henix

/**
 * Arbitrary-length tuples
 * =======================
 * 
 * Working with tuples of unknown length in TypeScript is a pain. Most library authors fall back on enumerating all possible
 * tuple lengths up to a threshold (see an example here https://github.com/pelotom/runtypes/blob/fe19290d375c8818d2c52243ddc2911c8369db37/src/types/tuple.ts )
 * 
 * In this gist, I'm attempting to leverage recursion to provide support for arbitrary length tuples. This has the potential
 * to make some kinds of declarative APIs nicer and enhance type inference in some cases.
 * This example shows how to take a variable-length tuple as an input, transform each of its types and use the resulting

henix

有一存有整数的数组 A[n] (n <= 2^31 - 1, 但需要的话可以再扩大), 其中 0 <= i, A[i] <= n-1 且 i!=j 时 A[i]!=A[j] (即一个排列). 用你认为*最高效*的方法求 B=A^(-1) (即对范围内满足 A[B[i]]=i 的 B)

henix

/*************
* colors.js *
 *************
 *
 * You're almost at the exit. You just need to get past this
 * color lock.
 *
 * Changing your environment is no longer enough. You must
 * learn to change yourself. I've sent you a little something
 * that should help with that.