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 C (Clang 3.8.0) (judge verdict: Accepted)

#include <stdio.h>

int main(int argc, const char * argv[]) {
    // insert code here...
    int N;
    scanf("%d", &N);
    int state = 0;
    int arrCount = 1;
    int lastNum;
    scanf("%d", &lastNum);
    int newNum;
    for(int i = 1; i < N; i++) {
        scanf("%d", &newNum);
//        if (newNum == lastNum) continue;
        if (newNum > lastNum) {
            if (state >= 0) {
                state = 1;
            }
            else {
                state = 0;
                arrCount++;
            }
        }
        
        else if (newNum < lastNum) {
            if (state <= 0) {
                state = -1;
            }
            else {
                state = 0;
                arrCount++;
            }
        }
        
        lastNum = newNum;
    }
    
    
    printf("%d\n", arrCount);
    return 0;
}