Compilare: main.cpp: In function 'bool dfs(int, int)': main.cpp:18:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < edges[node].size(); ++i ) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:85:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < sol.size(); ++i ) ~~^~~~~~~~~~~~