题意略坑...给的modulo 20121014 是忽悠人的...用不上..因为答案最多最多1024...数据量小..分情况讨论..
Program:
[cpp]
#include
#include
#include
#include
#include
#include
#include
#include
#define ll long long
using namespace std;
int n,a[10],ans,sum;
int main()
{
int i,j,k,m;
while (scanf("%d",&n)!=EOF)
{
ans=sum=0;
for (i=1;i<=n;i++)
{
scanf("%d",&a[i]);
sum+=a[i];
}
if (n<4) ans=1024;
else
if (n==4)
{
for (j=i+1;j<=4;j++)
{
m=a[i]+a[j];
while (m>1024) m-=1024;
if (m>ans) ans=m;
}
for (i=1;i<=4;i++)
for (j=i+1;j<=4;j++)
for (k=j+1;k<=4;k++)
if ((a[i]+a[j]+a[k])%1024==0) ans=1024;
}else
{
for (i=1;i<=5;i++)
for (j=i+1;j<=5;j++)
for (k=j+1;k<=5;k++)
if ((a[i]+a[j]+a[k])%1024==0)
{
m=sum-a[i]-a[j]-a[k];
while (m>1024) m-=1024;
if (m>ans) ans=m;
}
}
printf("%d\n",ans);
}
return 0;
}