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Cod sursa(job #344968)
#include <stdio.h>
FILE *f,*s;
int n;
int main()
{
f=fopen("12perm.in","r");
s=fopen("12perm.out","w");
fscanf(f,"%d",&n);
int a=2;
int b=6;
int c=12;
int d;
for(int i=5;i<=n;++i)
{
d=c+a+2*(i-2);
d-=1048576*(d/1048576);
a=b;
b=c;
c=d;
}
if(n==2)
fprintf(s,"2");
if(n==3)
fprintf(s,"6");
if(n==4)
fprintf(s,"12");
if(n>4)
fprintf(s,"%d",d);
fclose(s);
return 0;
}