can you find it

can you find it?

最近感觉二分压力超级大，所以和妹子一起做了二分的题目，好水的题目啊，可是没办法谁叫我们太弱了呢，继续加油，我要变大牛，不要做菜鸟。

Description

Give you three sequences of numbers A, B, C, then we give you a number X. Now you need to calculate if you can find the three numbers Ai, Bj, Ck, which satisfy the formula Ai+Bj+Ck = X.

Input

There are many cases. Every data case is described as followed: In the first line there are three integers L, N, M, in the second line there are L integers represent the sequence A, in the third line there are N integers represent the sequences B, in the forth line there are M integers represent the sequence C. In the fifth line there is an integer S represents there are S integers X to be calculated. 1<=L, N, M<=500, 1<=S<=1000. all the integers are 32-integers.

Output

For each case, firstly you have to print the case number as the form "Case d:", then for the S queries, you calculate if the formula can be satisfied or not. If satisfied, you print "YES", otherwise print "NO".

Sample Input

3 3 3
1 2 3
1 2 3
1 2 3
3
1
4
10

 
一看数据那么大，就想到二分了，首先把二个变成一个再二分时间复杂度为nlog(n*n)这样就不会超时了。二分算法就不说了，地球人都知道。

 
代码：

#include<iostream>
#include<cmath>
#include<algorithm>
using namespace std;
int a[505],b[505],c[505];
int dp[250025];
int main()
{
  int i,j,k,m,n,s,t,cas=0,p,flag;
  while(scanf("%d%d%d",&k,&m,&n)!=EOF)
  {
    for(i=0;i<k;i++)
      scanf("%d",&a[i]);
    for(i=0;i<m;i++)
      scanf("%d",&b[i]);
    for(i=0;i<n;i++)
      scanf("%d",&c[i]);
    p=0;
    for(i=0;i<k;i++)
      for(j=0;j<m;j++)
        dp[p++]=a[i]+b[j];
     sort(dp,dp+p);
     printf("Case %d:\n",++cas);
     scanf("%d",&t);
    while(t--)
    {
     scanf("%d",&s);   flag=0;
     for(i=0;i<n;i++)
     {
       int l=0,r=p-1,mid;
       while(l<=r)
       {
         mid=(l+r)/2;
         if(dp[mid]+c[i]==s){ flag=1;break;}
         else if(dp[mid]+c[i]<s) l=mid+1;
         else if(dp[mid]+c[i]>s) r=mid-1;
       }
       if(flag) break;
    }
   
    if(flag) printf("YES\n");
    else printf("NO\n");
  }
}
  return 0;
}

1楼yangshuolll2小时前: 好厉害啊~~~求罩~~

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