Problem:
Score : 200 points

Problem Statement

Tak performed the following action N times: rolling two dice.
The result of the i-th roll is D_{i,1} and D_{i,2}.

Check if doublets occurred at least three times in a row.
Specifically, check if there exists at lease one i such that D_{i,1}=D_{i,2}, D_{i+1,1}=D_{i+1,2} and D_{i+2,1}=D_{i+2,2} hold.

Constraints

3 \leq N \leq 100

1\leq D_{i,j} \leq 6

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
D_{1,1} D_{1,2}
\vdots
D_{N,1} D_{N,2}

Output

Print Yes if doublets occurred at least three times in a row. Print No otherwise.

Sample Input 1

5
1 2
6 6
4 4
3 3
3 2

Sample Output 1

Yes

From the second roll to the fourth roll, three doublets occurred in a row.

Sample Input 2

5
1 1
2 2
3 4
5 5
6 6

Sample Output 2

No

Sample Input 3

6
1 1
2 2
3 3
4 4
5 5
6 6

Sample Output 3

Yes

Solution in C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Collections;

namespace gotojail
{
    class Program
    {
        static void Main(string[] args)
        {
            //結果格納ハッシュテーブル
            Hashtable hsResult = new Hashtable();

            //1行目をとる
            var times = int.Parse(Console.ReadLine());
            for (var i = 0; i < times; i++)
            {
                // for文ぐるぐるで標準入力ピコピコして配列に入れ込んでいる
                string input = Console.ReadLine();

                //各行の結果の配列をハッシュテーブルに格納する
                hsResult.Add(i, input);
            }

            //3階連続でぞろ目か判定する
            if (BolChk3TimesZorome(hsResult, times))
            {
                Console.WriteLine("Yes");
            }
            else
            {
                Console.WriteLine("No");
            }

        }

        public static Boolean BolChk3TimesZorome(Hashtable phsInput, int pintTimes) {

            string strResultTF = "";

            //ハッシュテーブルを展開する
            for (var i = 0; i < pintTimes; i++)
            {
                string strResInhs = phsInput[i].ToString();
                string[] strRes = strResInhs.Split(" ");

                if (strRes[0].ToString() == strRes[1].ToString())
                {
                    strResultTF += "t";
                }
                else
                {
                    strResultTF += "f";
                }

            }
            //「ttt」の文字列を検索する
            return strResultTF.Contains("ttt");

        }
    }
}