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++ (GCC 9.2.1) (judge verdict: Accepted)

#include <iostream>
using namespace std;

int main(){
    int n;
    int d1[100],d2[100];
    int cun = 0;
    int ans = 0;

    cin >> n;
    for(int i = 0;i < n; i++){
        cin >> d1[i] >> d2[i];
    }
    for(int i = 0;i < n ;i++){
        if(d1[i] == d2[i]){
           cun++;
           if (cun >= 3){
               ans = cun;
               break;
           }
        }else{
           if(ans < cun) ans = cun;
           cun = 0;
        }
    }
    if (ans >= 3){
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }

return 0;
}