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47 lines
998 B
47 lines
998 B
/**
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* File: preorder_traversal_ii_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 *> path;
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vector<vector<TreeNode *>> res;
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/* 前序遍历：例题二 */
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void preOrder(TreeNode *root) {
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if (root == nullptr) {
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return;
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}
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// 尝试
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path.push_back(root);
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if (root->val == 7) {
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// 记录解
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res.push_back(path);
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}
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preOrder(root->left);
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preOrder(root->right);
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// 回退
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path.pop_back();
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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输出所有根节点到节点 7 的路径" << endl;
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for (vector<TreeNode *> &path : res) {
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vector<int> vals;
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for (TreeNode *node : path) {
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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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}
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