PROBLEMS/GRAPHS/TOPOLOGICAL SORT

Topological Sort Problems

25 Topological Sort problems on LeetCode, a Graphs interview pattern, ranked by importance (how often it comes up in real interviews). Difficulty (ELO) and importance shown per problem.

#	PROBLEM	DIFF	ELO	IMP	PATTERNS
1	Course Schedule	Medium	1414	92
2	Course Schedule II	Medium	1503	90
3	Alien DictionaryPREMIUM	Hard	1842	88	BFS Shortest Path (Unweighted) · Frequency Counting / Hash Map Lookup
4	Minimum Height Trees	Medium	1748	82	BFS Shortest Path (Unweighted)
5	Build a Matrix With Conditions	Hard	1961	82	Matrix Traversal (Diagonal, Valid Sudoku, etc)

+ 20 more Topological Sort problems, see all in the explorer →

MORE GRAPHS PATTERNS

BFS Shortest Path (Unweighted)Multi-Source BFS DFS Connected Components DFS Path Finding Union-Find Topological Sort

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