Can you find it? 分类： 二分查找 2015-06-10 19:55 5人阅读 评论(0) 收藏

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

Sample Output

Case 1:
NO
YES
NO
一开始TLE因为是三个for循环在一起，后来将两个for循环分开就没TLE了

#include<cstdio>
#include<iostream>
#include<algorithm>
#include<cstdlib>
int n,m,l,t,f,tmp,q;
using namespace std;
int a[1000],b[1000],c[1000],d[2555555];
int main()
{int cnt=0;
    while(~scanf("%d%d%d",&l,&n,&m))
    {f=0;
    for(int i=0;i<l;i++)
    scanf("%d",&a[i]);
    for(int i=0;i<n;i++)
    scanf("%d",&b[i]);
    for(int i=0;i<m;i++)
    scanf("%d",&c[i]);
    int y=0;
    for(int j=0;j<l;j++)
    for(int k=0;k<n;k++)
    d[y++]=a[j]+b[k];
    sort(d,d+y);
    scanf("%d",&t);
    printf("Case %d:\n",++cnt);
         while(t--)
        {scanf("%d",&tmp);
        for(int i=0;i<m;i++)
         {q=tmp-c[i];
        int low=0;
            int high=y-1;
            int mid=(y-1)/2;
            while(low<high)
                {
                    if(d[mid]==q)
                    {f=1;
                    break;}
                    if(d[mid]<q)
                    low=mid+1;
                    if(d[mid]>q)
                    high=mid-1;
                    mid=(high+low)/2;
                }
            if(d[low]==q || d[high]==q) f=1;
            if(f)
            break;}
           if(f==1)
            printf("YES\n");
            else
            printf("NO\n");
            f=0;
    }}
    return 0;
}