Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:22:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < F[x].size(); i++ ) { ^ user.cpp: In function ‘int main()’: user.cpp:60:27: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘long long int’ [-Wformat=] printf("%d\n", sol); ^