100.Same Tree

Given two binary trees, write a function to check if they are the same or not.

Two binary trees are considered the same if they are structurally identical and the nodes have the same value.

Example 1:

Input:     1         1
          / \       /          2   3     2   3

        [1,2,3],   [1,2,3]

Output: true
Example 2:

Input:     1         1
          /                    2             2

        [1,2],     [1,null,2]

Output: false
Example 3:

Input:     1         1
          / \       /          2   1     1   2

        [1,2,1],   [1,1,2]

Output: false

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     struct TreeNode *left;
 *     struct TreeNode *right;
 * };
 */
bool isSameTree(struct TreeNode* p, struct TreeNode* q) {
   
   if(!p && !q)
       return true;
    if(!p || !q)
        return false;
    if(p->val != q->val)
        return false;
    return isSameTree(p->left,q->left) && isSameTree(p->right,q->right);
    
}