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Cod sursa(job #45011)
#include<stdio.h>
#include<stdlib.h>
#define mod 1048575
FILE *f=fopen("12perm.in","r"), *g=fopen("12perm.out","w");
int n,i,d1,d2,d3,d,j;
int main()
{
fscanf(f,"%d",&n);
fclose(f);
i=5;
j=3;
d3=2;
d2=6;
d1=12;
while(i<=n)
{ d=(d3+d1+2*j);
d3=d2;
d2=d1;
d1=d;
d&=mod;
d1&=mod;
d2&=mod;
d3&=mod;
j++;
i++;
}
fprintf(g,"%d\n",d);
fclose(g);
return 0;
}