#include <stdio.h>
int main() {
int n = 5;
for (int i = 1, increment = 1; ; ) {
if (i == 0) break;
for (int i2 = 0; i2 < n - i; i2++) printf(" ");
for (int i2 = 0; i2 < (2 * i) - 1; i2++) printf("*");
printf("\n");
if (i == n) increment = -1;
i += increment;
}
}