Free Courses
DSA Problems
TitleTopicsAcceptanceSolutionDifficulty
1. Detect Loop in linked list

Linked List

43.49% Medium
2. Palindrome Linked List

Linked List

41.48% Medium
3. Categorize even and odd nodes in a Linked List

Linked List

49.80% Medium
4. Check for balanced Paranthesis

Stack

28.56% Easy
5. Asteroid Collision

Stack

50.06% Medium
6. Convert Infix To Prefix Notation

Stack

52.94% Medium
7. Histogram Max Rectangular Area

Stack

32.12% Hard
8. Implement Queue using Arrays

Queue

47.24% Basic
9. Minimum Cost of Ropes

Queue

42.73% Medium
10. Heap Sort

Heap

53.06% Medium
11. Word Search

Recursion

32.69% Medium
12. Print Pattern

Recursion

56.39% Easy
13. Floor in a Sorted Array

Sorting Algorithms

33.75% Easy
14. Minimum sum

Array

Sorting Algorithms

17.14% Medium
15. Number of Pairs

Array

21.82% Medium
16. Find Transition Point

Array

Searching Algorithms

37.90% Easy
17. Super Primes

Searching Algorithms

24.90% Medium
18. Pair Sum Closest to 0

Searching Algorithms

19.61% Easy
19. Bitonic Point

Searching Algorithm

58.67% Easy
20. Alien Dictionary

String

47.81% Hard
21. Find the String

String

72.98% Hard
22. Lowest Common Ancestor of a Binary Tree

Tree

50.00% Medium
23. Binary Tree Maximum Path Sum

Tree

50.00% Hard
24. 0-1 Knapsack Problem

Array

Dynamic Programming

50.00% Medium
25. Rod Cutting

Array

Dynamic Programming

50.00% Medium
26. Stock buy and sell

Array

Dynamic Programming

29.18% Medium
27. Maximum Meetings in One Room

Array

Sorting Algorithms

33.57% Medium
28. Subset Sums

Recursion

72.55% Medium
29. Game with String

Heap

53.96% Medium
30. Interleave the First Half of the Queue with Second Half

Queue

69.35% Medium
31. Merge Sort for Linked List

Linked List

74.76% Medium
32. Reverse a Linked List in Groups

Linked List

57.08% Medium
33. Intersection of Two Linked Lists

Linked List

35.30% Easy
34. Reverse Words In A String

String

47.80% Easy
35. First Occurrence In A String

String

50.08% Medium
36. Distinct Paths II

Array

Recursion

Dynamic Programming

2D Array

50.00% Medium
37. Minimum Path Sum

Array

Dynamic Programming

2D Array

50.00% Medium
38. Distinct Paths

Array

Recursion

Dynamic Programming

2D Array

50.00% Medium
39. Longest Increasing Subsequence

Array

Dynamic Programming

20.00% Medium
40. Longest Common Subsequence

Array

String

Dynamic Programming

50.00% Medium
41. Number of Turns in Binary Tree

Tree

50.00% Hard
42. Find Largest Value in Each Tree Row

Tree

50.00% Medium
43. Tree Path Sum

Tree

50.00% Medium
44. Cake Distribution Problem

Array

Searching Algorithms

64.62% Hard
45. Level Order Traversal of Binary Tree

Tree

50.00% Medium
46. Inorder Traversal Of Binary Tree

Tree

50.00% Easy
47. Preorder Traversal Of Binary Tree

Tree

50.00% Easy
48. Postorder Traversal Of Binary Tree

Tree

50.00% Easy
49. Height of Binary Tree

Tree

50.00% Easy
50. Same Binary Tree

Tree

50.00% Easy
51. Maximum Width of Binary Tree

Tree

50.00% Easy
52. Mirror Binary Tree

Tree

50.00% Easy
53. Search Insert Position

Array

Sorting Algorithms

48.03% Easy
54. 3 Sum

Array

Sorting Algorithm

35.80% Medium
55. K-Pangrams

String

Hashing

20.91% Medium
56. Winner of an election

String

Hashing

53.75% Easy
57. Making A Large Island

Graph

BFS

DFS

52.36% Hard
58. Stepping Numbers

BFS

DFS

48.44% Medium
59. Course Schedule

Graph

BFS

DFS

51.77% Medium
60. You and your books

Array

Dynamic Programming

50.00% Easy
61. Maximize dot product

Dynamic Programming

13.27% Medium
62. Next Smallest Palindrome

Array

19.63% Hard
63. Count Smaller elements

Array

38.16% Hard
64. Redundant Parenthesis

String

Stack

51.49% Hard
65. Smallest factorial number

Searching Algorithms

38.79% Medium
66. Insertion Sort

Sorting Algorithms

66.61% Easy
67. Quick Sort

Sorting Algorithms

55.23% Medium
68. Shop in Candy Store

Sorting Algorithms

45.43% Easy
69. Tower of Hanoi

Recursion

35.23% Medium
70. Power Of Numbers

Recursion

20.22% Medium
71. Binary Heap Operations

Heap

22.30% Medium
72. Kth largest element

Heap

64.92% Medium
73. Sort a stack

Recursion

69.19% Medium
74. Reverse First K elements of Queue

Queue

81.28% Medium
75. First non-repeating in a stream

Queue

31.65% Medium
76. Queue using Linked List

Queue

45.60% Easy
77. Implement Min Stack

Stack

22.59% Medium
78. Number of NGEs to the right

Stack

56.74% Medium
79. Implement Stack using Linked List

Stack

53.98% Easy
80. Implement Stack Using Array

Stack

54.76% Basic
81. Flattening a Linked List

Linked List

51.53% Medium
82. Kth from End of Linked List

Linked List

47.30% Medium
83. Merge Two Sorted Lists

Linked List

65.70% Medium
84. Reverse a Linked List

Linked List

78.10% Easy
85. Roman Number to Integer

String

43.21% Easy
86. Longest Palindromic Substring

String

34.80% Medium
87. Remove Duplicates From A String

String

Stack

61.68% Easy
88. Find Kth Rotation

Array

Stack

Searching Algorithm

23.16% Easy
89. Merge Sorted Arrays

Array

Sorting Algorithms

32.01% Easy
90. 2Sum - Pair With Given Sum

Array

Hashing

Hashmap

30.61% Easy
91. Missing In Array

Array

Searching Algorithms

29.59% Easy
92. Maximum Product Of Two Numbers

Array

Sorting Algorithms

81.34% Basic
93. Maximum Subarray Sum

Array

36.28% Medium
94. Strings Rotations

String

43.83% Medium
95. Unique Permutations

String

46.50% Medium
96. Missing And Repeating

Array

24.83% Easy
97. Search In Rotated Sorted Array

Array

Searching Algorithms

37.64% Medium
98. Form Anagram Groups

String

Hashing

69.80% Medium
99. Longest Common Prefix

Array

String

44.20% Easy
100. Count Inversions

Array

Sorting Algorithms

16.93% Medium
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