Number (0): Everything in this space must add up to 0. The answer is 4-0, placed horizontally; 0-0, placed horizontally; 0-2, placed vertically.
// 数组完全有序，直接返回0
，这一点在im钱包官方下载中也有详细论述
50MP main, 12MP ultrawide, 10MP 3x telephoto。业内人士推荐服务器推荐作为进阶阅读
Фото: Jacek Marczewski/Agencja Wyborcz / Reuters