Submission #3377692

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Source Code Expand

using System;
using System.Linq;//リストの使用
using System.Collections.Generic;
class Program
{
	static void Main()
	{
		long n = long.Parse(Console.ReadLine());//int.Parseは文字列を整数に変換。
    long[][] nums = new long[2*n][];//座標と種類
    long memo = 0;
    long multiplyMemo = 1;
    long answer = 1;
    long mod = 1000000007;
    for(long i = 0; i < n; i++)
    {
      nums[i] = new long[2];
      nums[i][0] = long.Parse(Console.ReadLine());
      nums[i][1] = 0;
    }
    for(long i = n; i < 2*n; i++)
    {
      nums[i] = new long[2];
      nums[i][0] = long.Parse(Console.ReadLine());
      nums[i][1] = 1;
    }
    Array.Sort(nums, (a, b) => a[0].CompareTo(b[0]));
    for(long i = 0; i < 2*n; i++)
    {
      if(nums[i][1] == 0)
      {
        memo++;
        if(memo > 1) answer *= Math.Abs(memo);
        answer %= mod;
      }
      else
      {
        memo--;
        if(memo < -1) answer *= Math.Abs(memo);
        answer %= mod;
      }
      //Console.WriteLine(answer);
    }
    
		Console.WriteLine(answer);//WriteLineをWriteとすると、改行なしで出力。
	}
  
}

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