Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < v[nod].size(); i++ ){ ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:40:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < v[nod].size(); i++ ){ ~~^~~~~~~~~~~~~~~ user.cpp:57:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Q.size(); i++ ){ ~~^~~~~~~~~~