10 files changed, 183 insertions, 0 deletions
diff --git a/challenge-279/ulrich-rieke/cpp/ch-1.cpp b/challenge-279/ulrich-rieke/cpp/ch-1.cpp
new file mode 100755
index 0000000000..8d6d6444c8
--- /dev/null
+++ b/challenge-279/ulrich-rieke/cpp/ch-1.cpp
@@ -0,0 +1,38 @@
+#include <iostream>
+#include <string>
+#include <algorithm>
+#include <utility>
+#include <sstream>
+#include <vector>
+
+std::vector<std::string> tokenize( const std::string & text , char delimiter ) {
+   std::istringstream allTokens { text } ;
+   std::vector<std::string> tokens ;
+   std::string tok ;
+   while ( std::getline( allTokens , tok , delimiter ) ) {
+      tokens.push_back( tok ) ;
+   }
+   return tokens ;
+}
+
+int main( ) {
+   std::cout << "Enter some letters, separated by blanks!\n" ;
+   std::string line ;
+   std::getline( std::cin , line ) ;
+   std::vector<std::string> letterstrings { tokenize( line , ' ' ) } ;
+   std::cout << "Enter some weights, separated by blanks!\n" ;
+   std::getline( std::cin , line ) ;
+   std::vector<std::string> weightstrings { tokenize( line , ' ' ) } ;
+   std::vector<std::pair<char , int>> allPairs ;
+   for ( int i = 0 ; i < letterstrings.size( ) ; i++ ) {
+      allPairs.push_back( std::make_pair( letterstrings[i].front( ) , std::stoi( 
+		  weightstrings[i].substr( 0 , 1 ) ) ) ) ;
+   }
+   std::sort( allPairs.begin( ) , allPairs.end( ) , []( const auto & p1 , const auto & p2) {
+	 return p1.second < p2.second ; } ) ;
+   for ( auto p : allPairs ) 
+      std::cout << p.first ;
+   std::cout << '\n' ;
+   return 0 ;
+}
+      
diff --git a/challenge-279/ulrich-rieke/cpp/ch-2.cpp b/challenge-279/ulrich-rieke/cpp/ch-2.cpp
new file mode 100755
index 0000000000..84455bf78a
--- /dev/null
+++ b/challenge-279/ulrich-rieke/cpp/ch-2.cpp
@@ -0,0 +1,14 @@
+#include <string>
+#include <algorithm>
+#include <iostream>
+
+int main( ) {
+   std::cout << "Enter a string!\n" ;
+   std::string line ;
+   std::getline( std::cin , line ) ;
+   std::string vowels {"aeiouAEIOU"} ;
+   std::cout << std::boolalpha << (std::count_if( line.begin( ) , line.end( ),
+	 [vowels]( char c ) { return vowels.find( c ) != std::string::npos ; 
+	 } ) % 2 == 0 ) << '\n' ;
+   return 0 ;
+}
diff --git a/challenge-279/ulrich-rieke/haskell/ch-1.hs b/challenge-279/ulrich-rieke/haskell/ch-1.hs
new file mode 100755
index 0000000000..eab77a6aa0
--- /dev/null
+++ b/challenge-279/ulrich-rieke/haskell/ch-1.hs
@@ -0,0 +1,16 @@
+module Challenge279
+   where
+import Data.Char ( digitToInt ) 
+import Data.List ( sortOn ) 
+
+solution :: String -> String -> String
+solution letters weights = filter (\c -> c /= ' ' ) $ unwords $ map fst $ sortOn snd $ zip
+ ( words letters ) ( map (\w -> digitToInt $ head w ) $ words weights )
+
+main :: IO ( )
+main = do
+   putStrLn "Enter some letters separated by blanks!" 
+   letterline <- getLine
+   putStrLn "Enter some weights separated by blanks!"
+   weightline <- getLine
+   print $ solution letterline weightline
diff --git a/challenge-279/ulrich-rieke/haskell/ch-2.hs b/challenge-279/ulrich-rieke/haskell/ch-2.hs
new file mode 100755
index 0000000000..8f04f999fe
--- /dev/null
+++ b/challenge-279/ulrich-rieke/haskell/ch-2.hs
@@ -0,0 +1,12 @@
+module Challenge279_2
+   where
+
+solution :: String -> Bool
+solution str = ( length $ filter (\c -> elem c "aeiouAEIOU" ) str ) `mod` 2 
+ == 0 
+
+main :: IO ( ) 
+main = do
+   putStrLn "Enter a string!"
+   line <- getLine
+   print $ solution line
diff --git a/challenge-279/ulrich-rieke/perl/ch-1.pl b/challenge-279/ulrich-rieke/perl/ch-1.pl
new file mode 100755
index 0000000000..6c55640fec
--- /dev/null
+++ b/challenge-279/ulrich-rieke/perl/ch-1.pl
@@ -0,0 +1,17 @@
+#!/usr/bin/perl ;
+use strict ;
+use warnings ;
+use feature 'say' ;
+use List::Util qw ( zip ) ;
+
+say "Enter some letters , separated by blanks!" ;
+my $letters = <STDIN> ;
+chomp $letters ;
+my @letters = split( /\s+/ , $letters ) ;
+say "Enter some weights , separated by blanks!" ;
+my $weights = <STDIN> ;
+chomp $weights ;
+my @weights = split( /\s+/ , $weights ) ;
+my @zipped = zip( \@letters , \@weights ) ;
+my @sorted = sort { $a->[1] <=> $b->[1] } @zipped ;
+say join( '' , map { $_->[0] } @sorted ) ;
diff --git a/challenge-279/ulrich-rieke/perl/ch-2.pl b/challenge-279/ulrich-rieke/perl/ch-2.pl
new file mode 100755
index 0000000000..0d0cfa31b4
--- /dev/null
+++ b/challenge-279/ulrich-rieke/perl/ch-2.pl
@@ -0,0 +1,18 @@
+#!/usr/bin/perl ;
+use strict ;
+use warnings ;
+use feature 'say' ;
+
+#the task amounts to verifying whether the number of vowels in the string
+#is even or odd
+say "Enter a string!" ;
+my $line = <STDIN> ;
+chomp $line ;
+my $vowels = "aeiouAEIOU" ;
+if ( scalar( grep { index( $vowels , $_ ) != -1 } split( // , $line ) ) 
+      % 2 == 0 ) {
+   say "true" ;
+}
+else {
+   say "false" ;
+}
diff --git a/challenge-279/ulrich-rieke/raku/ch-1.raku b/challenge-279/ulrich-rieke/raku/ch-1.raku
new file mode 100755
index 0000000000..99104226cd
--- /dev/null
+++ b/challenge-279/ulrich-rieke/raku/ch-1.raku
@@ -0,0 +1,11 @@
+use v6 ;
+
+say "Enter some letters , separated by blanks!" ;
+my $letters = $*IN.get ;
+say "Enter some weights, separated by blanks!" ; 
+my $weights = $*IN.get ;
+my @letters_in = $letters.words ;
+my @weights_in = $weights.words.map( {.Int} ) ;
+my @pairs = @letters_in Z, @weights_in ;
+my @sorted = @pairs.sort( *.[1] ).map( {$_[0]} ) ;
+say @sorted.join ;
diff --git a/challenge-279/ulrich-rieke/raku/ch-2.raku b/challenge-279/ulrich-rieke/raku/ch-2.raku
new file mode 100755
index 0000000000..e7df535f8f
--- /dev/null
+++ b/challenge-279/ulrich-rieke/raku/ch-2.raku
@@ -0,0 +1,6 @@
+use v6 ;
+
+say "Enter a string!" ;
+my $line = $*IN.get ;
+my @vowels = "aeiouAEIOU".comb ;
+say $line.comb.grep( {$_ (elem) @vowels} ).elems %% 2 ;
diff --git a/challenge-279/ulrich-rieke/rust/ch-1.rs b/challenge-279/ulrich-rieke/rust/ch-1.rs
new file mode 100755
index 0000000000..d0e0429eea
--- /dev/null
+++ b/challenge-279/ulrich-rieke/rust/ch-1.rs
@@ -0,0 +1,33 @@
+use std::io ;
+
+fn main() {
+    println!("Enter some letters!");
+    let mut letterline : String = String::new( ) ;
+    io::stdin( ).read_line( &mut letterline ).unwrap( ) ;
+    let letterstr : &str = letterline.as_str( ).trim( ) ;
+    println!("Enter some weights!") ;
+    let mut weightline : String = String::new( ) ;
+    io::stdin( ).read_line( &mut weightline ).unwrap( ) ;
+    let weightstr : &str = weightline.as_str( ).trim( ) ;
+    let weights : Vec<usize> = weightstr.split_whitespace( ).map( | s | 
+	  s.parse::<usize>( ).unwrap( )).collect( ) ;
+    let mut letters_entered : String = String::new( ) ;
+    for c in letterstr.chars( ) {
+       if c != ' ' {
+	  letters_entered.push( c ) ;
+       }
+    }
+    let single_letters = letters_entered.as_str( ) ;
+    let mut pairs : Vec<(char,usize)> = single_letters.chars( ).zip( weights.into_iter( )).
+       collect( ) ;
+    let pair_slice = pairs.as_mut_slice( ) ;
+    pair_slice.sort_by( | a , b | a.1.cmp( &b.1 )) ;
+    let sorted_pairs : Vec<(char, usize)> = pair_slice.to_vec( ) ;
+    let final_chars : Vec<char> = sorted_pairs.into_iter( ).map( | p | p.0 ).
+       collect( ) ;
+    let mut solution : String = String::new( ) ;
+    for c in final_chars {
+       solution.push( c ) ;
+    }
+    println!("{:?}" , solution ) ;
+}
diff --git a/challenge-279/ulrich-rieke/rust/ch-2.rs b/challenge-279/ulrich-rieke/rust/ch-2.rs
new file mode 100755
index 0000000000..92dcc015f4
--- /dev/null
+++ b/challenge-279/ulrich-rieke/rust/ch-2.rs
@@ -0,0 +1,18 @@
+use std::io ;
+
+fn is_vowel( c : char ) -> bool {
+   let vowels : &str = "aeiouAEIOU" ;
+   vowels.find( c ).is_some( ) 
+}
+
+//the task amounts to verifying whether the number of vowels in the string
+//is even or odd
+fn main() {
+    println!("Enter a string!");
+    let mut inline : String = String::new( ) ;
+    io::stdin( ).read_line( &mut inline ).unwrap( ) ;
+    let entered_line : &str = inline.as_str( ).trim( ) ;
+    let result : bool = entered_line.chars( ).filter( | &c | is_vowel( c ))
+       .count( ) % 2 == 0  ;
+    println!("{}" , result ) ;
+}