Update README.md

AnghelLeonard · web-flow · commit 9db9e8fc29ca · 2018-12-08T08:07:09.000+02:00
diff --git a/binarytree/README.md b/binarytree/README.md
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+# Binary Search Tree
 
+**What kind of problems are commonly solved via binary search tree:**
+
+- Commonly used in search applications having data entering/leaving in a constant way (e.g., *map*/*set* objects languages libraries.
