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[paiza]レベルアップ問題集解答案(C#)【配列の検索】何個ある? Boss

Last updated at Posted at 2024-09-26

問題

C#解答案

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
        // 1行目: 整数N, Mを取得
        int[] num = Array.ConvertAll(Console.ReadLine().Split(' '), int.Parse);

        // 2行目: M個の整数を取得し、配列に格納
        int[] list = Array.ConvertAll(Console.ReadLine().Split(' '), int.Parse);

        // リストからNの数を数える
        IEnumerable<int> li = list.Where(o => o == num[0]);
        //var li = list.Where(o => o == num[0]);

        // Nがいくつあったかを出力
        Console.WriteLine(li.Count());
    }
}
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