1 files changed, 44 insertions, 0 deletions
diff --git a/challenge-193/ulrich-rieke/cpp/ch-1.cpp b/challenge-193/ulrich-rieke/cpp/ch-1.cpp
new file mode 100644
index 0000000000..67e5eae34d
--- /dev/null
+++ b/challenge-193/ulrich-rieke/cpp/ch-1.cpp
@@ -0,0 +1,44 @@
+#include <iostream>
+#include <string>
+#include <algorithm>
+#include <cstdlib>
+#include <vector>
+
+std::string toBinaryString( int n , int len ) {
+  std::string binary ;
+  while ( n != 0 ) {
+      binary.append( std::to_string( n % 2 )) ;
+      n /= 2 ;
+  }
+  while ( binary.length( ) < len )
+      binary.append( "0" ) ;
+  std::reverse( binary.begin( ) , binary.end( ) ) ;
+  return binary ;
+}
+
+int main( int argc , char * argv[] ) {
+  if ( argc != 2 ) {
+      std::cerr << "usage : <programname> <number of ones>!\n" ;
+      return 1 ;
+  }
+  else {
+      int n = std::atoi( argv[ 1 ] ) ;
+      int sum = 0 ;
+      int multiplier = 1 ;
+      for ( int i = 0 ; i < n ; i++ ) {
+    sum += multiplier ;
+    multiplier *= 2 ;
+      }
+      std::vector<std::string> allBinaries ;
+      for ( int i = 0 ; i < sum + 1 ; i++ ) {
+    allBinaries.push_back( toBinaryString( i , n )) ;
+      }
+      for ( const auto & str : allBinaries ) {
+    std::cout << str ;
+    if ( str != allBinaries.back( ) )
+        std::cout << ", " ;
+      }
+      std::cout << std::endl ;
+      return 0 ;
+  }
+}