Compilare: user.cpp: In function ‘int main()’: user.cpp:69:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<e.second.v.size();++i) ^ user.cpp: In function ‘int has(kor, kor)’: user.cpp:35:1: warning: control reaches end of non-void function [-Wreturn-type] } ^