题解 | 打印极值点下标

#include<iostream>
using namespace std;
int main(){
    int k;
    while(cin>>k){
        int arr[k];
        for(int i=0;i<k;i++){
            cin>>arr[i];
        }
        int i=0;
        if(arr[i]!=arr[i+1])
            cout<<"0"<<" ";
        for(i=1;i<k-1;i++){
            if(arr[i]>arr[i-1]&&arr[i]>arr[i+1]||arr[i]<arr[i-1]&&arr[i]<arr[i+1])
                cout<<i<<" ";
        }
        i=k-1;
        if(arr[i]!=arr[i-1])
            cout<<i<<" ";
        cout<<endl;
    }
}