1 files changed, 40 insertions, 0 deletions
diff --git a/challenge-256/ulrich-rieke/cpp/ch-1.cpp b/challenge-256/ulrich-rieke/cpp/ch-1.cpp
new file mode 100755
index 0000000000..3fe241b75b
--- /dev/null
+++ b/challenge-256/ulrich-rieke/cpp/ch-1.cpp
@@ -0,0 +1,40 @@
+#include <vector>
+#include <iostream>
+#include <set>
+#include <string>
+#include <algorithm>
+#include <iterator>
+
+std::vector<std::string> split( const std::string & startline ,
+      const std::string & sep ) {
+   std::vector<std::string> separated ;
+   std::string::size_type start { 0 } ;
+   std::string::size_type pos ;
+   do {
+      pos = startline.find_first_of( sep , start ) ;
+      separated.push_back( startline.substr(start , pos - start )) ;
+      start = pos + 1 ;
+   } while ( pos != std::string::npos ) ;
+   return separated ;
+}
+
+int main( ) {
+   std::cout << "Enter some strings, separated by blanks!\n" ;
+   std::string line ;
+   std::getline( std::cin , line ) ;
+   std::vector<std::string> words { split( line , " " ) } ;
+   std::set<std::string> ortho( words.begin( ) , words.end( ) ) ;
+   std::set<std::string> reversed ;
+   for ( auto w : words ) {
+      std::string for_reverse { w } ;
+      std::reverse( for_reverse.begin( ) , for_reverse.end( ) ) ;
+      reversed.insert( for_reverse ) ;
+   }
+   std::set<std::string> common ;
+   std::set_intersection( ortho.begin( ) , ortho.end( ) ,
+	 reversed.begin( ) , reversed.end( ) , std::inserter( common , 
+	    common.begin( ) ) ) ;
+   std::cout << common.size( ) / 2 << '\n' ;
+   return 0 ;
+}
+