题解

#include<iostream>
#include<cmath>
using namespace std;
int main(){
    int n,max1=-1e9,max2=-1e9;
    cin>>n;
    int a[n+10];
    for(int i=0;i<n;i++){
        cin>>a[i];
        if(a[i]%2==0){
            max1=max(max1,a[i]);
        }else{
            max2=max(max2,a[i]);
        }
    }
    if(max1!=-1e9&&max2!=-1e9){
        cout<<max1+max2;
    }else{
        cout<<-1;
    }
    return 0;
}