二叉树的逆时针螺旋遍历,C++实现?
逆时针螺旋遍历二叉树是找到一颗树的元素,这些元素遍历之后会形成螺旋,但顺序相反。下图展示了二叉树的逆时针螺旋遍历。

在二叉树中进行螺旋遍历的算法以以下方式工作:
初始化变量 i 和 j,并使值等于 i = 0 且 j 等于变量高度。使用一个标记来检查要打印哪部分。标记最初设置为假。一个循环一直运行到 i < j 为止,打印前半部分,否则打印后半部分,并翻转标记值。此过程一直持续到打印整颗二叉树。
示例
#include <bits/stdc++.h>
using namespace std;
struct Node {
struct Node* left;
struct Node* right;
int data;
Node(int data) {
this->data = data;
this->left = NULL;
this->right = NULL;
}
};
int height(struct Node* root) {
if (root == NULL)
return 0;
int lheight = height(root->left);
int rheight = height(root->right);
return max(1 + lheight, 1 + rheight);
}
void leftToRight(struct Node* root, int level) {
if (root == NULL)
return;
if (level == 1)
cout << root->data << " ";
else if (level > 1) {
leftToRight(root->left, level - 1);
leftToRight(root->right, level - 1);
}
}
void rightToLeft(struct Node* root, int level) {
if (root == NULL)
return;
if (level == 1)
cout << root->data << " ";
else if (level > 1) {
rightToLeft(root->right, level - 1);
rightToLeft(root->left, level - 1);
}
}
int main() {
struct Node* root = new Node(1);
root->left = new Node(2);
root->right = new Node(3);
root->left->left = new Node(4);
root->right->left = new Node(5);
root->right->right = new Node(7);
root->left->left->left = new Node(10);
root->left->left->right = new Node(11);
root->right->right->left = new Node(8);
int i = 1;
int j = height(root);
int flag = 0;
while (i <= j) {
if (flag == 0) {
rightToLeft(root, i);
flag = 1;
i++;
} else {
leftToRight(root, j);
flag = 0;
j--;
}
}
return 0;
}输出
1 10 11 8 3 2 4 5 7
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