voidrecursive_gugu(int,int,int);#include<stdio.h>int main (){recursive_gugu(9,9,9);}voidrecursive_gugu(int n,int m,int len){if(!(n -1))return;if(!m){recursive_gugu(n -1, len, len);return;}recursive_gugu(n, m -1, len);printf("%d * %d = %d\n", n, m, n * m);}
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