Path in Matrix - 1point3acres


matrix里的路径和必经点问题
面筋高频，给个grid，从左下走到右下角，只能往右走（↗️，➡️，↘️），问有多少条路径。 

follow-up：
  • 给一个list of cordinates, 判断有没有路径能经过所有点。
  • 经过所有点的路径有几条。


只有第一问写了code，follow up 都只是在聊天

https://www.1point3acres.com/bbs ... read&tid=490290

第二问应该是 count(start, p1) * count(p1, p2) * ... * count(p_{k - 1}, p_k)这种.

第三问是reflection principle

 follow up 1: 如果要求必须经过图中某一个点，如何求解
follow up 2: 如果给出一个必须经过的点的list，如何求解
follow up 3: follow up 2 如何判断循环可提前终止（没有办法全部走完所有给出的点）

https://www.1point3acres.com/bbs/forum.php?mod=viewthread&tid=490290
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