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 Go (1.14.1) (judge verdict: Accepted)

package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
	"strconv"
)

func main() {
	sc := newScanner()
	var n = sc.readInt()
	var l = make([][]int, n)
	for i := 0; i < n; i++ {
		var a = make([]int, 2)
		for j := 0; j < 2; j++ {
			a[j] = sc.readInt()
		}
		l[i] = a
	}
	for i := 0; i < len(l)-2; i++ {
		if l[i][0] == l[i][1] && l[i+1][0] == l[i+1][1] && l[i+2][0] == l[i+2][1] {
			fmt.Println("Yes")
			return
		}
	}
	fmt.Println("No")

}

//////////////////
//////////////////
//////////////////

func abs(x int) int {
	if x >= 0 {
		return x
	}
	return -x
}

func min(values ...int) int {
	if len(values) == 0 {
		panic("no values")
	}

	min := values[0]
	for _, v := range values {
		if v < min {
			min = v
		}
	}
	return min
}

func max(values ...int) int {
	if len(values) == 0 {
		panic("no values")
	}

	max := values[0]
	for _, v := range values {
		if v > max {
			max = v
		}
	}
	return max
}

func pow(base, exponent int) int {
	if exponent < 0 {
		panic(fmt.Sprintf("exponent (%d) should not be a minus", exponent))
	}

	answer := 1
	for i := 0; i < exponent; i++ {
		answer *= base
	}
	return answer
}

func ceil(divident, dividor int) int {
	if dividor == 0 {
		panic("dividor should not be 0")
	}

	quo := divident / dividor
	rem := divident % dividor

	if rem != 0 {
		if (divident > 0 && dividor > 0) ||
			(divident < 0 && dividor < 0) {
			return quo + 1
		}
	}
	return quo
}

// -   sortutil

func reverseInts(a []int) {
	sort.Sort(sort.Reverse(sort.IntSlice(a)))
}

func reverseStrings(a []string) {
	sort.Sort(sort.Reverse(sort.StringSlice(a)))
}

// -   io

type scanner struct {
	bufScanner *bufio.Scanner
}

func newScanner() *scanner {
	bufSc := bufio.NewScanner(os.Stdin)
	bufSc.Split(bufio.ScanWords)
	bufSc.Buffer(nil, 100000000)
	return &scanner{bufSc}
}

func (sc *scanner) readString() string {
	bufSc := sc.bufScanner
	bufSc.Scan()
	return bufSc.Text()
}

func (sc *scanner) readInt() int {
	bufSc := sc.bufScanner
	bufSc.Scan()
	text := bufSc.Text()

	num, err := strconv.Atoi(text)
	if err != nil {
		panic(err)
	}
	return num
}

func (sc *scanner) readInt64() int64 {
	bufSc := sc.bufScanner
	bufSc.Scan()
	text := bufSc.Text()

	num, err := strconv.ParseInt(text, 10, 64)
	if err != nil {
		panic(err)
	}
	return num
}