题解 100% AC

#include<bits/stdc++.h>
using namespace std;
const int N=1e5+5;
int n,a[N],max1=0,max2=0;
int main(){
    cin>>n;
    for(int i=1;i<=n;i++)cin>>a[i];
    for(int i=1;i<=n;i++){
    	if(a[i]%2==0) max1=max(max1,a[i]);
        else if(a[i]%2!=0) max2=max(max2,a[i]);
    }
    if(max1==0||max2==0) cout<<-1;
    else cout<<max1+max2;
	return 0;
}