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40 lines
814 B
40 lines
814 B
/**
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* File: preorder_traversal_i_compact.cpp
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* Created Time: 2023-04-16
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* Author: Krahets (krahets@163.com)
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*/
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#include "../utils/common.hpp"
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vector<TreeNode *> res;
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/* 前序遍历：例题一 */
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static void preOrder(TreeNode *root) {
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if (root == nullptr) {
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return;
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}
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if (root->val == 7) {
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// 记录解
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res.push_back(root);
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}
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preOrder(root->left);
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preOrder(root->right);
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}
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/* Driver Code */
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int main() {
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TreeNode *root = vectorToTree(vector<int>{1, 7, 3, 4, 5, 6, 7});
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cout << "\n初始化二叉树" << endl;
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printTree(root);
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// 前序遍历
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preOrder(root);
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cout << "\n输出所有值为 7 的节点" << endl;
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vector<int> vals;
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for (TreeNode *node : res) {
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vals.push_back(node->val);
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}
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printVector(vals);
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}
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