#include <iostream>
using namespace std;
int main() {
int i,j ;
i,j=0;
for(j = 0; j < 20; j++)
{
for (i=0; i <= 20 -j; i++) cout << " ";
for(i = 0; i < j; i++) cout << "X";
cout << endl;
}
return 0;
}
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