Problem:
Score : 300 points

Problem Statement

You are given an array A of length N.
Your task is to divide it into several contiguous subarrays.
Here, all subarrays obtained must be sorted in either non-decreasing or non-increasing order.
At least how many subarrays do you need to divide A into?

Constraints

1 \leq N \leq 10^5

1 \leq A_i \leq 10^9

Each A_i is an integer.

Input

Input is given from Standard Input in the following format:

N
A_1 A_2 ... A_N

Output

Print the minimum possible number of subarrays after division of A.

Sample Input 1

6
1 2 3 2 2 1

Sample Output 1

2

One optimal solution is to divide the array into [1,2,3] and [2,2,1].

Sample Input 2

9
1 2 1 2 1 2 1 2 1

Sample Output 2

5

Sample Input 3

7
1 2 3 2 1 999999999 1000000000

Sample Output 3

3

Solution in JavaScript (node.js v5.12) (judge verdict: Runtime Error)

process.stdin.resume(); 
process.stdin.setEncoding('utf8'); 

process.stdin.on('data', function(chunk) {
	console.log(chunk);

    var input = chunk.split("\n");

    var n = parseInt(input[0],10);
    var a = input[1].split(" ");

    for(var i = 0;i < n;i++){
        a[i] = parseInt(a[i],10);
    }


    var ans = 0;

    var b = 0;
    for(var i = 1;i < n;i++){
        if(b == 0){
            b = a[i] - a[i - 1];
        }else if(b > 0){
            if(a[i] - a[i - 1] < 0){
                ans++;b = 0;
            }
        }else
        {
            if(a[i] - a[i - 1] > 0){
                ans++;b = 0;
             }
        }
    }

    ans++;
    console.log(ans);
});