二叉树的生成，几种遍历，销毁的c++实现_c++销毁二叉树

#include<iostream>
#include<stdio.h>
#include<vector>
#include<map>
#include<algorithm>
#include<queue>
 
using namespace std;
 
struct TreeNode {
	char val;
	struct TreeNode *left;
	struct TreeNode *right;
 
	TreeNode(char x) :
		val(x), left(NULL), right(NULL) {
	}
};
 
TreeNode* make_tree(){
	TreeNode* A = new TreeNode('A'); TreeNode* B = new TreeNode('B');
	TreeNode* C = new TreeNode('C'); TreeNode* D = new TreeNode('D');
	TreeNode* E = new TreeNode('E'); TreeNode* F = new TreeNode('F');
	TreeNode* G = new TreeNode('G'); TreeNode* H = new TreeNode('H');
	TreeNode* K = new TreeNode('K'); 
	A->left = B;
	A->right = E;
	B->right = C;
	C->left = D;
	E->right = F;
	F->left = G;
	G->left = H;
	G->right = K;
	return A;
}
void delet_tree(TreeNode* head){
	if (head ==