← All problemsSign in

Permutation Problem

Consider the following algorithm, which generates a (not necessarily uniformly) random permutation of numbers 1 through N: P := [1, 2, ..., N] for i in 1..N do j := rand(1, N) swap(P[i], P[j]) Here, rand(1, N) returns a uniformly random integer between 1 and N inclusive. Let's denote the probability that the permutation generated by this algorithm is P by p(P). Given a value N and

HINT LADDERno hints yet
L1 Observation
L2 Technique
L3 Approach
L4 Pseudo-code
🔒
L5 Full solution
L5 unlocks only if you insist twice
solution.cppC++17

CodeSearch Tutor

Hints, not spoilers — it won’t hand over the full solution unless you insist.

voice by Sarvam AI

Sign in to chat with the tutor and save your progress.

Sign in to start