How to Solve Couples Holding Hands Problem
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Couples Holding Hands
There are n couples sitting in 2n seats arranged in a row and want to hold hands. The people and seats are represented by an integer array row where row[i] is the ID of the person sitting in the ith s...
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Understanding the Couples Holding Hands Problem
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Problem Statement
There are n couples sitting in 2n seats arranged in a row and want to hold hands. The people and seats are represented by an integer array row where row[i] is the ID of the person sitting in the ith seat. The couples are numbered in order, the first couple being (0, 1), the second couple being (2, 3), and so on with the last couple being (2n - 2, 2n - 1). Return the minimum number of swaps so that every couple is sitting side by side. A swap consists of choosing any two people, then they stand up and switch seats.
Couples Holding Hands
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Examples
row = [0,2,1,3]1We only need to swap the second (row[1]) and third (row[2]) person.
row = [3,2,0,1]0All couples are already seated side by side.
Constraints
2n == row.length2 <= n <= 30n is even.0 <= row[i] < 2nAll the elements of row are unique.How Interview Coder Helps with Leetcode Problems
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