3 line C++ recursive solution


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

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