10 files changed, 422 insertions, 0 deletions
diff --git a/challenge-115/roger-bell-west/perl/ch-1.pl b/challenge-115/roger-bell-west/perl/ch-1.pl
new file mode 100755
index 0000000000..55218babb2
--- /dev/null
+++ b/challenge-115/roger-bell-west/perl/ch-1.pl
@@ -0,0 +1,38 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 4;
+
+is(sc(qw(abc dea cd)),1,'example 1');
+is(sc(qw(ade cbd fgh)),0,'example 2');
+is(sc(qw(abc dea fgh hif)),0,'example 3');
+is(sc(qw(abc dec cfa cgd)),1,'example 4');
+
+sub sc {
+  my @n=@_;
+  my @m;
+  my %i;
+  foreach my $t (@n) {
+    push @m,substr($t,-1,1);
+    push @{$i{substr($t,0,1)}},$#m;
+  }
+  my @chain=([0]);
+  while (@chain) {
+    my $stub=pop @chain;
+    my %v=map {$_ => 1} (0..$#n);
+    map {delete $v{$_}} @{$stub};
+    if (%v) {
+      if (exists $i{$m[$stub->[-1]]}) {
+        my @x=grep {exists $v{$_}} @{$i{$m[$stub->[-1]]}};
+        foreach my $x (@x) {
+          push @chain,[@{$stub},$x];
+        }
+      }
+    } else {
+      return 1;
+    }
+  }
+  return 0;
+}
diff --git a/challenge-115/roger-bell-west/perl/ch-2.pl b/challenge-115/roger-bell-west/perl/ch-2.pl
new file mode 100755
index 0000000000..7da435464d
--- /dev/null
+++ b/challenge-115/roger-bell-west/perl/ch-2.pl
@@ -0,0 +1,32 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 4;
+
+is(lm(1,0,2,6),6210,'example 1');
+is(lm(1,4,2,8),8412,'example 2');
+is(lm(4,1,7,6),7614,'example 3');
+is(lm(1,3,5,7),0,'example 4');
+
+use List::Util qw(first);
+
+sub lm {
+  my @o=sort @_;
+  my $t=first {$_ % 2 == 0} @o;
+  unless (defined $t) {
+    return 0;
+  }
+  my $i=0;
+  while (1) {
+    if ($o[$i]==$t) {
+      last;
+    }
+    $i++;
+  }
+  splice @o,$i,1;
+  @o=reverse @o;
+  push @o,$t;
+  return join('',@o);
+}
diff --git a/challenge-115/roger-bell-west/python/ch-1.py b/challenge-115/roger-bell-west/python/ch-1.py
new file mode 100755
index 0000000000..04f265e13b
--- /dev/null
+++ b/challenge-115/roger-bell-west/python/ch-1.py
@@ -0,0 +1,43 @@
+#! /usr/bin/python3
+
+import unittest
+
+from collections import defaultdict
+
+def sc(*n):
+  m=list()
+  i=defaultdict(list)
+  for t in n:
+    m.append(t[-1])
+    i[t[0]].append(len(m)-1)
+  chain=list([[0]])
+  while len(chain)>0:
+    stub=chain.pop()
+    v=set(range(len(n)))
+    for x in stub:
+      v.remove(x)
+    if len(v)>0:
+      if m[stub[-1]] in i:
+        for x in filter (lambda y: y in v, i[m[stub[-1]]]):
+          s=stub
+          s.append(x)
+          chain.append(s)
+    else:
+      return 1
+  return 0
+
+class TestSc(unittest.TestCase):
+
+        def test_ex1(self):
+          self.assertEqual(sc('abc','dea','cd'),1,'example 1')
+          
+        def test_ex2(self):
+          self.assertEqual(sc('ade','cbd','fgh'),0,'example 2')
+
+        def test_ex3(self):
+          self.assertEqual(sc('abc','dea','fgh','hif'),0,'example 3')
+          
+        def test_ex4(self):
+          self.assertEqual(sc('abc','dec','cfa','cgd'),1,'example 4')
+
+unittest.main()
diff --git a/challenge-115/roger-bell-west/python/ch-2.py b/challenge-115/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..97a2409d51
--- /dev/null
+++ b/challenge-115/roger-bell-west/python/ch-2.py
@@ -0,0 +1,37 @@
+#! /usr/bin/python3
+
+import unittest
+
+def lm(*n):
+  o=list(n)
+  o.sort()
+  ff=[i for i in range(len(o)) if o[i] % 2 == 0]
+  if len(ff)==0:
+    return 0
+  i=ff[0]
+  ox=list()
+  ox.append(o[i])
+  if i>0:
+    for j in range(i):
+      ox.append(o[j])
+  if i+1<len(o):
+    for j in range(i+1,len(o)):
+      ox.append(o[j])
+  ox.reverse()
+  return int(''.join(str(i) for i in ox))
+
+class TestSc(unittest.TestCase):
+
+        def test_ex1(self):
+          self.assertEqual(lm(1,0,2,6),6210,"example 1")
+  
+        def test_ex2(self):
+          self.assertEqual(lm(1,4,2,8),8412,"example 2")
+  
+        def test_ex3(self):
+          self.assertEqual(lm(4,1,7,6),7614,"example 3")
+  
+        def test_ex4(self):
+          self.assertEqual(lm(1,3,5,7),0,"example 4")
+
+unittest.main()
diff --git a/challenge-115/roger-bell-west/raku/ch-1.p6 b/challenge-115/roger-bell-west/raku/ch-1.p6
new file mode 100755
index 0000000000..5594dc7dfd
--- /dev/null
+++ b/challenge-115/roger-bell-west/raku/ch-1.p6
@@ -0,0 +1,44 @@
+#! /usr/bin/perl6
+
+use Test;
+
+plan 4;
+
+is(sc('abc','dea','cd'),1,'example 1');
+is(sc('ade','cbd','fgh'),0,'example 2');
+is(sc('abc','dea','fgh','hif'),0,'example 3');
+is(sc('abc','dec','cfa','cgd'),1,'example 4');
+
+sub sc(**@n) {
+  my @m;
+  my %i;
+  for @n -> $t {
+    push @m,substr($t,*-1,1);
+    my $ss=substr($t,0,1);
+    if %i{$ss}:exists {
+      push @(%i{$ss}),@m.end;
+    } else {
+      %i{$ss}=[@m.end];
+    }
+  }
+  my @chain=([0]);
+  while (@chain) {
+    my @stub=pop @chain;
+    @stub=@stub».List.flat;
+    my $v=SetHash.new(0..@n.end);
+    map {$v{$_}:delete}, @stub;
+    if ($v) {
+      if (%i{@m[@stub[*-1]]}:exists) {
+        my @x=grep {$v{$_}:exists}, @(%i{@m[@stub[*-1]]});
+        for @x -> $x {
+          my @s=@stub».List.flat;
+          push @s,$x;
+          push @chain,@s;
+        }
+      }
+    } else {
+      return 1;
+    }
+  }
+  return 0;
+}
diff --git a/challenge-115/roger-bell-west/raku/ch-2.p6 b/challenge-115/roger-bell-west/raku/ch-2.p6
new file mode 100755
index 0000000000..21fdadf26b
--- /dev/null
+++ b/challenge-115/roger-bell-west/raku/ch-2.p6
@@ -0,0 +1,22 @@
+#! /usr/bin/perl6
+
+use Test;
+
+plan 4;
+
+is(lm(1,0,2,6),6210,'example 1');
+is(lm(1,4,2,8),8412,'example 2');
+is(lm(4,1,7,6),7614,'example 3');
+is(lm(1,3,5,7),0,'example 4');
+
+sub lm(**@n) {
+  my @o=sort @n;
+  my ($i,$t)=@o.first({$_ % 2 == 0}, :kv);
+  unless (defined $i) {
+    return 0;
+  }
+  splice @o,$i,1;
+  @o=reverse @o;
+  push @o,$t;
+  return join('',@o);
+}
diff --git a/challenge-115/roger-bell-west/ruby/ch-1.rb b/challenge-115/roger-bell-west/ruby/ch-1.rb
new file mode 100755
index 0000000000..1eb4ad336b
--- /dev/null
+++ b/challenge-115/roger-bell-west/ruby/ch-1.rb
@@ -0,0 +1,56 @@
+#! /usr/bin/ruby
+# coding: utf-8
+
+require 'test/unit'
+
+require 'set'
+
+def sc(*n)
+  m=[]
+  i=Hash.new
+  n.each {|t|
+    m.push(t[-1])
+    ss=t[0]
+    if i.has_key?(ss) then
+      i[ss].push(m.length-1)
+    else
+      i[ss]=[m.length-1]
+    end
+  }
+  chain=[[0]]
+  while (chain.length>0)
+    stub=chain.pop
+    v=Set.new(0.upto(n.length-1))
+    stub.map{|x| v.delete(x)}
+    if v.length>0 then
+      if i.has_key?(m[stub[-1]]) then
+        x=i[m[stub[-1]]].find_all {|x| v.include?(x)}
+        x.each {|xx|
+          s=stub
+          s.push(xx)
+          chain.push(s)
+        }
+      end
+    else
+      return 1
+    end
+  end
+  return 0
+end
+
+class TestSc < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal(1,sc('abc','dea','cd'))
+  end
+  def test_ex2
+    assert_equal(0,sc('ade','cbd','fgh'))
+  end
+  def test_ex3
+    assert_equal(0,sc('abc','dea','fgh','hif'))
+  end
+  def test_ex4
+    assert_equal(1,sc('abc','dec','cfa','cgd'))
+  end
+  
+end
diff --git a/challenge-115/roger-bell-west/ruby/ch-2.rb b/challenge-115/roger-bell-west/ruby/ch-2.rb
new file mode 100755
index 0000000000..617e9acb9e
--- /dev/null
+++ b/challenge-115/roger-bell-west/ruby/ch-2.rb
@@ -0,0 +1,42 @@
+#! /usr/bin/ruby
+# coding: utf-8
+
+require 'test/unit'
+
+def lm(*n)
+  o=n.sort()
+  i=o.find_index {|x| x % 2 == 0}
+  if i.nil? then
+    return 0
+  end
+  ox=[o[i]]
+  if i>0 then
+    ox.push(o[0..i-1])
+  end
+  if i+1<o.length() then
+    ox.push(o[i+1..-1])
+  end
+  ox.flatten!
+  return ox.reverse().join('').to_i
+end
+
+
+class TestLm < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal(6210,lm(1,0,2,6))
+  end
+  
+  def test_ex2
+    assert_equal(8412,lm(1,4,2,8))
+  end
+  
+  def test_ex3
+    assert_equal(7614,lm(4,1,7,6))
+  end
+  
+  def test_ex4
+    assert_equal(0,lm(1,3,5,7))
+  end
+  
+end
diff --git a/challenge-115/roger-bell-west/rust/ch-1.rs b/challenge-115/roger-bell-west/rust/ch-1.rs
new file mode 100755
index 0000000000..856f46fbcb
--- /dev/null
+++ b/challenge-115/roger-bell-west/rust/ch-1.rs
@@ -0,0 +1,64 @@
+#! /bin/sh
+//usr/bin/env rustc --test $0 -o ${0}x && ./${0}x; rm -f ${0}x ; exit
+
+use std::collections::{HashMap,HashSet};
+
+#[test]
+fn test_ex1() {
+    assert_eq!(sc(vec!["abc","dea","cd"]),1);
+}
+
+#[test]
+fn test_ex2() {
+    assert_eq!(sc(vec!["ade","cbd","fgh"]),0);
+}
+
+#[test]
+fn test_ex3() {
+    assert_eq!(sc(vec!["abc","dea","fgh","hif"]),0);
+}
+
+#[test]
+fn test_ex4() {
+    assert_eq!(sc(vec!["abc","dec","cfa","cgd"]),1);
+}
+
+fn sc (n: Vec<&str>) -> i8 {
+    let mut m: Vec<String>=vec![];
+    let mut i: HashMap<String,Vec<usize>>=HashMap::new();
+    for t in &n {
+        m.push(t[t.len()-1..].to_string());
+        let ss=&t.chars().nth(0).unwrap().to_string();
+        let mut vv: Vec<usize>=vec![];
+        if i.contains_key(ss) {
+            vv=i.get(ss).unwrap().to_vec();
+        }
+        vv.push(m.len()-1);
+        i.insert(ss.to_string(),vv);
+    }
+    let mut chain: Vec<Vec<usize>>=vec![vec![0]];
+    while chain.len()>0 {
+        let stub=chain.pop().unwrap();
+        let mut v: HashSet<usize>=HashSet::new();
+        for y in 0..n.len() {
+            v.insert(y);
+        }
+        for y in &stub {
+            v.remove(&y);
+        }
+        if v.len()>0 {
+            if i.contains_key(&m[stub[stub.len()-1]]) {
+                let xx=i.get(&m[stub[stub.len()-1]]).unwrap();
+                let xx=xx.iter().filter(|x| v.contains(&x));
+                for x in xx {
+                    let mut s=stub.clone();
+                    s.push(*x);
+                    chain.push(s);
+                }
+            }
+        } else {
+            return 1;
+        }
+    }
+    return 0;
+}
diff --git a/challenge-115/roger-bell-west/rust/ch-2.rs b/challenge-115/roger-bell-west/rust/ch-2.rs
new file mode 100755
index 0000000000..bbdba109ff
--- /dev/null
+++ b/challenge-115/roger-bell-west/rust/ch-2.rs
@@ -0,0 +1,44 @@
+#! /bin/sh
+//usr/bin/env rustc --test $0 -o ${0}x && ./${0}x; rm -f ${0}x ; exit
+
+#[test]
+fn test_ex1() {
+    assert_eq!(sc(vec![1,0,2,6]),6210);
+}
+
+#[test]
+fn test_ex2() {
+    assert_eq!(sc(vec![1,4,2,8]),8412);
+}
+
+#[test]
+fn test_ex3() {
+    assert_eq!(sc(vec![4,1,7,6]),7614);
+}
+
+#[test]
+fn test_ex4() {
+    assert_eq!(sc(vec![1,3,5,7]),0);
+}
+
+fn sc (n: Vec<u32>) -> u32 {
+    let mut o=n.clone();
+    o.sort();
+    let mut ov=o.clone().into_iter();
+    let m=ov.position(|x| x % 2 == 0);
+    let i: usize;
+    match m {
+        None => return 0,
+        Some(x) => i=x,
+    }
+    println!("{:?}",i);
+    let mut ox: Vec<u32>=vec![o[i]];
+    if i>0 {
+        ox.append(&mut o[0..i].to_vec());
+    }
+    if i+1<o.len() {
+        ox.append(&mut o[i+1..o.len()].to_vec());
+    }
+    ox.reverse();
+    return ox.into_iter().map(|i| i.to_string()).collect::<Vec<String>>().join("").parse::<u32>().unwrap();
+}