Apple coding interview questions

74 DSA problems tagged as asked at Apple, with statements, examples and constraints — practise free on CampusCode.

8. Rotate Array by K Steps Easy Array
63. Product of Array Except Self Medium Array
66. Rotate Image (90 Degrees) Medium Array
67. Spiral Matrix Traversal Medium Array
70. Merge Intervals Medium Array
71. Insert Interval Medium Array
79. Two Sum II - Input Array Is Sorted Medium Array
89. Find First and Last Position of Element in Sorted Array Medium Array
102. Array Nesting Medium Array
106. Subarray Product Less Than K Medium Array
112. Best Time to Buy and Sell Stock III Hard Array
119. Best Time to Buy and Sell Stock IV Hard Array
163. Longest Common Prefix Easy String
173. Ransom Note Easy String
174. String Compression (Run-Length Encoding) Easy String
178. Find the Index of the First Occurrence in a String Easy String
208. Decode String (Nested Brackets — Easy Variant) Easy String
212. Group Anagrams Medium String
219. Word Break Medium String
230. Compare Version Numbers Medium String
231. Reverse Words in a String Medium String
233. Basic Calculator II Medium String
234. Decode String Medium String
238. String Compression (Length) Medium String
241. Text Justification (Line Count) Medium String
250. Longest Substring with At Most K Distinct Characters Medium String
259. Regular Expression Matching Hard String
267. Interleaving String Hard String
269. Word Ladder (Shortest Transformation Length) Hard String
285. Integer to English Words Hard String
286. Parse Lisp Expression Hard String
293. Longest Happy Prefix (Length) Hard String
297. Reverse a Linked List Easy Linked List
315. Remove Nth Node from End of List Easy Linked List
360. Reorder List Medium Linked List
361. Odd Even Linked List Medium Linked List
393. Remove Duplicates from Sorted List II Medium Linked List
394. Merge K Sorted Lists (Optimal — Min Heap) Hard Linked List
474. Search a 2D Matrix II (Row & Column Sorted) Easy Binary Search
480. Find K Closest Elements in Sorted Array Medium Binary Search
497. Minimum Speed to Arrive on Time Medium Binary Search
504. Random Pick with Weight (Deterministic Queries) Medium Binary Search
527. Kth Smallest Element in a Sorted Matrix Hard Binary Search
559. Guess the Word (Deterministic Strategy) Hard Binary Search
576. Remove All Adjacent Duplicates in String Easy Stack
588. Number of Recent Calls Easy Stack
612. Decode String (Nested Brackets) Medium Stack
618. Exclusive Time of Functions Medium Stack
622. Task Scheduler (Greedy + Queue) Medium Stack
640. Shortest Path in Binary Matrix Medium Stack
647. Snakes and Ladders Medium Stack
657. Basic Calculator III Hard Stack
680. Sum of Subarray Ranges Hard Stack
757. Permutations II (With Duplicates) Medium Recursion
765. Word Break (Recursive + Memoization) Medium Recursion
766. Flood Fill Algorithm Medium Recursion
791. Partition Equal Subset Sum (Recursive + Memo) Medium Recursion
800. Sudoku Solver (Optimized Backtracking) Hard Recursion
801. Regular Expression Matching (Recursive) Hard Recursion
818. Number of Squareful Arrays Hard Recursion
957. Kth Smallest Element in a Sorted Matrix Hard Trees
989. Number of Islands (DFS) Easy Graphs
997. Shortest Path in Binary Matrix Easy Graphs
999. Island Perimeter Easy Graphs
1023. Redundant Connection Easy Graphs
1032. Cheapest Flights Within K Stops Medium Graphs
1057. Snakes and Ladders Medium Graphs
1061. Keys and Rooms Medium Graphs
1063. Reconstruct Itinerary (Eulerian Path) Medium Graphs
1143. Minimum Falling Path Sum Easy Dynamic Programming
1171. Regular Expression Matching (. and *) Easy Dynamic Programming
1173. Interleaving String Easy Dynamic Programming
1212. Maximum Sum Circular Subarray Medium Dynamic Programming
1348. Number of Squareful Arrays (Bitmask) Medium Bit Manipulation