[leetcode]same-tree

比較tree是否相同

思路

遞迴走起

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Solution 1

/**
 * Definition for binary tree
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Solution {
public:
    bool isSameTree(TreeNode *p, TreeNode *q) {
        if(p!=nullptr&&q!=nullptr&&p->val==q->val){ //neither null
            //左右子樹都相同
            if(isSameTree(p->left,q->left)&&isSameTree(p->right,q->right)){
                return true;
            }
        }else if(p==nullptr&&q==nullptr){//both null
            return true;
        }else{
            return false;
        }

    }
};