Module Hash a set

Hash a set

**Frequency: 4/10** Different from string hashing, this method is used to hash sets and multisets (e.g. $\\{1, 2, 2\\}$ is equivalent to $\\{2, 1, 2\\}$).

Resources

- [Codeforces Blogs: XOR Hashing [TUTORIAL]](https://codeforces.com/blog/entry/85900)

Problems

Prefix equality 71 / 80 1500
Good subarray 64 / 72 1600
Brewing potion 6 37 / 41 1700
Mino 12 / 17 1800
Traffic system 41 / 46 2000
Odd 9 / 39 2100