Compilare: user.cpp: In function ‘int main()’: user.cpp:22:18: warning: unused variable ‘zone’ [-Wunused-variable] int n,k,p,i,l,c,zone,q,l1,c1; ^ user.cpp:22:25: warning: unused variable ‘l1’ [-Wunused-variable] int n,k,p,i,l,c,zone,q,l1,c1; ^ user.cpp:22:28: warning: unused variable ‘c1’ [-Wunused-variable] int n,k,p,i,l,c,zone,q,l1,c1; ^ user.cpp:23:27: 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:24:29: 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:25:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:34:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&l,&c); ^