Compilare: user.cpp: In function ‘int main()’: user.cpp:77:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l=pbox[j]; l<box[j].size(); ++l) ^ user.cpp:95:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<w[nod].size(); ++i) ^ user.cpp:89:13: warning: unused variable ‘dst’ [-Wunused-variable] int dst, fiu, nod=g.begin()->second; ^ user.cpp:49:36: 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:50:38: 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:52:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:56:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &v[i].first, &v[i].second); ^