Изменения
→query
'''if''' [l, r ) <tex>\cap </tex> [a, b) == <tex> \varnothing</tex>
'''return''' <tex>\perp</tex>;
'''if''' [l, r) <tex>\subset </tex> [a, b)
'''return''' tree[node].ans <tex>\odot</tex> tree[node].d;
push(node);
