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Master Data Structures & Algorithms

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28-Days Challenge

Master Graphs

Build your problem-solving skills one day at a time

18
Solved
42
Total
Day 4
of 28
30:00
Focus Timer
47 submissions in 2026
18 Easy 21 Medium 8 Hard Active: 32 Streak: 7
Jan
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Sep

Graphs

18 / 42
03
Topological Sort
5 problems
Course Schedule
Cycle Detection
Medium
Course Schedule II
Topological Order
Medium
Minimum Height Trees
Tree Center
Medium
Find All Possible Recipes
Topological Sort
Medium
Parallel Courses III
Topo + DP
Hard

Contest

74:30 · 0/4 solved
Implement Stack using Queues
Stack Fundamentals
Easy
All Ancestors in a Directed Acyclic Graph
Topological Sort
Medium
Find Original Array of Prefix XOR
Bit Operations
Medium
Kth Smallest Sum of Matrix With Sorted Rows
K-Way Merge Pattern
Hard
End Contest

Review

1D DP Foundations + Coin Change & Knapsack • 8 problems
House Robber REDO
Skip Pattern
Medium
Decode Ways REDO
Counting
Medium
Coin Change REDO
Unbounded
Medium
Partition Equal Subset Sum NEW
0/1 Knapsack
Medium
Target Sum NEW
Subset Sum
Medium
650+ problems 13 roadmaps 81 topics

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