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C
#include <stdio.h>
int main()
{
int n = 5;
int i,j;
int total = n * 3 - 3;
int p = 1, b = total - n * 2 + 4, h = total;
for(i = 1; i <= n; i++)
{
for (j = 1; j <= i; j++)
{
if (j == 1)
{
printf("%2d ", p++);
}
else if (i == n)
{
printf("%2d ", b++);
}
else if (j == i)
{
printf("%2d ", h--);
}
else
{
printf(" ");
}
}
printf("\n");
}
return 0;
}