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
2. Add Two Numbers	Solve	Medium	Adobe+14	Linked List Math+1
3. Longest Substring Without Repeating Characters	Solve	Medium	Adobe+20	Hash Table Sliding Window+1
5. Longest Palindromic Substring	Solve	Medium	Accenture+50	Dynamic Programming String+1
6. Zigzag Conversion	Solve	Medium	Adobe+2	String
7. Reverse Integer	Solve	Medium	Adobe+10	Math
8. String to Integer (atoi)	Solve	Medium	Adobe+8	String
11. Container With Most Water	Solve	Medium	Adobe+8	Array Greedy+1
12. Integer to Roman	Solve	Medium	Adobe+8	Hash Table Math+1
15. 3Sum	Solve	Medium	Adobe+21	Array Sorting+1
16. 3Sum Closest	Solve	Medium	Adobe+6	Array Sorting+1
17. Letter Combinations of a Phone Number	Solve	Medium	Airtel+34	Backtracking Hash Table+1
18. 4Sum	Solve	Medium	Adobe+8	Array Sorting+1
19. Remove Nth Node From End of List	Solve	Medium	Amazon+7	Linked List Two Pointers
22. Generate Parentheses	Solve	Medium	Adobe+12	Backtracking Dynamic Programming+1
24. Swap Nodes in Pairs	Solve	Medium	Adobe+5	Linked List Recursion
29. Divide Two Integers	Solve	Medium	Adobe+6	Bit Manipulation Math
31. Next Permutation	Solve	Medium	Adobe+19	Array Two Pointers
33. Search in Rotated Sorted Array	Solve	Medium	Accenture+91	Array Binary Search
34. Find First and Last Position of Element in Sorted Array	Solve	Medium	Adobe+18	Array Binary Search
36. Valid Sudoku	Solve	Medium	Amazon+9	Array Hash Table+1
38. Count and Say	Solve	Medium	Adobe+6	String
39. Combination Sum	Solve	Medium	Adobe+8	Array Backtracking
40. Combination Sum II	Solve	Medium	Amazon+4	Array Backtracking
43. Multiply Strings	Solve	Medium	Adobe+5	Math Simulation+1
45. Jump Game II	Solve	Medium	Adobe+9	Array Dynamic Programming+1
46. Permutations	Solve	Medium	Accenture+39	Array Backtracking
47. Permutations II	Solve	Medium	Amazon+1	Array Backtracking
48. Rotate Image	Solve	Medium	Adobe+9	Array Math+1
49. Group Anagrams	Solve	Medium	Adobe+23	Array Hash Table+2
50. Pow(x, n)	Solve	Medium	Adobe+29	Math Recursion
53. Maximum Subarray	Solve	Medium	Adobe+22	Array Divide and Conquer+1
54. Spiral Matrix	Solve	Medium	Accenture+21	Array Matrix+1
55. Jump Game	Solve	Medium	Amazon+8	Array Dynamic Programming+1
56. Merge Intervals	Solve	Medium	Adobe+24	Array Sorting
57. Insert Interval	Solve	Medium	Amazon+4	Array
59. Spiral Matrix II	Solve	Medium	Amazon+3	Array Matrix+1
61. Rotate List	Solve	Medium	Bloomberg+1	Linked List Two Pointers
62. Unique Paths	Solve	Medium	Accoloite+41	Combinatorics Dynamic Programming+1
63. Unique Paths II	Solve	Medium	Amazon+19	Array Dynamic Programming+1
64. Minimum Path Sum	Solve	Medium	Amazon+8	Array Dynamic Programming+1
71. Simplify Path	Solve	Medium	Amazon+3	Stack String
72. Edit Distance	Solve	Medium	Amazon+7	Dynamic Programming String
73. Set Matrix Zeroes	Solve	Medium	Amazon+4	Array Hash Table+1
74. Search a 2D Matrix	Solve	Medium	Accenture+23	Array Binary Search+1
75. Sort Colors	Solve	Medium	Adobe+9	Array Sorting+1
77. Combinations	Solve	Medium	Adobe+7	Backtracking
78. Subsets	Solve	Medium	Adobe+9	Array Backtracking+1
79. Word Search	Solve	Medium	Amazon+8	Array Backtracking+2
80. Remove Duplicates from Sorted Array II	Solve	Medium	Adobe	Array Two Pointers
81. Search in Rotated Sorted Array II	Solve	Medium	Adobe+4	Array Binary Search