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#include <bits/stdc++.h>
using namespace std;
int main() {
// 1、 二叉树
// a,b,c,d,e为二叉树，f不是二叉树
// 2、完美二叉树(满二叉树)
// b,e是完美二叉树; a,c,d,f不是完美二叉树
// 3、完全二叉树
// c是完全二叉树，a,d,f不是完全二叉树,b和e完美二叉树
return 0;
}
