关于fhq插入值的问题

void Insert() {
	int nowl, nowr, now;
	pos = read();
	split(root, pos, nowl, nowr);
	cnt = read();
	for (int i = 1; i <= cnt; i++) {
		int x = read();
		create(now, x);
		nowl= merge(nowl, now);
	}
	root = merge(nowl, nowr);
}