100. Same Tree

Given two binary trees, write a function to check if they are equal or not.
Two binary trees are considered equal if they are structurally identical and the nodes have the same value.

題意沒有什麼，就是要你檢查兩棵tree是不是一樣的。

懶得講了 直接貼code一下就了解了...

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