The meaning of the question: https://codeforc.es/contest/1217/problem/D Give you a directed graph, which requires no edges of the same color in a loop, ask How do you dye it in at least a few color
The meaning of the question: https://codeforc.es/contest/1217/problem/D Give you a directed graph, which requires no edges of the same color in a loop, ask How do you dye it in at least a few color