diff --git a/src/problems/2566-maximum-difference-by-remapping-a-digit.cpp b/src/problems/2566-maximum-difference-by-remapping-a-digit.cpp
new file mode 100644
index 0000000..c7a722b
--- /dev/null
+++ b/src/problems/2566-maximum-difference-by-remapping-a-digit.cpp
@@ -0,0 +1,71 @@
+/**
+* [2566] Maximum Difference by Remapping a Digit
+ */
+#include <bits/stdc++.h>
+#include <gtest/gtest.h>
+using namespace std;
+
+
+// submission codes start here
+
+class Solution
+{
+public:
+    int minMaxDifference(int num)
+    {
+        const string numString = to_string(num);
+
+        // Select the first not 9 number when converting to maximum value.
+        int targetPos = 0;
+        while (targetPos < numString.size() - 1)
+        {
+            if (numString[targetPos] != '9')
+            {
+                break;
+            }
+
+            targetPos += 1;
+        }
+
+        int maxNum = 0;
+
+        char targetChar = numString[targetPos];
+        for (const auto c : numString)
+        {
+            if (c == targetChar)
+            {
+                maxNum = maxNum * 10 + 9;
+            }
+            else
+            {
+                maxNum = maxNum * 10 + c - '0';
+            }
+        }
+
+        // The minimum value is replacing the first number into zero.
+
+        targetChar = numString[0];
+        int minNum = 0;
+        for (const auto c : numString)
+        {
+            if (c == targetChar)
+            {
+                minNum = minNum * 10;
+            }
+            else
+            {
+                minNum = minNum * 10 + c - '0';
+            }
+        }
+
+        return maxNum - minNum;
+    }
+};
+
+// submission codes end
+
+TEST(P2566, Test1)
+{
+    ASSERT_EQ(99009, Solution().minMaxDifference(11891));
+    ASSERT_EQ(99, Solution().minMaxDifference(90));
+}
\ No newline at end of file
diff --git a/src/template.cpp b/src/template.cpp
index 0abb202..6883b56 100644
--- a/src/template.cpp
+++ b/src/template.cpp
@@ -10,9 +10,8 @@ using namespace std;
 
 __PROBLEM_DEFAULT_CODE__
 
-// submission codes endo
+// submission codes end
 
 TEST(__TEST_CASE_NAME__, Test1)
 {
-
-}
+}
\ No newline at end of file