题解 | 灵异背包？

#include <iostream>
using namespace std;

int main() {
    int n;cin>>n;
    int a[n],s=0,minji=2e4;
    //求和，和为偶则为答案，为奇数减去最小的奇数
    for(int i=0;i<n;i++)
    {
        cin>>a[i];
        s+=a[i];
        if(a[i]%2==1) minji=min(minji,a[i]);
    }
    if(s%2==0) cout<<s;
    else cout<<s-minji;
    return 0;
}