#include <iostream>
#include <iterator>
#include <cstdlib>
int main() {
using namespace std;
const int n = 5;
auto out = ostream_iterator<const char*>(cout," ");
for(int i = 0; i != n; ++i) {
auto width = n - abs(i - n/2);
fill_n(out, n-width, " ");
fill_n(out, width, " * ");
cout << "\n";
}
}
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