Изменения

r = tree[node].right;

'''if''' [l, r) <tex>\cap </tex> [a, b) == <tex> \varnothing</tex>

'''if''' [l, r) <tex>\subseteq </tex> [a, b)

tree[node].d = tree[node].d <tex>\odot</tex> val;

push(node);

r = tree[node].right;

'''if''' [l, r )<tex>\cap </tex> [a, b) == <tex> \varnothing</tex>

'''if''' [l, r) <tex>\subseteq </tex> [a, b)

push(node);

int ans = get_ans (node * 2 + 1, a, b) <tex>\oplus</tex>

tree[node].ans = (tree[2 * node + 1].ans <tex>\odot</tex> tree[2 * node + 1].d) <tex>\oplus</tex>

(tree[2 * node + 2].ans <tex>\odot</tex> tree[2 * node + 2].d);

}