Compilare: user.cpp: In function ‘int main()’: user.cpp:139:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1; j < w[i].size(); j++){ ^ user.cpp:159:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < v[nod].size(); j++){ ^ user.cpp: In function ‘int cautbin(std::pair<double, double>)’: user.cpp:61:1: warning: control reaches end of non-void function [-Wreturn-type] } ^