分析
isSsubStructure遍历A树,与B树做匹配
recur从A树当前节点与B树的每个节点做匹配,当B为空的时候说明匹配完成,当A、B当前节点的值不相等时匹配失败,否则继续匹配左右节点
作者:Luna_
链接:https://leetcode-cn.com/problems/shu-de-zi-jie-gou-lcof/solution/26er-cha-shu-by-luna_-28ki/
来源:力扣(LeetCode)
著作权归作者所有。商业转载请联系作者获得授权,非商业转载请注明出处。
/**
* Definition for a binary tree node.
* struct TreeNode {
* int val;
* TreeNode *left;
* TreeNode *right;
* TreeNode(int x) : val(x), left(NULL), right(NULL) {}
* };
*/
class Solution {
public:
bool isSubStructure(TreeNode* A, TreeNode* B) {
return A&&B&&(recur(A,B)||(isSubStructure(A->left,B))||isSubStructure(A->right,B));
}
bool recur(TreeNode* A, TreeNode* B){
if(!B)return true;
if(!A||A->val!=B->val)return false;
return recur(A->left,B->left)&&recur(A->right,B->right);
}
};