就这还困难？？？

#include <iostream>
#include <algorithm>
using namespace std;

int main() {
    int n;
    cin>>n;
    int arr[1000];
    for (int i = 0; i < n; ++i) {
        cin >> arr[i];
    }
    sort(arr, arr + n);
    std::cout<<arr[n-1]<<std::endl;
    if (n == 1) {
        std::cout << "-1" << std::endl;
    } else {
        for (int i = 0; i < n - 1; ++i) {
            std::cout << arr[i]<<" ";
        }
    }

}