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Cod sursa(job #778357)
#include <cstdio>
#include <cstdlib>
#include <cmath>
using namespace std;
#define MOD 1048575
int x1, x2, x3, x4, x5, n;
int main()
{
freopen("12perm.in", "r", stdin);
freopen("12perm.out", "w", stdout);
int i;
scanf("%i", &n);
x1 = 1, x2 = 2, x3 = 6, x4 = 12;
switch(n)
{
case 1:
{
printf("1\n");
return 0;
}
case 2:
{
printf("2\n");
return 0;
}
case 3:
{
printf("6\n");
return 0;
}
case 4:
{
printf("12\n");
return 0;
}
}
for(i = 5; i <= n; i++)
{
x5 = (x4 + x2 + (i - 2) * 2) & MOD;
x2 = x3;
x3 = x4;
x4 = x5;
}
printf("%i\n", x4);
return 0;
}