【LeetCode100】Same Tree

/**
 * 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 isSameTree(TreeNode* p, TreeNode* q) {
        //终止条件
        if(p == NULL || q == NULL)
            return (p == q);
        if(p->val != q->val)
            return false;
        else{
            if(isSameTree(p->left, q->left)){
                if(isSameTree(p->right, q->right))
                    return true;
                else
                    return false;
            }
            else
                return false;
        }
    }
};

LeetCode上别人的简化版

bool isSameTree(TreeNode *p, TreeNode *q) {
    if (p == NULL || q == NULL) return (p == q);
    return (p->val == q->val && isSameTree(p->left, q->left) && isSameTree(p->right, q->right));
}