Dashboard Questions Topics Companies Sheets

Amazon Interview Questions

1,113 coding problems asked in Amazon interviews. Prepare for your technical interview with real questions.

1,113

Problems

267

Easy

645

Medium

201

Hard

Difficulty

All1113 Easy267 Medium645 Hard201

Title	Solve	Difficulty	Companies	Topics
414. Third Maximum Number	Solve	Easy	Amazon+2	Array Sorting
415. Add Strings	Solve	Easy	Amazon+7	Math Simulation+1
416. Partition Equal Subset Sum	Solve	Medium	Amazon+5	Array Dynamic Programming
417. Pacific Atlantic Water Flow	Solve	Medium	Amazon+3	Array Breadth-First Search+2
419. Battleships in a Board	Solve	Medium	Amazon+6	Array Depth-First Search+1
420. Strong Password Checker	Solve	Hard	Amazon+1	Greedy Heap (Priority Queue)+1
424. Longest Repeating Character Replacement	Solve	Medium	Adobe+3	Hash Table Sliding Window+1
426. Convert Binary Search Tree to Sorted Doubly Linked List	Solve	Medium	Amazon+2	Binary Search Tree Binary Tree+5
428. Serialize and Deserialize N-ary Tree	Solve	Hard	Amazon+7	Breadth-First Search Depth-First Search+2
430. Flatten a Multilevel Doubly Linked List	Solve	Medium	Amazon+3	Depth-First Search Doubly-Linked List+1
432. All O`one Data Structure	Solve	Hard	Amazon+2	Design Doubly-Linked List+2
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
438. Find All Anagrams in a String	Solve	Medium	Adobe+9	Hash Table Sliding Window+1
441. Arranging Coins	Solve	Easy	Adobe+5	Binary Search Math
442. Find All Duplicates in an Array	Solve	Medium	Adobe+4	Array Hash Table
443. String Compression	Solve	Medium	Amazon+8	String Two Pointers
445. Add Two Numbers II	Solve	Medium	Accenture+49	Linked List Math+1
448. Find All Numbers Disappeared in an Array	Solve	Easy	Amazon+3	Array Hash Table
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
454. 4Sum II	Solve	Medium	Adobe+3	Array Hash Table
456. 132 Pattern	Solve	Medium	Amazon+1	Array Binary Search+3
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
463. Island Perimeter	Solve	Easy	Amazon+2	Array Breadth-First Search+2
465. Optimal Account Balancing	Solve	Hard	Affirm+3	Array Backtracking+3
466. Count The Repetitions	Solve	Hard	Amazon	Dynamic Programming String
468. Validate IP Address	Solve	Medium	Amazon+2	String
470. Implement Rand10() Using Rand7()	Solve	Medium	Amazon+2	Math Probability and Statistics+2
472. Concatenated Words	Solve	Hard	Amazon+1	Array Depth-First Search+3
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
486. Predict the Winner	Solve	Medium	Amazon+4	Array 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
493. Reverse Pairs	Solve	Hard	Amazon	Array Binary Indexed Tree+5
494. Target Sum	Solve	Medium	Adobe+4	Array Backtracking+1
496. Next Greater Element I	Solve	Easy	Adobe+9	Array Hash Table+2
503. Next Greater Element II	Solve	Medium	Adobe+9	Array Monotonic Stack+1
509. Fibonacci Number	Solve	Easy	Adobe+8	Dynamic Programming Math+2
511. Game Play Analysis I	Solve	Easy	Adobe+4	Database
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