anda522 / anda522.github.io

https://wyqz.top
3 stars 0 forks source link

容斥定理 | 行码棋 #22

Open anda522 opened 1 year ago

anda522 commented 1 year ago

https://wyqz.top/p/1292892888.html

# 容斥定理 简单版本:对于上述图片,求$|A\cup B \cup C|$结果为$|A\cup B\cup C|=|A|+|B|+|C|-|A\cap B|-|B\cap C|-|C\cap A|+|A\cap B\cap C|$ 一