same-tree.cpp

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
 *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
 *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
 * };
 */
class Solution {
    public:
        bool isSameTree(TreeNode* p, TreeNode* q) {
            if(p==NULL && q==NULL){
                return true;
            }
             if (p == NULL || q == NULL) {
                return false;
            }
            if(p->val == q->val){
                return isSameTree(p->left,q->left) && isSameTree(p->right,q->right);;
            }
           return false;
        }
    };