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 104 / 115 1500
Good subarray 94 / 102 1600
Brewing potion 6 55 / 59 1700
Mino 22 / 26 1800
Traffic system 56 / 63 2000
Odd 18 / 51 2100