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bool is_same(treenode *r1, treenode *r2) {
    if(!r1 && !r2) return true;
    if(!r1 && r2 || r1 && !r2) return false;
    return r1->val == r2->val && 
            is_same(r1->left, r2->left) &&
            is_same(r1->right, r2->right);
}