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C
#include <stdio.h>
int main()
{
int n = 5;
int i,j;
int x = 1, y = n;
int t1,t2;
int r1,r2;
for(i = n; i >= 1; i--)
{
t1 = x;
t2 = y;
r1 = i;
r2 = i + 1;
for (j = n; j >= i; j--)
{
if ((i + j) % 2 == 1)
{
printf("%2d ", t1);
}
else
{
printf("%2d ", t2);
}
t1 = t1 - r1++;
t2 = t2 - r2++;
}
y = y + i - 1;
x = x + i;
printf("\n");
}
return 0;
}