1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
#include <iostream>
#include <vector>
using namespace std;

int main()
{
    int n, a, prevNum, status, result = 0;
    cin >> n;
    vector<int> arr;

    for (int i = 0; i < n; i++) {
        cin >> a;
        arr.push_back(a);
    }

    //-1 malejąca
    // 0 poprzednie złe
    // 1 rosnąca

    if (arr[0] > arr[1]) status = -1;
    else if (arr[0] < arr[1]) status = 1;
    else {
        status = 0;
        result++;
    }

    for (int i = 2; i < n; i++) {
        prevNum = arr[i - 1];
        if (status == 0) {
            if (prevNum > arr[i]) status = -1;
            else if (prevNum < arr[i]) status = 1;
            else {
                status = 0;
                result++;
            }
        }
        else if (status == -1) {
            if (prevNum < arr[i]) status = 1;
            else {
                status = 0;
                result++;
            }
        }
        else {
            if (prevNum > arr[i]) status = -1;
            else {
                status = 0;
                result++;
            }
        }
    }
    
    cout << result << endl;
}