※[프로그래머스]Lv.1 체육복 C#(except)

https://school.programmers.co.kr/learn/courses/30/lessons/42862

프로그래머스

소스코드

using System;
using System.Linq;
public class Solution
{
    public int solution(int n, int[] lost, int[] reserve)
    {
        int answer = 0;

        int[] excpReserve = reserve.Except(lost).Select(x => x).ToArray();
        int[] excpLost = lost.Except(reserve).Select(x => x).ToArray();

        Array.Sort(excpReserve);
        Array.Sort(excpLost);

        for (int i = 0; i < excpReserve.Length; i++)
        {
            int num = excpLost.FirstOrDefault(w => w == excpReserve[i] - 1 || w == excpReserve[i] + 1);
            if (num > 0)
            {
                excpLost[Array.IndexOf(excpLost, num)] = 0;
                answer++;
                continue;
            }
        }

        return answer + (n - excpLost.Length);
    }
}