Compilare: user.cpp: In function ‘void calcul(const int&)’: user.cpp:18:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < G[nod].size();k++){ ^ user.cpp: In function ‘void vodka(const int&, const int&)’: user.cpp:42:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[nod].size(); i++){ ^ user.cpp: At global scope: user.cpp:51:7: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:66:9: warning: unused variable ‘s’ [-Wunused-variable] int s= 0; ^