嗯大家放心大胆的模拟~

C++ 代码

#include <cstdio>

const int N = 1010;
int arr[N];
int cnt;

int main() {
    int n;
    scanf("%d", &n);

    for (int i = 0; i < n; ++ i) scanf("%d", &arr[i]);

    for (int i = 1; i < n - 1; ++ i) {
        if (arr[i - 1] > arr[i] && arr[i] < arr[i + 1]) cnt ++;
        if (arr[i - 1] < arr[i] && arr[i] > arr[i + 1]) cnt ++;
    }

    printf("%d", cnt);
    return 0;
}