hello-algo/codes/c/chapter_backtracking/preorder_traversal_i_compact.c
2023-10-17 23:45:31 +08:00

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916 B
C

/**
* File: preorder_traversal_i_compact.c
* Created Time: 2023-05-10
* Author: Gonglja (glj0@outlook.com)
*/
#include "../utils/common.h"
vector *res;
// 打印向量中的元素
void printFunc(vector *v, void *p) {
TreeNode *node = p;
printf("%d ", node->val);
}
/* 前序遍历:例题一 */
void preOrder(TreeNode *root) {
if (root == NULL) {
return;
}
if (root->val == 7) {
// 记录解
vectorPushback(res, root, sizeof(int));
}
preOrder(root->left);
preOrder(root->right);
}
/* Driver Code */
int main() {
int arr[] = {1, 7, 3, 4, 5, 6, 7};
res = newVector();
TreeNode *root = arrToTree(arr, sizeof(arr) / sizeof(arr[0]));
printf("\n初始化二叉树\r\n");
printTree(root);
// 前序遍历
preOrder(root);
printf("\n输出所有值为 7 的节点\r\n");
printVector(res, printFunc);
delVector(res);
}