isSameTree.cpp

class Solution {
public:
    bool isSameTree(TreeNode* p, TreeNode* q) {
        if (p==NULL && q==NULL) return true;
        if ((p == NULL && q!=NULL) ||(q == NULL && p!=NULL)) return false;
        return (p->val == q->val) && isSameTree(p->left, q->left) && isSameTree(p->right, q->right);
    }
};