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Algorithms Roadmap Problems Articles CS

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Interview-style problems, each with a step-by-step visualizer for when you get stuck.

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Pairs of Songs With Total Durations Divisible by 60

mediumArrayHash TableCounting

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216 of 216 problemsBrowse by company

StatusProblemDifficultySave

1.Binary Search
ArrayBinary Search
15 companies
easy
2.Invert Binary TreeVizEditorial
TreeBFSDFS
11 companies
easy
3.Valid PalindromeEditorial
Two PointersString
21 companies
easy
4.Min Size Subarray Sum
Sliding WindowArray
13 companies
medium
7.LCA of a BST
TreeBST
medium
8.Number of IslandsEditorial
GraphBFSDFS
51 companies
medium
9.Climbing StairsEditorial
Dynamic Programming
17 companies
easy
10.0/1 Knapsack
Dynamic Programming
medium
11.Implement TrieVizEditorial
TrieDesign
17 companies
medium
12.Valid ParenthesesVizEditorial
StackString
61 companies
easy
13.Minimum Add to Make Parentheses ValidViz
StackGreedy
8 companies
medium
14.Next Greater Element IViz
StackMonotonic Stack
9 companies
easy
15.Daily TemperaturesViz
StackMonotonic Stack
16 companies
medium
16.Online Stock SpanViz
StackMonotonic StackDesign
8 companies
medium
17.Koko Eating BananasViz
Binary SearchBinary Search On Answer
16 companies
medium
18.Capacity to Ship Packages within D DaysViz
Binary SearchBinary Search On Answer
13 companies
medium
19.Find the Smallest Divisor Given a ThresholdViz
Binary SearchBinary Search On Answer
6 companies
medium
20.Search in Rotated Sorted ArrayVizEditorial
Binary Search
34 companies
medium
21.Find Minimum in Rotated Sorted ArrayVizEditorial
Binary Search
17 companies
medium
22.Find Target in ArrayViz
Linear SearchArray
easy
23.First Bad VersionViz
Binary SearchBinary Search On Answer
15 companies
easy
24.Search Insert PositionViz
Binary SearchArray
13 companies
easy
25.Path SumViz
TreeDFS
10 companies
easy
26.Path Sum IIViz
TreeDFSBacktracking
12 companies
medium
27.Lowest Common Ancestor of a Binary TreeViz
TreeDFSRecursion
31 companies
medium
28.Lowest Common Ancestor of a Binary Search TreeVizEditorial
TreeBST
12 companies
easy
29.Binary Tree Inorder TraversalViz
TreeDFSRecursion
10 companies
easy
30.Maximum Depth of Binary TreeVizEditorial
TreeBFSDFS
13 companies
easy
31.Binary Tree Level Order TraversalVizEditorial
TreeBFSQueue
15 companies
medium
32.Print Right-Angled TriangleViz
Nested LoopsStar Pattern
easy
33.Print PyramidViz
Nested LoopsStar Pattern
easy
34.Print DiamondViz
Nested LoopsStar Pattern
medium
35.Print ButterflyViz
Nested LoopsStar Pattern
medium
36.Bubble Sort an ArrayViz
SortingBubble Sort
easy
37.Selection Sort an ArrayViz
SortingSelection Sort
easy
38.Insertion Sort an ArrayViz
SortingInsertion Sort
easy
39.Number of Recent CallsViz
QueueSliding Window
2 companies
easy
40.Implement Queue using StacksViz
QueueStackDesign
12 companies
easy
41.Middle of the Linked ListViz
Linked ListTwo Pointers
14 companies
easy
42.Merge Two Sorted ListsVizEditorial
Linked ListTwo Pointers
25 companies
easy
43.Reverse Linked ListVizEditorial
Linked List
29 companies
easy
44.Linked List CycleVizEditorial
Linked ListTwo PointersCycle Detection
16 companies
medium
45.Two SumVizEditorial
Hash MapArray
68 companies
easy
46.Valid AnagramVizEditorial
Hash MapString
24 companies
easy
47.Group AnagramsVizEditorial
Hash MapStringGrouping
44 companies
medium
48.Add Two NumbersEditorial
Linked ListMathRecursion
27 companies
medium
49.Longest Substring Without Repeating CharactersEditorial
Hash TableStringSliding Window
54 companies
medium
50.Median of Two Sorted ArraysEditorial
ArrayBinary SearchDivide And Conquer
33 companies
hard
51.Longest Palindromic SubstringEditorial
Two PointersStringDynamic ProgrammingManacher
39 companies
medium
52.Reverse Integer
Math
18 companies
medium

1 to 50 of 216

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