diff --git a/src/main/java/contest/y2023/BW98.java b/src/main/java/contest/y2023/BW98.java
new file mode 100644
index 0000000..ce05ac5
--- /dev/null
+++ b/src/main/java/contest/y2023/BW98.java
@@ -0,0 +1,76 @@
+package contest.y2023;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class BW98 {
+    public static void main(String[] args) {
+        BW98 solution = new BW98();
+        System.out.println(solution.minMaxDifference(456));
+    }
+
+    public long[] handleQuery(int[] nums1, int[] nums2, int[][] queries) {
+        long sum = Arrays.stream(nums2).sum();
+        List<Long> list = new ArrayList<>();
+        for (int[] query : queries) {
+            if (query[0] == 1) {
+                for (int i = query[1]; i <= query[2]; i++) {
+                    nums1[i] = 1 - nums1[i];
+                }
+            } else if (query[0] == 2) {
+                sum += (long) query[1] * Arrays.stream(nums1).sum();
+            } else {
+                list.add(sum);
+            }
+        }
+        long[] res = new long[list.size()];
+        for (int i = 0; i < list.size(); i++) {
+            res[i] = list.get(i);
+        }
+        return res;
+    }
+
+    public int minImpossibleOR(int[] nums) {
+        List<Integer> list = Arrays.stream(nums).boxed().collect(Collectors.toList());
+        int num = 1;
+        while (list.contains(num)) {
+            num *= 2;
+        }
+        return num;
+    }
+
+    public int minimizeSum(int[] nums) {
+        if (nums.length == 3) {
+            return 0;
+        }
+        Arrays.sort(nums);
+        int min = nums[nums.length - 3] - nums[0];
+        min = Math.min(min, nums[nums.length - 2] - nums[1]);
+        min = Math.min(min, nums[nums.length - 1] - nums[2]);
+        return min;
+    }
+
+    public int minMaxDifference(int num) {
+        String str = "" + num;
+        String max = "";
+        for (int i = 0; i < str.length(); i++) {
+            if (str.charAt(i) != '9') {
+                max = str.replace(str.substring(i, i + 1), "9");
+                break;
+            }
+        }
+        if (max.equals("")) {
+            max = str;
+        }
+        String min = str.replace(str.substring(0, 1), "0");
+        while (min.startsWith("0")) {
+            min = min.substring(1);
+        }
+        if (min.equals("")) {
+            min = "0";
+        }
+        return Integer.parseInt(max) - Integer.parseInt(min);
+    }
+}