#include <stdio.h>void writeX(int n){int i;for(i=0;i<n;i++){printf("X");}printf("\n");} void figure( int n ){ if(n==1){ return writeX(1); } figure(n-1); writeX(n); figure(n-1); } int main(void) {int n;scanf("%d", &n);figure(n);return 0;}
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