Compilare: user.cpp: In function ‘int main()’: user.cpp:25:17: warning: variable ‘mi’ set but not used [-Wunused-but-set-variable] int n,m,i,j,mi,ma,sq,ng=0; ^ user.cpp:25:20: warning: variable ‘ma’ set but not used [-Wunused-but-set-variable] int n,m,i,j,mi,ma,sq,ng=0; ^ user.cpp:23:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bucket.in","r",stdin); ^ user.cpp:24:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bucket.out","w",stdout); ^ user.cpp:26:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:35:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&inter[i].first,&inter[i].second); ^