正解 flow 吧。
by Rubidium_Chloride @ 2022-07-09 21:59:40
输麻了，考场上想网络流，一直不会建图，现在回过头来贪心能过？？？如果是 IOI 赛制或许我还会考虑一下 
by irris @ 2022-07-09 22:00:23
@[BreezeEnder](/user/242543) hack:
```latex
4
-1 -1 100 100
-1 100 100 100
100 100 -1000 -1000
100 100 -1000 -1000
```
答案是498，但程序会输出497
by qiuzx @ 2022-07-09 22:05:36
谁在 cf 的博客下面说几句话（
by irris @ 2022-07-09 22:06:46
@[qiuzx](/user/173935) 抱歉，应该是
```
4 4
-1 -1 100 100
-1 100 100 100
100 100 -1000 -1000
100 100 -1000 -1000
```
by qiuzx @ 2022-07-09 22:23:15
@[qiuzx](/user/173935) 感谢
by Ryo_Yamada @ 2022-07-10 06:49:44