Update SHORT_NOTES_on_STL.md

raihankhan · web-flow · commit d2bda154a420 · 2019-12-18T16:54:38.000+06:00
diff --git a/SHORT_NOTES_on_STL.md b/SHORT_NOTES_on_STL.md
@@ -1 +1,7 @@
+##Standard template Library (STL)
 
+map is a very important STL used in competitive programming. Map is implemented using Red-Black Tree. Maps store values in the form of a combination of a key value and a mapped value.
+
+lower_bound()
+upper_bound()
+find()
