Compilare: user.cpp: In function ‘int main()’: user.cpp:64:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<G.size();i++){ ^ user.cpp:72:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<D[i].size();j++){ ^ user.cpp:52:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rrmst.in","r",stdin); ^ user.cpp:53:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rrmst.out","w",stdout); ^ user.cpp:55:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&n); ^ user.cpp:58:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld %ld",&G[i].x,&G[i].y); ^