diff --git a/cpp/2302/230227.cpp b/cpp/2302/230227.cpp
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+++ b/cpp/2302/230227.cpp
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+/**
+ * 427. Construct Quad Tree
+ * Given a n * n matrix grid of 0's and 1's only. We want to represent the grid with a Quad-Tree.
+ * Return the root of the Quad-Tree representing the grid.
+ *
+ * Refer: 220429-CN.cpp
+ */