CPP: add Happy Number solution (IEEEXtreme style)

Mojirade18 · Mojirade18 · commit db6168c3c017 · 2025-10-20T22:55:48.000+01:00
diff --git a/CPP/Basics/happy_number.cpp b/CPP/Basics/happy_number.cpp
@@ -1,4 +1,5 @@
-// happy_number.cpp
+// Problem: Happy Number
+// Language: C++
 // Problem: Happy Number (IEEEXtreme / LeetCode 202 style)
 // Description:
 //   A number is "happy" if repeatedly replacing the number by the sum of the
