Compilare: user.cpp: In function ‘int main()’: user.cpp:28:17: warning: variable ‘xi’ set but not used [-Wunused-but-set-variable] int t,n,x,y,xi,yi,maxi; ^ user.cpp:28:20: warning: variable ‘yi’ set but not used [-Wunused-but-set-variable] int t,n,x,y,xi,yi,maxi; ^ user.cpp:26:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(IN); ^ user.cpp:27:17: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OUT); ^ user.cpp:30:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:33:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:35:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].x,&v[i].y); ^