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 <stdio.h>

int	main(void)
{
	int	n, d1, d2;
	int	flg = 0;
	int	max = 0;

	scanf("%d", &n);
	for (int i = 0; i < n; i++)
	{
		scanf("%d %d", &d1, &d2);
		if (d1 == d2)
			flg++;
		else
		{
			if (max < flg)
				max = flg;
			flg = 0;
		}
	}
	if (max < flg)
		max = flg;
	if (3 <= max)
		printf("Yes\n");
	else
		printf("No\n");
	return 0;
}