1 files changed, 33 insertions, 0 deletions
diff --git a/challenge-247/ulrich-rieke/cpp/ch-2.cpp b/challenge-247/ulrich-rieke/cpp/ch-2.cpp
new file mode 100755
index 0000000000..694cd3f0fb
--- /dev/null
+++ b/challenge-247/ulrich-rieke/cpp/ch-2.cpp
@@ -0,0 +1,33 @@
+#include <vector>
+#include <iostream>
+#include <algorithm>
+#include <utility>
+#include <string>
+#include <map>
+
+bool mySorter( const std::pair<std::string , int> 
+      & p1 , const std::pair<std::string , int> & p2 ) {
+   if ( p1.second != p2.second ) {
+      return p1.second > p2.second ;
+   }
+   else {
+      return p1.first < p2.first ;
+   }
+}
+
+int main( ) {
+   std::cout << "Enter a string consisting of lowercase letters only!\n" ;
+   std::string line ;
+   std::cin >> line ;
+   int len = line.length( ) ;
+   std::map<std::string , int> frequencies ;
+   for ( int pos = 0 ; pos < len - 1 ; pos++ ) {
+      frequencies[ line.substr( pos , 2 )]++ ;
+   }
+   std::vector<std::pair<std::string , int>> allPairs ( frequencies.begin( ) ,
+	 frequencies.end( ) ) ;
+   std::sort( allPairs.begin( ) , allPairs.end( ) , mySorter ) ;
+   std::cout << allPairs[0].first << std::endl ;
+   return 0 ;
+}
+