[cpp][11_sorts] selection_sort, updated [prevent useless swap].

2018-10-17 09:37:30 +08:00 · 2018-10-17 09:37:30 +08:00 · 2dfdfe8a89
commit 2dfdfe8a89
parent 1dfdd7e0fa
1 changed files with 3 additions and 1 deletions
--- a/c-cpp/11_sorts/sorts.hpp
+++ b/c-cpp/11_sorts/sorts.hpp
@ -53,7 +53,9 @@ void selection_sort(BidirIt first,
                tag = itt;
            }
        }
-        std::swap(*it, *tag);
+        if (tag != it) {
+            std::swap(*it, *tag);
+        }
    }
 }