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社区首页 >专栏 >【LeetCode】617. Merge Two Binary Trees

【LeetCode】617. Merge Two Binary Trees

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韩旭051
发布2019-11-07 23:26:06
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发布2019-11-07 23:26:06
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文章被收录于专栏:刷题笔记

版权声明:本文为博主原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接和本声明。

本文链接:https://blog.csdn.net/shiliang97/article/details/102181597

Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are not.

You need to merge them into a new binary tree. The merge rule is that if two nodes overlap, then sum node values up as the new value of the merged node. Otherwise, the NOT null node will be used as the node of new tree.

Example 1:

Input: Tree 1 Tree 2 1 2 / \ / \ 3 2 1 3 / \ \ 5 4 7 Output: Merged tree: 3 / \ 4 5 / \ \ 5 4 7

Note: The merging process must start from the root nodes of both trees.

来源:力扣(LeetCode) 链接:https://leetcode-cn.com/problems/merge-two-binary-trees 著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。

代码语言:javascript
复制
class Solution {
public:
    TreeNode* mergeTrees(TreeNode* t1, TreeNode* t2) {
        if(t1==NULL&& t2!=NULL) return t2; 
        if(t1 !=NULL&&t2!=NULL){
            t1->val=t1->val+t2->val;
            t1->left = mergeTrees(t1->left,t2->left);
            t1->right = mergeTrees(t1->right,t2->right);
        }
        return t1;
    }
};

这样更快点

代码语言:javascript
复制
class Solution {
public:
    TreeNode* mergeTrees(TreeNode* t1, TreeNode* t2) {
       
        if(t1==NULL&& t2!=NULL){
           return t2;
       } 
        if (t2==NULL&& t1!=NULL){
            return t1;
        }
        if(t1 !=NULL&&t2!=NULL){
            int n=t1->val+t2->val;
            t1->val=n;
            t1->left = mergeTrees(t1->left,t2->left);
            t1->right = mergeTrees(t1->right,t2->right);
        }
        return t1;
    }
};
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