Compilare: main.cpp:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated] #import<cstdio> ^~~~~~ main.cpp:2:29: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] int n,i,a=2,b=6,c=12,d;main(){freopen("12perm.in","r",stdin);freopen("12perm.out","w",stdout);scanf("%d",&n);for(i=5;i<=n;i++)d=c,c=(c+a+2*(i-2))&1048575,a=b,b=d;printf("%d",c);} ^ main.cpp: In function 'int main()': main.cpp:2:61: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] int n,i,a=2,b=6,c=12,d;main(){freopen("12perm.in","r",stdin);freopen("12perm.out","w",stdout);scanf("%d",&n);for(i=5;i<=n;i++)d=c,c=(c+a+2*(i-2))&1048575,a=b,b=d;printf("%d",c);} ^ main.cpp:2:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] int n,i,a=2,b=6,c=12,d;main(){freopen("12perm.in","r",stdin);freopen("12perm.out","w",stdout);scanf("%d",&n);for(i=5;i<=n;i++)d=c,c=(c+a+2*(i-2))&1048575,a=b,b=d;printf("%d",c);} ^ main.cpp:2:109: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int n,i,a=2,b=6,c=12,d;main(){freopen("12perm.in","r",stdin);freopen("12perm.out","w",stdout);scanf("%d",&n);for(i=5;i<=n;i++)d=c,c=(c+a+2*(i-2))&1048575,a=b,b=d;printf("%d",c);} ^