题解 | 打印极值点下标

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

int min_num(int a,int b)
{
    if(a<b)return a;
    else return b;
}
int max_num(int a,int b)
{
    if(a>b)return a;
    else return b;
}

int main()
{
    int n;
    while(cin>>n)
    {
        int num[n];
        for(int i = 0;i<n;i++)
        {
            cin>>num[i];
        }
        if(num[0]!=num[1])
        {
            cout<<0<<" ";
        }

        for(int i = 1;i<n-1;i++)
        {
            if(num[i]<min_num(num[i-1],num[i+1])||num[i]>max_num(num[i-1],num[i+1]))
            {
                cout<<i<<" ";
            }
        }

        if(num[n-2]!=num[n-1])
        {
            cout<<n-1<<" ";
        }
        cout<<endl;
    }
    return 0;
}