1 files changed, 44 insertions, 0 deletions
diff --git a/challenge-241/ulrich-rieke/cpp/ch-1.cpp b/challenge-241/ulrich-rieke/cpp/ch-1.cpp
new file mode 100755
index 0000000000..c446abe90c
--- /dev/null
+++ b/challenge-241/ulrich-rieke/cpp/ch-1.cpp
@@ -0,0 +1,44 @@
+#include <vector>
+#include <iostream>
+#include <string>
+#include <algorithm>
+
+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 at least 3 positive integers in ascending order!\n" ;
+   std::string line ;
+   std::getline( std::cin , line ) ;
+   std::cout << "Enter a positive integer!\n" ;
+   int diff ;
+   std::cin >> diff ;
+   std::vector<std::string> numberstrings { split( line , " " ) } ;
+   std::vector<int> numbers ;
+   for ( auto s : numberstrings ) 
+      numbers.push_back( std::stoi( s ) ) ;
+   int result = 0 ;
+   int len = numbers.size( ) ;
+   for ( int i = 0 ; i < len - 2 ; i++ ) {
+      for ( int j = i + 1 ; j < len - 1 ; j++ ) {
+	 for ( int k = j + 1 ; k < len ; k++ ) {
+	    if ( numbers[ j ] - numbers[ i ] == diff 
+		  && numbers[ k ] - numbers[ j ] == diff ) 
+	       result++ ;
+	 }
+      }
+   }
+   std::cout << result << std::endl ;
+   return 0 ;
+}
+