#include<stdio.h>
int main()
{
int n,i,j,space,sp,it=1;
space=n-1;
for(i=0;i<n;i++)
{
sp=space;
while(sp!=0)
{
sp--;
}
for(j=0;j<=i;j++)
{
it++;
}
space--;
}
return 0;
}
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