100-Same Tree.cpp

/*
@: 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. 

From <https://leetcode.com/problems/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) {
        if(p==NULL || q==NULL ) return (p==q);
        return ((p->val == q->val)&& isSameTree(p->right,q->right)&& isSameTree(p->left,q->left));
    }
};