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import java.io.BufferedReader; import java.io.InputStreamReader; import java.util.Arrays; public class Main { static int N, sum, topSum, bottomSum; static int[] arr; static double answer, personNum; public static void main(String[] args) throws Exception { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); N = Integer.parseInt(br.readLine()); arr = new int[N]; for (int i =..