Compilare: user.cpp: In function ‘int main()’: user.cpp:75:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(rad(k+1)!=rad(k+2) &&i<v.size()){ ^ user.cpp:77:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(v[i].first==raza &&i<v.size()){ ^ user.cpp:51:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("hallway.in","r",stdin); ^ user.cpp:52:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("hallway.out","w",stdout); ^ user.cpp:55:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&m,&n); ^ user.cpp:56:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d",&k); ^ user.cpp:59:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&col[i].first,&col[i].second); ^