c语言代码解决问题

解题思路:

注意事项:

参考代码:

#include<stdio.h>

int main()

{

    int n,a[20], b[20],i,j,k,sum=0;

    while (scanf("%d", &n) != EOF)

    {

        sum = 0;

        for (i = 0; i < n; i++)

            scanf("%d", &a[i]);

        for (i = 1; i < n - 1; i++)

        {

            if ((a[i]<a[i + 1] && a[i]>a[i - 1]) || (a[i] > a[i + 1] && a[i] < a[i - 1]))

                sum++;

        }

        printf("%d\n", sum);

    }

    return 0;

}