Day 16 part 2: computing the answer can be 2^n * n

[mbuzdalov]

https://github.com/elizarov/AdventOfCode2022/blob/a742a56b01f3067fd43e1dc57f0db0ca9db90be4/src/Day16Part2Fast.kt#L47

If you "expand" bm such that it represents the best solution on a subset of the argument, you don't need the third subset :)