive Subarrays	Solve	Medium	-	Array Dynamic Programming+1
3286. Find a Safe Walk Through a Grid	Solve	Medium	-	Array Breadth-First Search+4
3290. Maximum Multiplication Score	Solve	Medium	-	Array Dynamic Programming
3291. Minimum Number of Valid Strings to Form Target I	Solve	Medium	-	Array Binary Search+7
3293. Calculate Product Final Price	Solve	Medium	-	Database
3294. Convert Doubly Linked List to Array II	Solve	Medium	-	Array Doubly-Linked List+1
3295. Report Spam Message	Solve	Medium	-	Array Hash Table+1
3296. Minimum Number of Seconds to Make Mountain Height Zero	Solve	Medium	-	Array Binary Search+3
3297. Count Substrings That Can Be Rearranged to Contain a String I	Solve	Medium	-	Hash Table Sliding Window+1
3301. Maximize the Total Height of Unique Towers	Solve	Medium	-	Array Greedy+1
3302. Find the Lexicographically Smallest Valid Sequence	Solve	Medium	-	Dynamic Programming Greedy+2
3305. Count of Substrings Containing Every Vowel and K Consonants I	Solve	Medium	-	Hash Table Sliding Window+1
3306. Count of Substrings Containing Every Vowel and K Consonants II	Solve	Medium	-	Hash Table Sliding Window+1
3308. Find Top Performing Driver	Solve	Medium	-	Database
3309. Maximum Possible Number by Binary Concatenation	Solve	Medium	-	Array Bit Manipulation+1
3310. Remove Methods From Project	Solve	Medium	-	Breadth-First Search Depth-First Search+1
3315. Construct the Minimum Bitwise Array II	Solve	Medium	-	Array Bit Manipulation
3316. Find Maximum Removals From Source String	Solve	Medium	-	Array Dynamic Programming+3
3319. K-th Largest Perfect Subtree Size in Binary Tree	Solve	Medium	-	Binary Tree Depth-First Search+2
3322. Premier League Table Ranking III	Solve	Medium	-	Database
3323. Minimize Connected Groups by Inserting Interval	Solve	Medium	-	Array Binary Search+2
3324. Find the Sequence of Strings Appeared on the Screen	Solve	Medium	-	Simulation String
3325. Count Substrings With K-Frequency Characters I	Solve	Medium	-	Hash Table Sliding Window+1
3326. Minimum Division Operations to Make Array Non Decreasing	Solve	Medium	-	Array Greedy+2
3328. Find Cities in Each State II	Solve	Medium	-	Database
3331. Find Subtree Sizes After Changes	Solve	Medium	-	Array Depth-First Search+3
3332. Maximum Points Tourist Can Earn	Solve	Medium	-	Array Dynamic Programming+1
3334. Find the Maximum Factor Score of Array	Solve	Medium	-	Array Math+1
3335. Total Characters in String After Transformations I	Solve	Medium	-	Counting Dynamic Programming+3
3338. Second Highest Salary II	Solve	Medium	-	Database
3339. Find the Number of K-Even Arrays	Solve	Medium	-	Dynamic Programming
3341. Find Minimum Time to Reach Last Room I	Solve	Medium	-	Array Graph+3