AOE还是单体？ 题解
AOE还是单体？
https://ac.nowcoder.com/acm/contest/5600/A
考点：贪心
我们可以用性价比来看。
如果我们花费x能打掉大于x的血量，我们肯定优先选择用第二种方法呀
反之我们就用第一种方法。
import java.util.*;
import java.math.*;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.StreamTokenizer;
import java.io.OutputStreamWriter;
import java.io.BufferedReader;
import java.io.PrintWriter;
public class Main {
public static HashMap<Integer,Long>map = new HashMap<>();
public static void main(String args[])throws IOException {
StreamTokenizer in = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
in.nextToken();
int n = (int)in.nval;
in.nextToken();
int x = (int)in.nval;
int num[] = new int[n];
for(int i=0;i<n;i++)
{
in.nextToken();
num[i] = (int)in.nval;
}
Arrays.sort(num);
long sum=0;
if(n>x)
{
sum=x*num[n-x-1];
for(int i=n-x;i<n;i++)
sum+=num[i];
sum-=(x*num[n-x-1]);
out.print(sum);
}
else{
for(int i=0;i<n;i++)
sum+=num[i];
out.print(sum);
}
out.flush();
}
} 
