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44 lines
923 B
44 lines
923 B
/**
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* File: preorder_traversal_i_compact.c
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* Created Time: 2023-05-10
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* Author: Gonglja (glj0@outlook.com)
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*/
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#include "../utils/common.h"
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vector *res;
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// 打印向量中的元素
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void printFunc(vector *v, void *p) {
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TreeNode *node = p;
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printf("%d ", node->val);
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}
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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 == NULL) {
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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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vectorPushback(res, root, sizeof(int));
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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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int arr[] = {1, 7, 3, 4, 5, 6, 7};
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res = newVector();
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TreeNode *root = arrToTree(arr, sizeof(arr) / sizeof(arr[0]));
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printf("\n初始化二叉树\r\n");
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printTree(root);
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// 前序遍历
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preOrder(root);
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printf("\n输出所有值为 7 的节点\r\n");
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printVector(res, printFunc);
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delVector(res);
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} |