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 64 / 72 1500
Good subarray 54 / 61 1600
Brewing potion 6 29 / 33 1700
Mino 8 / 11 1800
Traffic system 32 / 35 2000
Odd 7 / 26 2100