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 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<stdio.h>
int a[200000];
int main(void){
    int i;
    int n;
    int dev;
    int now;
    int pn;
    int pre;
    dev=0;
    pn=0;
    scanf("%d",&n);
    for(i=0;i<n;i++){
        scanf("%d",&now);
        if(i==0){
            dev++;
        }else{
            if(pn==0){
                if(now-pre>0){
                    pn=1;
                }else if(now-pre<0){
                    pn=-1;
                }else{
                    pn=0;
                }
            }else if(pn==1){
                if(now-pre>0){
                    pn=1;
                }else if(now-pre<0){
                    dev++;
                    pn=0;
                }else{
                    pn=1;
                }
            }else{
                if(now-pre>0){
                    dev++;
                    pn=0;
                }else if(now-pre<0){
                    pn=-1;
                }else{
                    pn=0;
                }
            }
        }
        pre=now;
    }
    printf("%d\n",dev);
    return 0;
}