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
430. Flatten a Multilevel Doubly Linked List	Solve	Medium	Amazon+3	Depth-First Search Doubly-Linked List+1
433. Minimum Genetic Mutation	Solve	Medium	Amazon+4	Breadth-First Search Hash Table+1
435. Non-overlapping Intervals	Solve	Medium	Amazon+7	Array Dynamic Programming+2
436. Find Right Interval	Solve	Medium	Amazon+1	Array Binary Search+1
437. Path Sum III	Solve	Medium	DoorDash+3	Binary Tree Depth-First Search+1
438. Find All Anagrams in a String	Solve	Medium	Adobe+9	Hash Table Sliding Window+1
439. Ternary Expression Parser	Solve	Medium	Snapchat	Recursion Stack+1
442. Find All Duplicates in an Array	Solve	Medium	Adobe+4	Array Hash Table
443. String Compression	Solve	Medium	Amazon+8	String Two Pointers
444. Sequence Reconstruction	Solve	Medium	Google	Array Graph+1
445. Add Two Numbers II	Solve	Medium	Accenture+49	Linked List Math+1
447. Number of Boomerangs	Solve	Medium	Google	Array Hash Table+1
449. Serialize and Deserialize BST	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+5
450. Delete Node in a BST	Solve	Medium	Amazon+4	Binary Search Tree Binary Tree+1
451. Sort Characters By Frequency	Solve	Medium	Amazon+4	Bucket Sort Counting+4
452. Minimum Number of Arrows to Burst Balloons	Solve	Medium	Facebook+2	Array Greedy+1
453. Minimum Moves to Equal Array Elements	Solve	Medium	Goldman Sachs+3	Array Math
454. 4Sum II	Solve	Medium	Adobe+3	Array Hash Table
456. 132 Pattern	Solve	Medium	Amazon+1	Array Binary Search+3
457. Circular Array Loop	Solve	Medium	Goldman Sachs	Array Hash Table+1
462. Minimum Moves to Equal Array Elements II	Solve	Medium	Microsoft	Array Math+1
464. Can I Win	Solve	Medium	LinkedIn	Bit Manipulation Bitmask+4
467. Unique Substrings in Wraparound String	Solve	Medium	Apple+1	Dynamic Programming String
468. Validate IP Address	Solve	Medium	Amazon+2	String
469. Convex Polygon	Solve	Medium	Google	Array Geometry+1
470. Implement Rand10() Using Rand7()	Solve	Medium	Amazon+2	Math Probability and Statistics+2
473. Matchsticks to Square	Solve	Medium	Microsoft	Array Backtracking+3
474. Ones and Zeroes	Solve	Medium	Apple	Array Dynamic Programming+1
475. Heaters	Solve	Medium	Amazon+1	Array Binary Search+2
477. Total Hamming Distance	Solve	Medium	Adobe+1	Array Bit Manipulation+1
478. Generate Random Point in a Circle	Solve	Medium	Leap Motion	Geometry Math+2
481. Magical String	Solve	Medium	Google	String Two Pointers
484. Find Permutation	Solve	Medium	Goldman Sachs+1	Array Greedy+2
486. Predict the Winner	Solve	Medium	Amazon+4	Array Dynamic Programming+3
487. Max Consecutive Ones II	Solve	Medium	Microsoft+1	Array Dynamic Programming+1
490. The Maze	Solve	Medium	Amazon+6	Array Breadth-First Search+2
491. Non-decreasing Subsequences	Solve	Medium	Amazon+1	Array Backtracking+2
494. Target Sum	Solve	Medium	Adobe+4	Array Backtracking+1
497. Random Point in Non-overlapping Rectangles	Solve	Medium	Google	Array Binary Search+5
498. Diagonal Traverse	Solve	Medium	Facebook+2	Array Matrix+1
503. Next Greater Element II	Solve	Medium	Adobe+9	Array Monotonic Stack+1
505. The Maze II	Solve	Medium	Bytedance+2	Array Breadth-First Search+5
508. Most Frequent Subtree Sum	Solve	Medium	Apple	Binary Tree Depth-First Search+2
510. Inorder Successor in BST II	Solve	Medium	Arista Networks+1	Binary Search Tree Binary Tree+1
513. Find Bottom Left Tree Value	Solve	Medium	Amazon+2	Binary Tree Breadth-First Search+2
515. Find Largest Value in Each Tree Row	Solve	Medium	Amazon+5	Binary Tree Breadth-First Search+2
516. Longest Palindromic Subsequence	Solve	Medium	Amazon+5	Dynamic Programming String
518. Coin Change II	Solve	Medium	Accenture+68	Array Dynamic Programming
519. Random Flip Matrix	Solve	Medium	Google	Hash Table Math+2
522. Longest Uncommon Subsequence II	Solve	Medium	Apple	Array Hash Table+3