ABC259-C XX to XXX

問題へのリンク

C#のソース

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

class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("abbaac");
            WillReturn.Add("abbbbaaac");
            //Yes
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("xyzz");
            WillReturn.Add("xyyzz");
            //No
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();
        string S = InputList[0];
        string T = InputList[1];

        var RunLenArr1 = RunLen.DeriveRunLenInfoArr(S);
        var RunLenArr2 = RunLen.DeriveRunLenInfoArr(T);

        if (RunLenArr1.Length != RunLenArr2.Length) {
            Console.WriteLine("No");
            return;
        }

        for (long I = 0; I <= RunLenArr1.GetUpperBound(0); I++) {
            // 文字が違えばNG
            if (RunLenArr1[I].AppearChar != RunLenArr2[I].AppearChar) {
                Console.WriteLine("No");
                return;
            }

            // Sの方が1文字の場合
            if (RunLenArr1[I].RunLen == 1) {
                if (RunLenArr2[I].RunLen > 1) {
                    Console.WriteLine("No");
                    return;
                }
            }

            // Sの方が2文字以上の場合
            if (RunLenArr1[I].RunLen > RunLenArr2[I].RunLen) {
                Console.WriteLine("No");
                return;
            }
        }
        Console.WriteLine("Yes");
    }
}

#region RunLen
// ランレングス圧縮(文字列)
internal class RunLen
{
    // ランレングス圧縮情報
    internal struct RunLenInfo
    {
        internal char AppearChar;
        internal int RunLen;
    }

    // ランレングス圧縮結果を返す
    internal static RunLenInfo[] DeriveRunLenInfoArr(string pBaseStr)
    {
        var RunLenInfoList = new List<RunLenInfo>();

        int StrUB = pBaseStr.Length - 1;
        char PrevChar = pBaseStr[0];
        int StrLen = 0;
        for (int I = 0; I <= StrUB; I++) {
            if (pBaseStr[I] != PrevChar) {
                RunLenInfo WillAdd;
                WillAdd.AppearChar = PrevChar;
                WillAdd.RunLen = StrLen;
                RunLenInfoList.Add(WillAdd);
                StrLen = 0;
                PrevChar = pBaseStr[I];
            }
            StrLen++;

            if (I == StrUB) {
                RunLenInfo WillAdd;
                WillAdd.AppearChar = pBaseStr[I];
                WillAdd.RunLen = StrLen;
                RunLenInfoList.Add(WillAdd);
            }
        }
        return RunLenInfoList.ToArray();
    }
}
#endregion

解説

ランレングス圧縮して、
文字が違えばNG
文字が同じでも一致させられなければNG

という判定を行ってます。