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 Java (OpenJDK 11.0.6) (judge verdict: Wrong Answer)

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        long[] a = new long[n];
        for(int i=0; i<n; i++) {
            a[i] = sc.nextLong();
        }

        int ans = 0;
        for(int i=0; i<n; i++) {
            while(i+1 < n && a[i] == a[i+1]) i++;
            if(i+1 < n && a[i] <= a[i+1]) {
                while(i+1 < n && a[i] < a[i+1]) i++;
            } else if(i+1 < n && a[i] >= a[i+1]) {
                while(i+1 < n && a[i] > a[i+1]) i++;
            }
            ans++;
        }
        System.out.println(ans);
    }
}