1 files changed, 33 insertions, 0 deletions
diff --git a/challenge-191/ulrich-rieke/cpp/ch-1.cpp b/challenge-191/ulrich-rieke/cpp/ch-1.cpp
new file mode 100644
index 0000000000..35a1da15bf
--- /dev/null
+++ b/challenge-191/ulrich-rieke/cpp/ch-1.cpp
@@ -0,0 +1,33 @@
+#include <iostream>
+#include <vector>
+#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 << "Please enter a number of integers, separated by blanks!\n" ;
+  std::string line ;
+  std::getline( std::cin , line ) ;
+  std::vector<std::string> numberstrings( split( line , " " )) ;
+  std::vector<int> numbers ;
+  for ( auto & s : numberstrings )
+      numbers.push_back( std::stoi( s )) ;
+  int maximum = *std::max_element( numbers.begin( ) , numbers.end( )) ;
+  if ( std::any_of( numbers.begin( ) , numbers.end( ) , [maximum]( const int n ) {
+        return ( n != maximum && maximum < 2 * n ) ; }))
+      std::cout << -1 << std::endl ;
+  else
+      std::cout << 1 << std::endl ;
+  return 0 ;
+}