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Cod sursa(job #963554)
#include <stdio.h>
using namespace std;
int n, i, j, k;
int main()
{
freopen("tije.in", "r", stdin);
freopen("tije.out", "w", stdout);
scanf("%d", &n);
for(i = 1 ; i < n ; ++ i)
{
for(j = n ; j ; -- j)
for(k = 1; k <= i ; ++ k)
printf("%d %d\n", j, j+1);
for(k = 1 ; k <= i ; ++ k)
printf("%d 1\n", n);
}
return 0;
}