3.3-1933 problem A

#include <stdio.h>
int main(void){
    int h;
    while(scanf("%d", &h) != EOF){
    int a = h + 2 * (h-1);
   
    for(int i=0; i<h; i++){
        for(int k = 0; k < a - (h + 2 * i); k++) printf(" ");
        for(int j = 0 ; j < h + 2 * i; j++) printf("*");
        printf("\n");
    }
}
    return 0;

}