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
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
455. Assign Cookies	Solve	Easy	Apple	Array Greedy+2
456. 132 Pattern	Solve	Medium	Amazon+1	Array Binary Search+3
457. Circular Array Loop	Solve	Medium	Goldman Sachs	Array Hash Table+1
458. Poor Pigs	Solve	Hard	Adobe+2	Combinatorics Dynamic Programming+1
459. Repeated Substring Pattern	Solve	Easy	Amazon+4	String String Matching
460. LFU Cache	Solve	Hard	Amazon+9	Design Doubly-Linked List+2
461. Hamming Distance	Solve	Easy	Google	Bit Manipulation
462. Minimum Moves to Equal Array Elements II	Solve	Medium	Microsoft	Array Math+1
463. Island Perimeter	Solve	Easy	Amazon+2	Array Breadth-First Search+2
464. Can I Win	Solve	Medium	LinkedIn	Bit Manipulation Bitmask+4
465. Optimal Account Balancing	Solve	Hard	Affirm+3	Array Backtracking+3
466. Count The Repetitions	Solve	Hard	Amazon	Dynamic Programming String
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
471. Encode String with Shortest Length	Solve	Hard	Google	Dynamic Programming String
472. Concatenated Words	Solve	Hard	Amazon+1	Array Depth-First Search+3
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
476. Number Complement	Solve	Easy	Amazon+1	Bit Manipulation
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
479. Largest Palindrome Product	Solve	Hard	Yahoo	Enumeration Math
480. Sliding Window Median	Solve	Hard	Facebook+3	Array Hash Table+2
481. Magical String	Solve	Medium	Google	String Two Pointers
482. License Key Formatting	Solve	Easy	Capital One+1	String
483. Smallest Good Base	Solve	Hard	Microsoft	Binary Search Math
484. Find Permutation	Solve	Medium	Goldman Sachs+1	Array Greedy+2
485. Max Consecutive Ones	Solve	Easy	Apple+1	Array
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
488. Zuma Game	Solve	Hard	Baidu+2	Breadth-First Search Dynamic Programming+3
489. Robot Room Cleaner	Solve	Hard	Amazon+5	Backtracking Interactive
490. The Maze	Solve	Medium	Amazon+6	Array Breadth-First Search+2
491. Non-decreasing Subsequences	Solve	Medium	Amazon+1	Array Backtracking+2
492. Construct the Rectangle	Solve	Easy	Bloomberg	Math
493. Reverse Pairs	Solve	Hard	Amazon	Array Binary Indexed Tree+5
494. Target Sum	Solve	Medium	Adobe+4	Array Backtracking+1
495. Teemo Attacking	Solve	Easy	Riot Games+1	Array Simulation
496. Next Greater Element I	Solve	Easy	Adobe+9	Array Hash Table+2
497. Random Point in Non-overlapping Rectangles	Solve	Medium	Google	Array Binary Search+5
498. Diagonal Traverse	Solve	Medium	Facebook+2	Array Matrix+1
499. The Maze III	Solve	Hard	Google	Array Breadth-First Search+6
500. Keyboard Row	Solve	Easy	Mathworks	Array Hash Table+1