#89299 (C#(csc)) No.167 N^M mod 10

• 問題: No.167 N^M mod 10
• ユーザー: 14番
• 提出日時: 2016-04-30 03:44:38
• 言語: C#(csc) (csc 3.9.0)
• 結果: AC
• 実行時間: 28 ms / 1,000 ms
• コード長: 3,275 bytes
• コンパイル時間: 914 ms
• コンパイル使用メモリ: 115,864 KB
• 実行使用メモリ: 25,960 KB
• 最終ジャッジ日時: 2024-09-22 01:30:59
• 合計ジャッジ時間: 2,661 ms
• ジャッジサーバーID （参考情報）: judge2 / judge5

ファイルパターン	結果
sample	AC * 2
other	AC * 27

コンパイルメッセージ

Microsoft (R) Visual C# Compiler version 3.9.0-6.21124.20 (db94f4cc)
Copyright (C) Microsoft Corporation. All rights reserved.

ソースコード

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using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
 
class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        string numStr = Reader.ReadLine();
        string powStr = Reader.ReadLine();
        
        int num = int.Parse(numStr.Substring(numStr.Length - 1));
        
        Dictionary<int, int[]> dic = new Dictionary<int, int[]>();
        dic.Add(0, new int[]{0});
        dic.Add(1, new int[]{1});
        dic.Add(2, new int[]{2, 4, 8, 6});
        dic.Add(3, new int[]{3, 9, 7, 1});
        dic.Add(4, new int[]{4, 6});
        dic.Add(5, new int[]{5});
        dic.Add(6, new int[]{6});
        dic.Add(7, new int[]{7,9,3,1});
        dic.Add(8, new int[]{8,4,2,6});
        dic.Add(9, new int[]{9, 1});
        
        int pow = int.Parse(powStr.Substring(Math.Max(0, powStr.Length - 2)));
        int idx = pow % dic[num].Length - 1;
        if(idx < 0) {
            idx = dic[num].Length - 1;
        }
        
        int ans = 1;
        if(powStr != "0") {
            ans = dic[num][idx];
        }
        Console.WriteLine(ans);
    }
    
    
    private Dictionary<string, int> dic = new Dictionary<string, int>();
    private int getAns(int num, string powStr) {
        string[] div2 = this.Div2(powStr);
        
        int ans = 1;
        if(div2[0].Length >= 2) {
            ans = this.getAns(num, div2[0]);
        } else {
            int pow = int.Parse(div2[0]);
            ans = (int)(Math.Pow(num, pow) % 10);
        }
        ans = ans * ans;
        if(div2[1] == "1") {
            ans = ans * num;
        }
        ans = ans % 10;
        return ans;
    }
    
    private string[] Div2(string strNum) {
        StringBuilder ans = new StringBuilder();
        int nextKeta = 0;
        for(int i=0; i<strNum.Length; i+=9) {
            int len = Math.Min(9, strNum.Length - i);
            long tmp = long.Parse(nextKeta + strNum.Substring(i, len));
            ans.Append(tmp / 2);
            nextKeta = (int)tmp % 2;
        }
        return new String[] {ans.ToString(), nextKeta.ToString()};
    }
    
    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"
99999
987
 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        public static int[] GetInt(char delimiter = ' ', bool trim = false)
        {
            string inptStr = ReadLine();
            if (trim)
            {
                inptStr = inptStr.Trim();
            }
            string[] inpt = inptStr.Split(delimiter);
            int[] ret = new int[inpt.Length];
            for (int i = 0; i < inpt.Length; i++)
            {
                ret[i] = int.Parse(inpt[i]);
            }
            return ret;
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}
 
 
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