Create Minimize the heights I

Minimize the heights I

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+//Minimize the heights I
+
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int t = Integer.parseInt(br.readLine().trim());
+
+        while(t-- > 0) {
+            int k = Integer.parseInt(br.readLine().trim());
+            String input = br.readLine().trim();
+            String[] tokens = input.split(" ");
+            int[] arr = new int[tokens.length];
+
+            for(int i = 0; i < tokens.length; i++) {
+                arr[i] = Integer.parseInt(tokens[i]);
+            }
+
+            Solution ob = new Solution();
+
+            int res = ob.getMinDiff(k, arr);
+
+            System.out.println(res);
+            System.out.println("~");
+        }
+    }
+}
+
+class Solution {
+    public int getMinDiff(int k, int[] arr) {
+        int n = arr.length;
+
+        Arrays.sort(arr);
+
+        int diff = arr[n - 1] - arr[0];
+        int smallest = arr[0] + k;
+        int largest = arr[n - 1] - k;
+        int min, max;
+
+        for(int i = 0; i < n - 1; i++) {
+            min = Math.min(smallest, arr[i + 1] - k);
+            max = Math.max(largest, arr[i] + k);
+
+            diff = Math.min(diff, max - min);
+        }
+
+        return diff;
+    }
+}