이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
const int M = 1e5 + 1, N = 500 + 1, inf = 1e9;
int cnt[M],ans,pre[N][M*2],temp[M*2];
int main()
{
int n,x;
cin>>n;
for (int i=0;i<n;i++)
cin>>x,cnt[x]++;
for (int i=1;i<M;i++)
ans+=(cnt[i]/2)*i,cnt[i]%=2;
int su=0;
vector<int> a;
for (int i=1;i<M;i++)
if (cnt[i])
su+=i,a.push_back(i);
n=a.size();
for (int i=0;i<M*2;i++)
temp[i]=pre[0][i]=-inf;
temp[M]=pre[0][M]=0;
for (int i=0;i<n;i++)
{
for (int j=0;j<M*2;j++)
{
if (j+a[i]<M*2)
temp[j+a[i]]=max(temp[j+a[i]],pre[i][j]+a[i]);
if (j-a[i]>=0)
temp[j-a[i]]=max(temp[j-a[i]],pre[i][j]+a[i]);
}
for (int j=0;j<M*2;j++)
pre[i+1][j]=temp[j];
}
int div=pre[n][M];
cout<<ans+div/2+su-div<<endl;
return 0;
}
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