Compilare: user.cpp: In function ‘void calcul(const int&)’: user.cpp:20:44: 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:47:36: 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:56:7: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:70:11: warning: unused variable ‘i’ [-Wunused-variable] int s,i = 0; ^ user.cpp:73:14: warning: ‘s’ may be used uninitialized in this function [-Wmaybe-uninitialized] fout << s; ^