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-rw-r--r--c++.html.markdown4
1 files changed, 4 insertions, 0 deletions
diff --git a/c++.html.markdown b/c++.html.markdown
index 8be5a278..225472cb 100644
--- a/c++.html.markdown
+++ b/c++.html.markdown
@@ -1057,6 +1057,8 @@ cout << ST.size(); // will print the size of set ST
// Output: 0
// NOTE: for duplicate elements we can use multiset
+// NOTE: For hash sets, use unordered_set. They are more effecient but
+// do not preserve order. unordered_set is available since C++11
// Map
// Maps store elements formed by a combination of a key value
@@ -1084,6 +1086,8 @@ cout << it->second;
// Output: 26
+// NOTE: For hash maps, use unordered_map. They are more effecient but do
+// not preserve order. unordered_map is available since C++11.
///////////////////////////////////
// Logical and Bitwise operators