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
// Mateusz Bogusławski
#include <iostream>

using namespace std;

#define L_MIN -1000000
#define L_MAX 1000000

int main() {
    int n, cs = 0, cg = 0;

    cin >> n;

    int ps, pg, ls, lg;

    cin >> ls;
    lg = ls;
    for (int i = 1; i < n; i++) {
        ps = ls;
        pg = lg;
        cin >> ls;
        lg = ls;

        if (i%2 == 1) {
            if (ls >= ps) {
                cs++;
                ls = L_MIN;
            }

            if (lg <= pg) {
                cg++;
                lg = L_MAX;
            }
        } else {
            if (ls <= ps) {
                cs++;
                ls = L_MAX;
            }

            if (lg >= pg) {
                cg++;
                lg = L_MIN;
            }
        }
    }

    cout << min(cs , cg) << endl;
}