diff --git a/Medium/Day11/Problem.txt b/Medium/Day11/Problem.txt
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+++ b/Medium/Day11/Problem.txt
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+Imagine we have a range of numbers from  n  to  m. How many of these numbers have unique digits in each position?
+In other words, no two digits next to each other can be the same.
+
+Constraints
+
+0 <= n <= m <= 10^18
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diff --git a/Medium/Day11/Sample.txt b/Medium/Day11/Sample.txt
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+++ b/Medium/Day11/Sample.txt
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+Input:
+123 321
+
+Output:
+171
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diff --git a/Medium/Day11/Solution.cpp b/Medium/Day11/Solution.cpp
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+++ b/Medium/Day11/Solution.cpp
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+// Write Your code here
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