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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
#include <iostream>

using namespace std;

int orn(int* Rec, int RecS);
int checkRec(int* Rec, int RecS, bool Trend);

int main()
{
    int RecS;
    cin >> RecS;

    int* Rec = new int[RecS];
    for (int i = 0; i < RecS; i++)
        cin >> Rec[i];

    cout << orn(Rec, RecS) << "\n";

    delete[] Rec;

    return 0;
}

int orn(int* Rec, int RecS)
{
    int Try1, Try2;
    int* RecCopy = new int[RecS];

    // copying arrays
    for (int i = 0; i < RecS; i++)
        RecCopy[i] = Rec[i];

    Try1 = checkRec(Rec, RecS, true);
    Try2 = checkRec(RecCopy, RecS, false);

    delete[] RecCopy;

    if (Try1 <= Try2)
        return Try1;
    else
        return Try2;
}

int checkRec(int* Rec, int RecS, bool Trend)
{
    int Ret;
    Ret = 0;

    for (int i = 1; i < RecS; i++)
    {
        if (Rec[i - 1] <= Rec[i] && Trend)
        {
            Ret++;
            Rec[i] = -1000'000'000;
            Trend = false;
        }
        else
        if (Rec[i - 1] >= Rec[i] && !Trend)
        {
            Ret++;
            Rec[i] = 1000'000'000;
            Trend = true;
        }
        else
            Trend = !Trend;
    }

    return Ret;
}