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