#include<stdio.h>
int main()
{
int n,a,b,c;
n=n-1;
int w=n*2-2;
for(a=0;a<n;a++)
{
for(b=0;b<n-a;b++)
{
}
//printf("+");
for(c=0;c<2*a-1;c++)
{
}
if(c!=0)
{
}
}
for(a=0;a<n;a++)
{
for(b=0;b<a;b++)
{
}
for(c=0;c<w-(2*a-1);c++)
{
}
}
return 0;
}
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