题解

#include <iostream>
#include <vector>
#include <climits>

using namespace std;

int main() {
    int n;
    cin >> n;
    
    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    
    int max_even = INT_MIN;
    int max_odd = INT_MIN;
    
    for (int num : a) {
        if (num % 2 == 0) { 
            if (num > max_even) {
                max_even = num;
            }
        } else { 
            if (num > max_odd) {
                max_odd = num;
            }
        }
    }
    
    if (max_even != INT_MIN && max_odd != INT_MIN) {
        cout << max_even + max_odd << endl;
    } else {
        cout << -1 << endl;
    }
    
    return 0;
}