How to Solve Number of Ways to Wear Different Hats to Each Other Problem
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Number of Ways to Wear Different Hats to Each Other
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 ca...
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Problem Statement
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, return it modulo 109 + 7.
Number of Ways to Wear Different Hats to Each Other
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Examples
hats = [[3,4],[4,5],[5]]1There is only one way to choose hats given the conditions. First person choose hat 3, Second person choose hat 4 and last one hat 5.
hats = [[3,5,1],[3,5]]4There are 4 ways to choose hats: (3,5), (5,3), (1,3) and (1,5)
hats = [[1,2,3,4],[1,2,3,4],[1,2,3,4],[1,2,3,4]]24Each person can choose hats labeled from 1 to 4. Number of Permutations of (1,2,3,4) = 24.
Constraints
n == hats.length1 <= n <= 101 <= hats[i].length <= 401 <= hats[i][j] <= 40hats[i] contains a list of unique integers.How Interview Coder Helps with Leetcode Problems
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