Compilare: user.cpp: In function ‘int main()’: user.cpp:27:25: warning: variable ‘l’ set but not used [-Wunused-but-set-variable] int n,k,x,y,r,i,lat,l,c; ^ user.cpp:27:27: warning: variable ‘c’ set but not used [-Wunused-but-set-variable] int n,k,x,y,r,i,lat,l,c; ^ user.cpp:25:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("z.in","r",stdin); ^ user.cpp:26:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("z.out","w",stdout); ^ user.cpp:28:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&k); ^ user.cpp:31:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^