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
51. N-Queens	Solve	Hard	Adobe+7	Array Backtracking
52. N-Queens II	Solve	Hard	Bytedance+1	Backtracking
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
58. Length of Last Word	Solve	Easy	Amazon+1	String
59. Spiral Matrix II	Solve	Medium	Amazon+3	Array Matrix+1
60. Permutation Sequence	Solve	Hard	Adobe+1	Math Recursion
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
65. Valid Number	Solve	Hard	Facebook+1	String
66. Plus One	Solve	Easy	Adobe+5	Array Math
67. Add Binary	Solve	Easy	Adobe+5	Bit Manipulation Math+2
68. Text Justification	Solve	Hard	Adobe+25	Array Simulation+1
69. Sqrt(x)	Solve	Easy	Adobe+6	Binary Search Math
70. Climbing Stairs	Solve	Easy	Adobe+8	Dynamic Programming Math+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
76. Minimum Window Substring	Solve	Hard	Adobe+9	Hash Table Sliding Window+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
82. Remove Duplicates from Sorted List II	Solve	Medium	Amazon+2	Linked List Two Pointers
83. Remove Duplicates from Sorted List	Solve	Easy	Adobe+4	Linked List
84. Largest Rectangle in Histogram	Solve	Hard	Adobe+7	Array Monotonic Stack+1
85. Maximal Rectangle	Solve	Hard	Amazon+2	Array Dynamic Programming+3
86. Partition List	Solve	Medium	Adobe+8	Linked List Two Pointers
87. Scramble String	Solve	Hard	Yahoo	Dynamic Programming String
88. Merge Sorted Array	Solve	Easy	Amazon+9	Array Sorting+1
89. Gray Code	Solve	Medium	Amazon	Backtracking Bit Manipulation+1
90. Subsets II	Solve	Medium	Adobe+3	Array Backtracking+1
91. Decode Ways	Solve	Medium	Amazon+8	Dynamic Programming String
92. Reverse Linked List II	Solve	Medium	1218 Global+122	Linked List
93. Restore IP Addresses	Solve	Medium	Amazon+6	Backtracking String
94. Binary Tree Inorder Traversal	Solve	Easy	Adobe+13	Binary Tree Depth-First Search+2
95. Unique Binary Search Trees II	Solve	Medium	Adobe+14	Backtracking Binary Search Tree+3
96. Unique Binary Search Trees	Solve	Medium	Amazon	Binary Search Tree Binary Tree+3
97. Interleaving String	Solve	Medium	Amazon+23	Dynamic Programming String
98. Validate Binary Search Tree	Solve	Medium	Adobe+8	Binary Search Tree Binary Tree+2
99. Recover Binary Search Tree	Solve	Medium	Adobe+5	Binary Search Tree Binary Tree+2
100. Same Tree	Solve	Easy	Amazon+5	Binary Tree Breadth-First Search+2