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 Python (3.4.3) (judge verdict: Accepted)

n = int(input())
a = list(map(int, input().split()))
ans = 1
temp = a[0]
st = 0
if n == 1:
    print(ans)
else:
    for i in a[1:]:
        if st == 1:
            if i < temp:
                st = 0
                ans += 1
        elif st == -1:
            if i > temp:
                st = 0
                ans += 1
        else:
            if temp > i:
                st = -1
            elif temp < i:
                st = 1
        temp = i
    print(ans)