Compilare: user.cpp: In function ‘int GetDist(int, int)’: user.cpp:22:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<S[x].size();i++) ^ user.cpp:23:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<S[y].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:42:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<S.size();i++) ^