1 files changed, 38 insertions, 0 deletions
diff --git a/challenge-321/ulrich-rieke/cpp/ch-1.cpp b/challenge-321/ulrich-rieke/cpp/ch-1.cpp
new file mode 100755
index 0000000000..6dc8d9402b
--- /dev/null
+++ b/challenge-321/ulrich-rieke/cpp/ch-1.cpp
@@ -0,0 +1,38 @@
+#include <vector>
+#include <iostream>
+#include <sstream>
+#include <string>
+#include <numeric>
+#include <set>
+
+std::vector<std::string> split( const std::string & text , char delimiter ) {
+   std::vector<std::string> tokens ;
+   std::string word ;
+   std::istringstream istr { text } ;
+   while ( std::getline( istr , word , delimiter ) ) 
+      tokens.push_back( word ) ;
+   return tokens ;
+}
+
+int main( ) {
+   std::cout << "Enter some numbers , their total number must be even!\n" ;
+   std::string line ;
+   std::getline( std::cin , line ) ;
+   auto tokens { split( line , ' ' ) } ;
+   std::vector<double> numbers ;
+   for ( auto s : tokens ) 
+      numbers.push_back( std::stod( s ) ) ;
+   std::set<double> averages ;
+   while ( numbers.size( ) > 0 ) {
+      auto maxpos = std::max_element( numbers.begin( ) , numbers.end( ) ) ;
+      auto maxi = *maxpos ;
+      numbers.erase( maxpos ) ;
+      auto minpos = std::min_element( numbers.begin( ) , numbers.end( ) ) ;
+      auto mini = *minpos ;
+      numbers.erase( minpos ) ;
+      double average = ( maxi + mini ) / 2.0 ;
+      averages.insert( average ) ;
+   }
+   std::cout << averages.size( ) << '\n' ;
+   return 0 ;
+}