diff --git a/cpp/2206/220616.cpp b/cpp/2206/220616.cpp
new file mode 100644
index 0000000..0dceae8
--- /dev/null
+++ b/cpp/2206/220616.cpp
@@ -0,0 +1,6 @@
+/**
+ * 5. Longest Palindromic Substring
+ * Given a string s, return the longest palindromic substring in s.
+ *
+ * Refer: more/0005.cpp
+ */
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