1 files changed, 59 insertions, 0 deletions
diff --git a/challenge-248/ulrich-rieke/cpp/ch-2.cpp b/challenge-248/ulrich-rieke/cpp/ch-2.cpp
new file mode 100755
index 0000000000..a20957bbd9
--- /dev/null
+++ b/challenge-248/ulrich-rieke/cpp/ch-2.cpp
@@ -0,0 +1,59 @@
+#include <iostream> 
+#include <string> 
+#include <vector>
+
+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 ;
+}
+
+void print( const std::vector<int> & numbers ) {
+   std::cout << "  ( " ;
+   for ( int i : numbers ) {
+      std::cout << i << " " ;
+   }
+   std::cout << ")\n" ;
+}
+
+int main( ) {
+   std::cout << "Enter a matrix by inputting an equal number of integers per line!\n" ;
+   std::cout << "Enter <return> to end!\n" ;
+   std::vector<std::vector<int>> matrix ;
+   std::string line ;
+   std::getline( std::cin , line ) ;
+   while ( line.length( ) > 0 ) {
+      std::vector<std::string> linenumbers ( split( line , " " ) ) ;
+      std::vector<int> numbers ;
+      for ( auto s : linenumbers ) 
+	 numbers.push_back( std::stoi( s ) ) ;
+      matrix.push_back( numbers ) ;
+      std::getline( std::cin , line ) ;
+   }
+   int matrixlen = matrix.size( ) ;
+   int rowlen = matrix[0].size( ) ;
+   std::vector<std::vector<int>> result ;
+   for ( int r = 0 ; r < matrixlen - 1 ; r++ ) {
+      std::vector<int> resultline ;
+      for ( int col = 0 ; col < rowlen - 1 ; col++ ) {
+	 int sum = matrix[ r ][col] + matrix[r][ col + 1 ] +
+	    matrix[ r + 1][ col ] + matrix[ r + 1 ][ col + 1 ] ;
+	 resultline.push_back( sum ) ;
+      }
+      result.push_back( resultline ) ;
+   }
+   std::cout << "(\n" ;
+   for ( const auto & numline : result ) {
+      print( numline ) ;
+   }
+   std::cout << ")\n" ;
+   return 0 ;
+}
+