The 37th ACM/ICPC Asia Regional ChangChun Site Contest - C The Little Girl who Picks Mushrooms

    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:

#include<iostream>
#include<stdio.h>
#include<string.h>
#include<math.h>
#include<algorithm>
#include<stack>
#include<queue>
#include<set>
#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 (i=1;i<=4;i++)
                         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;
}