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: Wrong Answer)

N = int(input())
A = list(map(int, input().split()))
if N == 1:
  print(1)
else:
  result = 1
  d = 0
  for i in range(1, N):
    if A[i - 1] == A[i]:
      continue
    else:
      if d == 0:
        if A[i - 1] > A[i]:
          d = -1
        else:
          d = 1
      elif d == 1 and A[i - 1] > A[i]:
        d = -1
        result += 1
      elif d == -1 and A[i - 1] < A[i]:
        d = 1
        result += 1
  print(result)