Number of Ways to Wear Different Hats to Each Other at Roblox

Problem Description

There are `n` people and `40` types of hats labeled from `1` to `40`. Given a 2D integer array `hats`, where `hats[i]` is a list of all hats preferred by the `ith` person. Return the number of ways that `n` people can wear **different** hats from each other. Since the answer may be too large, ret...

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