二分贪心-U

Description

Little Bob likes playing with his box of bricks. He puts the bricks one upon another and builds stacks of different height. "Look, I've built a wall!", he tells his older sister Alice. "Nah, you should make all stacks the same height. Then you would have a real wall.", she retorts. After a little con- sideration, Bob sees that she is right. So he sets out to rearrange the bricks, one by one, such that all stacks are the same height afterwards. But since Bob is lazy he wants to do this with the minimum number of bricks moved. Can you help? 

Input

The input consists of several data sets. Each set begins with a line containing the number n of stacks Bob has built. The next line contains n numbers, the heights hi of the n stacks. You may assume 1 <= n <= 50 and 1 <= hi <= 100. 

The total number of bricks will be divisible by the number of stacks. Thus, it is always possible to rearrange the bricks such that all stacks have the same height. 

The input is terminated by a set starting with n = 0. This set should not be processed. 

Output

For each set, first print the number of the set, as shown in the sample output. Then print the line "The minimum number of moves is k.", where k is the minimum number of bricks that have to be moved in order to make all the stacks the same height. 

Output a blank line after each set.

Sample Input

65 2 4 1 7 50

Sample Output

Set #1
The minimum number of moves is 5.
这道题大致的意思是将不同高度的几摞砖头移动成同样高度需要移动多少块砖头。先求平均值，再用比平均值大的数减去平均值，所有差的和就是所求的移动砖头的数量。
下面是我的AC代码：
#include<iostream>#include<cstdio>  #include<cstring>  #define N 56  using namespace std;int main(){      int n, t = 1;      int num[N];      while (scanf("%d", &n), n)    {           memset(num, 0, sizeof(num));          int sum = 0, aver;         for (int i = 0; i < n; i++)        {              scanf("%d", &num[i]);              sum += num[i];          }          aver=sum/n;          sum=0;          for (int i = 0; i < n; i++)        {              if (num[i]<aver)  sum=sum+aver-num[i];          }          cout<<"Set #"<<t++<<endl;          printf("The minimum number of moves is %d.\n\n", sum);      }      return 0;
}