Problem 1169. Count the Number of Directed Cycles in a Graph

Given an asymmetric adjacency matrix, determine the number of unique directed cycles.
For example, the graph represented by adjacency matrix
A = [
0 1 1 0;
1 1 0 1;
1 0 0 1;
1 1 0 0];
has 7 cycles. They are:
[2 -> 2]
[1 -> 2 -> 1]
[1 -> 3 -> 1]
[2 -> 4 -> 2]
[1 -> 2 -> 4 -> 1]
[1 -> 3 -> 4 -> 1]
[1 -> 3 -> 4 -> 2 -> 1]
The input is an adjacency matrix of 0s and 1s, and the output should be the number of unique (simple) directed cycles in the graph.
Solve

Solution Stats

32.84% Correct | 67.16% Incorrect
Last Solution submitted on Dec 22, 2025

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