1 files changed, 39 insertions, 0 deletions
diff --git a/challenge-308/ulrich-rieke/cpp/ch-1.cpp b/challenge-308/ulrich-rieke/cpp/ch-1.cpp
new file mode 100755
index 0000000000..409cea5b7c
--- /dev/null
+++ b/challenge-308/ulrich-rieke/cpp/ch-1.cpp
@@ -0,0 +1,39 @@
+#include <iostream>
+#include <string>
+#include <sstream>
+#include <vector>
+#include <map>
+
+std::vector<std::string> split( const std::string & text , char delimiter ) {
+   std::vector<std::string> tokens ;
+   std::istringstream istr { text } ;
+   std::string word ;
+   while ( std::getline( istr , word , delimiter ) ) {
+      tokens.push_back( word ) ;
+   }
+   return tokens ;
+}
+
+int main( ) {
+   std::cout << "Enter some words separated by whitespace!\n" ;
+   std::string line ;
+   std::getline( std::cin , line ) ;
+   auto firstTokens { split( line , ' ' ) } ;
+   std::string secondline ;
+   std::cout << "Enter some more words separated by whitespace!\n" ;
+   std::getline( std::cin , secondline ) ;
+   auto secondTokens { split( secondline , ' ' ) } ;
+   std::map<std::string , int> firstFrequency , secondFrequency ;
+   int common = 0 ;
+   for ( auto s : firstTokens ) 
+      firstFrequency[s]++ ;
+   for ( auto s : secondTokens ) 
+      secondFrequency[s]++ ;
+   for ( auto aPair : firstFrequency ) {
+      if ( secondFrequency.find( aPair.first ) != secondFrequency.end( ) ) {
+	 common++ ;
+      }
+   }
+   std::cout << common << '\n' ;
+   return 0 ;
+}