Luogu P4394 [BOI2008]Elect 选举

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;

int n,a[100005],dp[100005],sum,half,ans;

int main(){
	scanf("%d",&n);
	for(int i=1;i<=n;i++){
		scanf("%d",&a[i]);
		sum+=a[i];
	}
	half=sum>>1;
	sort(a+1,a+n+1);
	for(int i=n;i>=1;i--){
		for(int j=sum;j>=0;j--){
			if(j>=a[i])dp[j]=max(dp[j],dp[j-a[i]]+a[i]);
			if(dp[j]>half&&dp[j]-a[i]<=half){
				ans=max(ans,dp[j]);
			}
		}
	}
	printf("%d\n",ans);
}