Graph + Topological Sort

Engineering Articles & Deep Dives

Graph Pattern and most asked problems like Number of Islands, Clone Graph, Course Schedule, Dijkstra, and Network Delay Time.

All Array / String Array + HashMap Sliding Window Two Pointer Linked List Binary Search Stack Matrix Trees DFS/BFS + BST Backtracking Heap and Priority Queue Graph + Topological Sort Dynamic Programming Prefix Sum Greedy Interval Divide and Conquer Union-Find (Disjoint Set Union) Trie Bit Manipulation Math / Number Theory
Graph + Topological Sort
Number of Islands [Easy]
24 Aug 2026 2 min read
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Graph + Topological Sort
Number of Provinces [Medium]
21 Sep 2026 2 min read
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Graph + Topological Sort
Rotting Oranges [Medium]
22 Sep 2026 3 min read
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Graph + Topological Sort
Keys and Rooms [Medium]
21 Sep 2026 2 min read
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Graph + Topological Sort
Number of Connected Components in an Undirected Graph [Medium]
25 Aug 2026 3 min read
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Graph + Topological Sort
Reorder Routes to Make All Paths Lead to the City Zero [Medium]
26 Sep 2026 2 min read
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Graph + Topological Sort
Graph Valid Tree [Medium]
25 Aug 2026 4 min read
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Graph + Topological Sort
Clone Graph [Medium]
25 Aug 2026 3 min read
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Graph + Topological Sort
Pacific Atlantic Water Flow [Medium]
25 Aug 2026 3 min read
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Graph + Topological Sort
Course Schedule [Medium]
25 Aug 2026 4 min read
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Graph + Topological Sort
Dijkstra's Algorithm [Medium]
25 Aug 2026 3 min read
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Graph + Topological Sort
Alien Dictionary [Hard]
25 Aug 2026 5 min read
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