#140913 (C#(csc)) No.470 Inverse S+T Problem

• 問題: No.470 Inverse S+T Problem
• ユーザー: 14番
• 提出日時: 2016-12-23 07:08:38
• 言語: C#(csc) (csc 3.9.0)
• 結果: AC
• 実行時間: 308 ms / 2,000 ms
• コード長: 3,581 bytes
• コンパイル時間: 977 ms
• コンパイル使用メモリ: 108,800 KB
• 実行使用メモリ: 22,656 KB
• 最終ジャッジ日時: 2024-12-22 13:38:04
• 合計ジャッジ時間: 3,628 ms
• ジャッジサーバーID （参考情報）: judge5 / judge3

ファイルパターン	結果
sample	AC * 4
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.Linq;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Text;
public class Program
{
    public void Proc() {
        Reader.IsDebug = false;
        int inputCount = int.Parse(Reader.ReadLine());
        this.WordList = new string[inputCount];
        for(int i=0; i<inputCount; i++) {
            this.WordList[i] = Reader.ReadLine();
        }
        if(inputCount > ('z'-'a') + ('Z' - 'A') + 2) {
            Console.WriteLine("Impossible");
            return;
        }
        Dictionary<char, bool> keyDic = new Dictionary<char, bool>();
        this.WordList.ToList().ForEach(a=>{
            keyDic[a[0]] = true;
            keyDic[a[2]] = true;
        });
        if(keyDic.Keys.Count() < inputCount) {
            Console.WriteLine("Impossible");
            return;
        }
        List<string> ans = this.GetAns(0, new Dictionary<string, int>());
        if(ans == null) {
            Console.WriteLine("Impossible");
        } else {
            ans.ForEach(a=>Console.WriteLine(a));
        }
    }
    private List<string> GetAns(int idx, Dictionary<string, int> dic) {
        string str1 = WordList[idx].Substring(0,1);
        string str2 = WordList[idx].Substring(1,2);
        if((!dic.ContainsKey(str1)) && (!dic.ContainsKey(str2))) {
            if(idx < this.WordList.Length - 1) {
                dic.Add(str1, idx);
                dic.Add(str2, idx);
                List<string> tmp = GetAns(idx+1, dic);
                dic.Remove(str1);
                dic.Remove(str2);
                if(tmp != null) {
                    tmp.Insert(0, str1 + " " + str2);
                    return tmp;
                }
            } else {
                return new string[] {str1 + " " + str2}.ToList();
            }
        }
        if(this.WordList[idx].Count(a=>a==this.WordList[idx][0]) == 3) {
            return null;
        }
        if(str1.Equals(this.WordList[idx].Substring(2))) {
            if(dic.ContainsKey(str1)) {
                return null;
            }
        }
        if(str2.Equals(this.WordList[idx].Substring(0,2))) {
            if(dic.ContainsKey(str2)) {
                return null;
            }
        }
        str1 = this.WordList[idx].Substring(0, 2);
        str2 = this.WordList[idx].Substring(2, 1);   
        if((!dic.ContainsKey(str1)) && (!dic.ContainsKey(str2))) {
            if(idx < this.WordList.Length - 1) {
                dic.Add(str1, idx);
                dic.Add(str2, idx);
                List<string> tmp = GetAns(idx+1, dic);
                dic.Remove(str1);
                dic.Remove(str2);
                if(tmp != null) {
                    tmp.Insert(0, str1 + " " + str2);
                    return tmp;
                }
            } else {
                return new string[] {str1 + " " + str2}.ToList();
            }
        }
        return null;
    }
    private string[] WordList;
    public class Reader {
        public static bool IsDebug = true;
        private static System.IO.StringReader SReader;
        private static string InitText = @"
";
        public static string ReadLine() {
            if(IsDebug) {
                if(SReader == null) {
                    SReader = new System.IO.StringReader(InitText.Trim());
                }
                return SReader.ReadLine();
            } else {
                return Console.ReadLine();
            }
        }
    }
    public static void Main(string[] args)
    {
        Program prg = new Program();
        prg.Proc();
    }
}
 
 
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