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 69 / 78 1500
Good subarray 62 / 70 1600
Brewing potion 6 33 / 38 1700
Mino 10 / 15 1800
Traffic system 38 / 44 2000
Odd 8 / 33 2100