[ACM] ZOJ 3819 Average Score (水题）

Average Score

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Time Limit: 2 Seconds      Memory Limit: 65536 KB

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Bob is a freshman in Marjar University. He is clever and diligent. However, he is not good at math, especially in Mathematical Analysis.

After a mid-term exam, Bob was anxious about his grade. He went to the professor asking about the result of the exam. The professor said:

"Too bad! You made me so disappointed."

"Hummm... I am giving lessons to two classes. If you were in the other class, the average scores of both classes will increase."

Now, you are given the scores of all students in the two classes, except for the Bob's. Please calculate the possible range of Bob's score. All scores shall be integers within [0, 100].

Input

There are multiple test cases. The first line of input contains an integer T indicating the number of test cases. For each test case:

The first line contains two integers N (2 <= N <= 50) and M (1 <= M <= 50) indicating the number of students in Bob's class and the number
of students in the other class respectively.

The next line contains N - 1 integers A₁, A₂, .., A_N-1 representing the scores of other students in Bob's
class.

The last line contains M integers B₁, B₂, .., B_M representing the scores of students in the other class.

Output

For each test case, output two integers representing the minimal possible score and the maximal possible score of Bob.

It is guaranteed that the solution always exists.

Sample Input

2
4 3
5 5 5
4 4 3
6 5
5 5 4 5 3
1 3 2 2 1

Sample Output

4 4
2 4

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Author: JIANG, Kai

Source: The 2014 ACM-ICPC Asia Mudanjiang Regional Contest

解题思路：

题意为 bob所在的班有n个人，每人都有一个成绩，另外一个班有m个人。没人都有一个成绩，假设把bob放到还有一个班里去。那么两班的平均分都比原来的班内平均分要高，问符合条件的bob的成绩的范围。

枚举就可以。

代码：

#include <iostream>
#include <cmath>
using namespace std;
int t;
double a[52];
double b[52];
int n,m;
int bob;
int s,e;

int main()
{
    cin>>t;
    while(t--)
    {
        cin>>n>>m;
        double sum1=0.0;
        double sum2=0.0;
        double pre1,pre2;
        for(int i=1;i<=n-1;i++)
        {
            cin>>a[i];
            sum1+=a[i];
        }
        for(int i=1;i<=m;i++)
        {
            cin>>b[i];
            sum2+=b[i];
        }
        bool first=0;
        for(bob =0;bob<=100;bob++)
        {
            pre1=(sum1+bob)/n;
            pre2=(sum2)/m;
            if((sum1)/(n-1)>pre1&&(sum2+bob)/(m+1)>pre2)
            {
                if(first)
                    e=bob;
                if(!first)
                {
                    s=bob;
                    e=bob;
                }
                first=1;
            }

        }
        cout<<s<<" "<<e<<endl;
    }
    return 0;
}