Compilare: user.cpp: In function ‘int solve(int, int)’: user.cpp:20:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < G[nod].size(); i++ ){ ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:42:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < G[i].size(); j++ ){ ~~^~~~~~~~~~~~~