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- import java.util.Arrays;
- import java.util.Scanner;
- public class Main {
- public static void main(String[] args) {
- Scanner sc= new Scanner(System.in);
- int n= sc.nextInt();
- int l= sc.nextInt();
- int[] num= new int[n];
- for(int i = 0; i < n; i++){
- num[i]= sc.nextInt();
- }
- Arrays.sort(num);
- double maxreqrad= Math.max(num[0], l-num[n-1]);
- for(int i = 1; i < n; i++) {
- double RequiredRadius = (num[i]-num[i-1]) / 2.0;
- if (RequiredRadius > maxreqrad) maxreqrad=RequiredRadius;
- }
- System.out.println(maxreqrad);
- }
- }
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