- Added solutions by Eric Cheung.

- Added solutions by Ulrich Rieke.
- Added solutions by Andrew Shitov.
- Added solutions by Peter Meszaros.
- Added solutions by Feng Chang.
- Added solutions by Mark Anderson.
- Added solutions by Peter Campbell Smith.
- Added solutions by E. Choroba.
- Added solutions by W. Luis Mochan.
- Added solutions by David Ferrone.

2 files changed, 65 insertions, 0 deletions

diff --git a/challenge-261/ulrich-rieke/cpp/ch-1.cpp b/challenge-261/ulrich-rieke/cpp/ch-1.cpp
new file mode 100755
index 0000000000..a088bfc147
--- /dev/null
+++ b/challenge-261/ulrich-rieke/cpp/ch-1.cpp
@@ -0,0 +1,30 @@
+#include <iostream>

+#include <numeric>

+#include <vector>

+#include <iterator>

+#include <cstdlib>

+

+int digitsum( int n ) {

+   int sum = 0 ;

+   while ( n != 0 ) {

+      sum += n % 10 ;

+      n /= 10 ;

+   }

+   return sum ;

+}

+

+int main( ) {

+   std::cout << "Enter some integers, separated by blanks!\n" ;

+   std::cout << "Enter e to end!\n" ;

+   std::vector<int> numbers {std::istream_iterator<int>{std::cin} , 

+      std::istream_iterator<int>{}} ;

+   int element_sum = std::accumulate( numbers.begin( ) , numbers.end( ) ,

+	 0 ) ;

+   std::vector<int> digitsums ;

+   for ( int i : numbers ) 

+      digitsums.push_back( digitsum( i ) ) ;

+   int total_digitsums = std::accumulate( digitsums.begin( ) , 

+	 digitsums.end( ) , 0 ) ;

+   std::cout << std::abs( total_digitsums - element_sum) << '\n' ;

+   return 0 ;

+}

diff --git a/challenge-261/ulrich-rieke/cpp/ch-2.cpp b/challenge-261/ulrich-rieke/cpp/ch-2.cpp
new file mode 100755
index 0000000000..e5a956a286
--- /dev/null
+++ b/challenge-261/ulrich-rieke/cpp/ch-2.cpp
@@ -0,0 +1,35 @@
+#include <iostream>

+#include <vector>

+#include <algorithm>

+#include <string>

+

+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 some integers, separated by blanks!\n" ;

+   std::string numberline ;

+   std::getline( std::cin , numberline ) ;

+   std::vector<std::string> innumbers { split( numberline , " " ) } ;

+   std::vector<int> numbers ;

+   for ( auto w : innumbers ) 

+      numbers.push_back( std::stoi( w ) ) ;

+   std::cout << "Enter a start number!\n" ;

+   int start ;

+   std::cin >> start ;

+   while ( std::find( numbers.begin( ) , numbers.end( ) , start ) != 

+	 numbers.end( ) ) 

+      start *= 2 ;

+   std::cout << start << '\n' ;

+   return 0 ;

+}