Submission #1220980

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

int a[100005];

int main()
{
    cin.sync_with_stdio(false);
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) cin >> a[i];

    if (n <= 2)
    {
        cout << "1\n";
        return 0;
    }

    int ans = 1;
    int sign = a[1] - a[0];

    for (int i = 2; i < n; i++)
    {
        int ns = a[i] - a[i - 1];

        if (sign == 0) sign = ns;
        if (sign * 1ll * ns < 0)
        {
            ++ans;
            sign = 0;
        }
    }

    cout << ans << endl;
}

Submission Info

Judge Result