Compilare: user.cpp: In function ‘int main()’: user.cpp:118:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(/*rad(k+1)!=rad(k+2)*/fl==false &&i<v.size()){ ^ user.cpp:120:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(fl==false &&v[i].first==raza &&i<v.size()){ ^ user.cpp:92:34: 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:93:36: 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:96:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&m,&n); ^ user.cpp:97:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d",&k); ^ user.cpp:100:46: 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); ^