1 files changed, 47 insertions, 0 deletions
diff --git a/challenge-333/ulrich-rieke/cpp/ch-1.cpp b/challenge-333/ulrich-rieke/cpp/ch-1.cpp
new file mode 100755
index 0000000000..dff850ba55
--- /dev/null
+++ b/challenge-333/ulrich-rieke/cpp/ch-1.cpp
@@ -0,0 +1,47 @@
+#include <string>
+#include <vector>
+#include <utility>
+#include <regex> 
+#include <iostream>
+#include <algorithm> 
+using namespace std::string_literals ;
+
+bool on_straight_line( const std::vector<std::pair<int , int>> & coords ) {
+   int first_x = coords[0].first ;
+   int first_y = coords[0].second ;
+   if ( std::all_of( coords.begin( ) , coords.end( ) , [first_x]( auto p ) {
+	    return p.first == first_x ; } ) || std::all_of( coords.begin( ) ,
+	       coords.end( ) , [first_y]( auto b ) { return b.second ==
+	       first_y ; }))
+      return true ;
+   else {
+      double slope_one = (static_cast<double>(coords[1].second) - 
+	    static_cast<double>(coords[0].second )) / (static_cast<double>(
+	       coords[1].first) - static_cast<double>(coords[0].first )) ;
+      double slope_two = (static_cast<double>(coords[2].second) - 
+	    static_cast<double>(coords[1].second )) / (static_cast<double>(
+	       coords[2].first) - static_cast<double>(coords[1].first )) ;
+      return slope_one == slope_two ;
+   }
+}
+
+int main( ) {
+   std::cout << "Enter 3 coordinates in brackets!\n" ;
+   std::string inputline ;
+   std::getline( std::cin , inputline ) ;
+   auto pattern {R"(\d+)"s} ;
+   auto re  = std::regex { pattern } ;
+   std::vector<std::pair<int , int>> coordinates ;
+   std::vector<std::string> numbers ;
+   auto end = std::sregex_token_iterator{} ;
+   for ( auto it = std::sregex_token_iterator { std::begin( inputline ) , 
+	 std::end( inputline ) , re } ; it != end ; ++it ) {
+      numbers.push_back( *it ) ;
+   }
+   for ( int i = 0 ; i < numbers.size( ) - 1 ; i += 2) {
+      coordinates.push_back( std::make_pair( std::stoi( numbers[i] ) , 
+	       std::stoi( numbers[i + 1] ) )) ;
+   }
+   std::cout << std::boolalpha << on_straight_line( coordinates ) << '\n' ;
+   return 0 ;
+}