全場首殺
**snow**
---
A 題解
brute force $O(n^3)$
$O(n)$?
----
A首殺
**snow**
---
B題解
略
----
B首殺
**flyotlin**
---
C題解
(n * m + 1) / 2
----
C首殺
**snow**
---
D 題解
---
E
uayd
uxxd
3
a x 8
x y 13
d c 3
---
http://contest2019.icpc.tw/final-scoreboard/
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