__11jiang08__ @ 2022-11-13 14:34:20
HACK数据：
2
-1 -1
-1 -1正确输出：-1
以下三篇题解输出0：
1.https://www.luogu.com.cn/blog/xuwentao/solution-p1719
2.https://www.luogu.com.cn/blog/moli-Hao/solution-p1719
by __11jiang08__ @ 2022-11-13 14:34:42
@chen_zhe
by XieGuiYi_aic @ 2023-06-22 18:41:42
@11jiang08 您猜猜作者为什么这样写。
by XieGuiYi_aic @ 2023-06-22 18:42:16
防抄