1 files changed, 38 insertions, 4 deletions

diff --git a/ue5/mean_mark.hpp b/ue5/mean_mark.hpp
index f35910c..ba5a230 100644
--- a/ue5/mean_mark.hpp
+++ b/ue5/mean_mark.hpp
@@ -2,19 +2,53 @@
 #define MEAN_MARK_H
 
 #undef SOLVED_3
-//#define SOLVED_3
+#define SOLVED_3
 
 namespace Ti
 {
 
   template <typename Iter>
-    double mean_mark(Iter first, Iter last);
+    double mean_mark(Iter first, Iter last)
+    {
+      double result = 0;
+      unsigned count = 0;
+      for(; first != last; ++first)
+      {
+        result += (*first)->mark();
+        ++count;
+      }
+      return (count == 0) ? 0 : result / count;
+    }
 
   template <typename Iter>
-    double mean_mark_student(Iter first, Iter last);
+    double mean_mark_student(Iter first, Iter last)
+    {
+      double result = 0;
+      unsigned count = 0;
+      for(; first != last; ++first)
+      {
+        if (typeid(*(*first)) != typeid(Student))
+          continue;
+        result += (*first)->mark();
+        ++count;
+      }
+      return (count == 0) ? 0 : result / count;
+    }
 
   template <class ForwardIterator>
-    ForwardIterator remove_greater (ForwardIterator first, ForwardIterator last, int mark);
+    ForwardIterator remove_greater (ForwardIterator first, ForwardIterator last, int mark)
+    {
+      ForwardIterator result = first;
+      for (; first != last; ++first)
+      {
+        if ((*first)->mark() <= mark)
+        {
+          *result = *first;
+          ++result;
+        }
+      }
+      return result;
+    }
 
 }