Merge pull request #12396 from Firedrake/rogerbw-challenge-331

RogerBW solutions for challenge no. 331

25 files changed, 991 insertions, 0 deletions

diff --git a/challenge-331/roger-bell-west/crystal/ch-1.cr b/challenge-331/roger-bell-west/crystal/ch-1.cr
new file mode 100755
index 0000000000..e5a65495d9
--- /dev/null
+++ b/challenge-331/roger-bell-west/crystal/ch-1.cr
@@ -0,0 +1,19 @@
+#! /usr/bin/crystal
+
+def lastword(a)
+  w = a.split(" ").select{|x| x.size > 0}
+  w[w.size - 1].size
+end
+
+require "spec"
+describe "lastword" do
+  it "test_ex1" do
+    lastword("The Weekly Challenge").should eq 9
+  end
+  it "test_ex2" do
+    lastword("   Hello   World    ").should eq 5
+  end
+  it "test_ex3" do
+    lastword("Let's begin the fun").should eq 3
+  end
+end
diff --git a/challenge-331/roger-bell-west/crystal/ch-2.cr b/challenge-331/roger-bell-west/crystal/ch-2.cr
new file mode 100755
index 0000000000..356a415ef7
--- /dev/null
+++ b/challenge-331/roger-bell-west/crystal/ch-2.cr
@@ -0,0 +1,33 @@
+#! /usr/bin/crystal
+
+def buddystrings(a, b)
+  ac = a.chars
+  bc = b.chars
+  0.upto(ac.size - 1) do |i|
+    (i + 1).upto(ac.size - 1) do |j|
+      acx = ac.clone
+      acx[i] = ac[j]
+      acx[j] = ac[i]
+      if acx == bc
+        return true
+      end
+    end
+  end
+  false
+end
+
+require "spec"
+describe "buddystrings" do
+  it "test_ex1" do
+    buddystrings("fuck", "fcuk").should eq true
+  end
+  it "test_ex2" do
+    buddystrings("love", "love").should eq false
+  end
+  it "test_ex3" do
+    buddystrings("fodo", "food").should eq true
+  end
+  it "test_ex4" do
+    buddystrings("feed", "feed").should eq true
+  end
+end
diff --git a/challenge-331/roger-bell-west/javascript/ch-1.js b/challenge-331/roger-bell-west/javascript/ch-1.js
new file mode 100755
index 0000000000..a36fb0d113
--- /dev/null
+++ b/challenge-331/roger-bell-west/javascript/ch-1.js
@@ -0,0 +1,27 @@
+#! /usr/bin/node
+
+"use strict"
+
+function lastword(a) {
+    let w = a.split(" ").filter(i => i.length > 0);
+    return w[w.length - 1].length;
+}
+
+if (lastword('The Weekly Challenge') == 9) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (lastword('   Hello   World    ') == 5) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (lastword("Let's begin the fun") == 3) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write("\n");
diff --git a/challenge-331/roger-bell-west/javascript/ch-2.js b/challenge-331/roger-bell-west/javascript/ch-2.js
new file mode 100755
index 0000000000..ce508eac40
--- /dev/null
+++ b/challenge-331/roger-bell-west/javascript/ch-2.js
@@ -0,0 +1,43 @@
+#! /usr/bin/node
+
+"use strict"
+
+function buddystrings(a, b) {
+    let ac = a.split("");
+    for (let i = 0; i < a.length - 1; i++) {
+        for (let j = i + 1; j < a.length; j++) {
+            let acx = a.split("");
+            acx[i] = ac[j];
+            acx[j] = ac[i];
+            if (acx.join("") == b) {
+                return true;
+            }
+        }
+    }
+    return false;
+}
+
+if (buddystrings('fuck', 'fcuk')) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (!buddystrings('love', 'love')) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (buddystrings('fodo', 'food')) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (buddystrings('feed', 'feed')) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write("\n");
diff --git a/challenge-331/roger-bell-west/kotlin/ch-1.kt b/challenge-331/roger-bell-west/kotlin/ch-1.kt
new file mode 100644
index 0000000000..33f0131e0a
--- /dev/null
+++ b/challenge-331/roger-bell-west/kotlin/ch-1.kt
@@ -0,0 +1,27 @@
+fun lastword(a: String): Int {
+    val w = a.split(" ").filter {it.length > 0}
+    return w[w.size - 1].length
+}
+
+fun main() {
+
+    if (lastword("The Weekly Challenge") == 9) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (lastword("   Hello   World    ") == 5) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (lastword("Let's begin the fun") == 3) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    println("")
+
+}
diff --git a/challenge-331/roger-bell-west/kotlin/ch-2.kt b/challenge-331/roger-bell-west/kotlin/ch-2.kt
new file mode 100644
index 0000000000..c351b9f3fd
--- /dev/null
+++ b/challenge-331/roger-bell-west/kotlin/ch-2.kt
@@ -0,0 +1,44 @@
+fun buddystrings(a: String, b: String): Boolean {
+    val ac = a.toCharArray().toList()
+    val bc = b.toCharArray().toList()
+    for (i in 0 .. a.length - 2) {
+        for (j in i + 1 .. a.length - 1) {
+            var acx = ArrayList(ac)
+            acx[i] = ac[j]
+            acx[j] = ac[i]
+            if (acx.toList() == bc) {
+                return true
+            }
+        }
+    }
+    return false
+}
+
+fun main() {
+
+    if (buddystrings("fuck", "fcuk")) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (!buddystrings("love", "love")) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (buddystrings("fodo", "food")) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (buddystrings("feed", "feed")) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    println("")
+
+}
diff --git a/challenge-331/roger-bell-west/lua/ch-1.lua b/challenge-331/roger-bell-west/lua/ch-1.lua
new file mode 100755
index 0000000000..87efdcffa1
--- /dev/null
+++ b/challenge-331/roger-bell-west/lua/ch-1.lua
@@ -0,0 +1,59 @@
+#! /usr/bin/lua
+
+function splits(inputstr, sep)
+   sep = sep or '%s'
+   local starts = {1}
+   local ends = {}
+   local n = 1
+   while true do
+      local fs, fe = string.find(inputstr, sep, n)
+      if fs == nil then
+         break
+      end
+      table.insert(ends, fs - 1)
+      table.insert(starts, fe + 1)
+      n = fe + 1
+   end
+   table.insert(ends, #inputstr)
+   local t = {}
+   for i = 1, #starts do
+      local s = starts[i]
+      local e = ends[i]
+      if e >= s then
+         table.insert(t, string.sub(inputstr, s, e))
+      end
+   end
+   return t
+end
+
+function lastword(a)
+   local w = splits(a, " ")
+   for i = #w, 1, -1 do
+      if #(w[i]) > 0 then
+         return #(w[i])
+      end
+   end
+   return 0
+end
+
+if lastword("The Weekly Challenge") == 9 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if lastword("   Hello   World    ") == 5 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if lastword("Let's begin the fun") == 3 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+
diff --git a/challenge-331/roger-bell-west/lua/ch-2.lua b/challenge-331/roger-bell-west/lua/ch-2.lua
new file mode 100755
index 0000000000..5d1049e608
--- /dev/null
+++ b/challenge-331/roger-bell-west/lua/ch-2.lua
@@ -0,0 +1,62 @@
+#! /usr/bin/lua
+
+function split(t)
+   local cl = {}
+   string.gsub(t,
+               "(.)",
+               function(c)
+                  table.insert(cl, c)
+               end
+   )
+   return cl
+end
+
+function join(t)
+   local out=""
+   for i, v in ipairs(t) do
+      out = out .. v
+   end
+   return out
+end
+
+function buddystrings(a, b)
+   for i = 1, #a - 1 do
+      for j = i + 1, #a do
+         local acx = split(a)
+         acx[i], acx[j] = acx[j], acx[i]
+         if join(acx) == b then
+            return true
+         end
+      end
+   end
+   return false
+end
+
+if buddystrings("fuck", "fcuk") then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if not buddystrings("love", "love") then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if buddystrings("fodo", "food") then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if buddystrings("feed", "feed") then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+
diff --git a/challenge-331/roger-bell-west/perl/ch-1.pl b/challenge-331/roger-bell-west/perl/ch-1.pl
new file mode 100755
index 0000000000..baa9df0915
--- /dev/null
+++ b/challenge-331/roger-bell-west/perl/ch-1.pl
@@ -0,0 +1,16 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+use experimental 'signatures';
+
+use Test::More tests => 3;
+
+is(lastword('The Weekly Challenge'), 9, 'example 1');
+is(lastword('   Hello   World    '), 5, 'example 2');
+is(lastword("Let's begin the fun"), 3, 'example 3');
+
+sub lastword($a) {
+  my @w = grep {length($a) > 0} split ' ', $a;
+  length($w[-1]);
+}
diff --git a/challenge-331/roger-bell-west/perl/ch-2.pl b/challenge-331/roger-bell-west/perl/ch-2.pl
new file mode 100755
index 0000000000..0e174969a4
--- /dev/null
+++ b/challenge-331/roger-bell-west/perl/ch-2.pl
@@ -0,0 +1,27 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+use experimental 'signatures';
+
+use Test::More tests => 4;
+
+is(buddystrings('fuck', 'fcuk'), 1, 'example 1');
+is(buddystrings('love', 'love'), 0, 'example 2');
+is(buddystrings('fodo', 'food'), 1, 'example 3');
+is(buddystrings('feed', 'feed'), 1, 'example 4');
+
+sub buddystrings($a, $b) {
+  my @ac = split '', $a;
+  foreach my $i (0 .. $#ac - 1) {
+    foreach my $j ($i + 1 .. $#ac) {
+      my @acx = split '', $a;;
+      $acx[$i] = $ac[$j];
+      $acx[$j] = $ac[$i];
+      if (join("", @acx) eq $b) {
+        return 1;
+      }
+    }
+  }
+  0;
+}
diff --git a/challenge-331/roger-bell-west/postscript/ch-1.ps b/challenge-331/roger-bell-west/postscript/ch-1.ps
new file mode 100644
index 0000000000..fbb97830e2
--- /dev/null
+++ b/challenge-331/roger-bell-west/postscript/ch-1.ps
@@ -0,0 +1,75 @@
+%!PS
+
+% begin included library code
+% see https://codeberg.org/Firedrake/postscript-libraries/
+/test.start {
+    print (:) print
+    /test.pass 0 def
+    /test.count 0 def
+} bind def
+
+/test {
+    /test.count test.count 1 add def
+    {
+        /test.pass test.pass 1 add def
+    } {
+        ( ) print
+        test.count (....) cvs print
+        (-fail) print
+    } ifelse
+} bind def
+
+/test.end {
+    ( ) print
+    test.count 0 gt {
+        (Passed ) print
+        test.pass (...) cvs print
+        (/) print
+        test.count (...) cvs print
+        ( \() print
+        test.pass 100 mul test.count idiv (...) cvs print
+        (%\)) print
+        (\r\n) print
+    } if
+} bind def
+
+/strsplit % (ajbjc) (j) -> [ (a) (b) (c) ]
+{
+    1 dict begin
+    /sep exch def
+    [ exch
+      {
+          dup length 0 eq {
+              pop
+              exit
+          } {
+              sep search {
+                  exch pop
+                  dup length 0 eq {
+                      pop
+                  } {
+                      exch
+                  } ifelse
+              } {
+                  ()
+              } ifelse
+          } ifelse
+      } loop
+    ]
+    end
+} bind def
+
+
+% end included library code
+
+/lastword {
+    ( ) strsplit
+    dup length 1 sub get
+    length
+} bind def
+
+(lastword) test.start
+(The Weekly Challenge) lastword 9 eq test
+(   Hello   World    ) lastword 5 eq test
+(Let's begin the fun) lastword 3 eq test
+test.end
diff --git a/challenge-331/roger-bell-west/postscript/ch-2.ps b/challenge-331/roger-bell-west/postscript/ch-2.ps
new file mode 100644
index 0000000000..b5032bafbc
--- /dev/null
+++ b/challenge-331/roger-bell-west/postscript/ch-2.ps
@@ -0,0 +1,167 @@
+%!PS
+
+% begin included library code
+% see https://codeberg.org/Firedrake/postscript-libraries/
+/deepcopy {
+    2 dict begin
+    /a exch def
+    a type /dicttype eq {
+        <<
+            a keys {
+                /k exch def
+                k
+                a k get deepcopy
+            } forall
+        >>
+    } {
+        a type /arraytype eq {
+            [
+                a {
+                    deepcopy
+                } forall
+            ]
+        } {
+            a type /stringtype eq {
+                a dup length string cvs
+            } {
+                a
+            } ifelse
+        } ifelse
+    } ifelse
+    end
+} bind def
+
+/deepeq {
+    2 dict begin
+    /a exch def
+    /b exch def
+    a type b type eq {
+        a type /dicttype eq {
+            a length b length eq {
+                <<
+                    a {
+                        pop
+                        true
+                    } forall
+                    b {
+                        pop
+                        true
+                    } forall
+                >>
+                true exch
+                {
+                    pop
+                    dup a exch known {
+                        dup b exch known {
+                            dup a exch get exch b exch get deepeq not {
+                                pop false
+                            } if
+                        } {
+                            false
+                        } ifelse
+                    } {
+                        false
+                    } ifelse
+                } forall
+            } {
+                false
+            } ifelse
+        } {
+            a type dup /arraytype eq exch /stringtype eq or {
+                a length b length eq {
+                    true
+                    0 1 a length 1 sub {
+                        dup a exch get exch b exch get deepeq not {
+                            pop false
+                            exit
+                        } if
+                    } for
+                } {
+                    false
+                } ifelse
+            } {
+                a b eq
+            } ifelse
+        } ifelse
+    } {
+        false
+    } ifelse
+    end
+} bind def
+
+/keys { % dict -> array of dict keys
+    [ exch
+      {
+          pop
+      } forall
+    ]
+} bind def
+
+/test.start {
+    print (:) print
+    /test.pass 0 def
+    /test.count 0 def
+} bind def
+
+/s2a {
+    [ exch { } forall ]
+} bind def
+
+/test {
+    /test.count test.count 1 add def
+    {
+        /test.pass test.pass 1 add def
+    } {
+        ( ) print
+        test.count (....) cvs print
+        (-fail) print
+    } ifelse
+} bind def
+
+/test.end {
+    ( ) print
+    test.count 0 gt {
+        (Passed ) print
+        test.pass (...) cvs print
+        (/) print
+        test.count (...) cvs print
+        ( \() print
+        test.pass 100 mul test.count idiv (...) cvs print
+        (%\)) print
+        (\r\n) print
+    } if
+} bind def
+
+
+% end included library code
+
+/buddystrings {
+    0 dict begin
+    s2a /bc exch def
+    s2a /ac exch def
+    false
+    0 1 ac length 2 sub {
+        /i exch def
+        i 1 add 1 ac length 1 sub {
+            /j exch def
+            /acx ac deepcopy def
+            acx i ac j get put
+            acx j ac i get put
+            acx bc deepeq {
+                pop true
+                exit
+            } if
+        } for
+        dup {
+            exit
+        } if
+    } for
+    end
+} bind def
+
+(buddystrings) test.start
+(fuck) (fcuk) buddystrings test
+(love) (love) buddystrings not test
+(fodo) (food) buddystrings test
+(feed) (feed) buddystrings test
+test.end
diff --git a/challenge-331/roger-bell-west/python/ch-1.py b/challenge-331/roger-bell-west/python/ch-1.py
new file mode 100755
index 0000000000..57d8acf1ba
--- /dev/null
+++ b/challenge-331/roger-bell-west/python/ch-1.py
@@ -0,0 +1,19 @@
+#! /usr/bin/python3
+
+def lastword(a):
+  w = [wx for wx in a.split(" ") if len(wx) > 0]
+  return len(w[-1])
+import unittest
+
+class TestLastword(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(lastword("The Weekly Challenge"), 9, 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(lastword("   Hello   World    "), 5, 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(lastword("Let's begin the fun"), 3, 'example 3')
+
+unittest.main()
diff --git a/challenge-331/roger-bell-west/python/ch-2.py b/challenge-331/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..02b40869c3
--- /dev/null
+++ b/challenge-331/roger-bell-west/python/ch-2.py
@@ -0,0 +1,29 @@
+#! /usr/bin/python3
+
+def buddystrings(a, b):
+  bc = list(b)
+  for i in range(len(a) - 1):
+    for j in range(i + 1, len(a)):
+      acx = list(a)
+      acx[i] = a[j]
+      acx[j] = a[i]
+      if acx == bc:
+        return True
+  return False
+import unittest
+
+class TestBuddystrings(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(buddystrings("fuck", "fcuk"), True, 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(buddystrings("love", "love"), False, 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(buddystrings("fodo", "food"), True, 'example 3')
+
+  def test_ex4(self):
+    self.assertEqual(buddystrings("feed", "feed"), True, 'example 4')
+
+unittest.main()
diff --git a/challenge-331/roger-bell-west/raku/ch-1.p6 b/challenge-331/roger-bell-west/raku/ch-1.p6
new file mode 100755
index 0000000000..de69404593
--- /dev/null
+++ b/challenge-331/roger-bell-west/raku/ch-1.p6
@@ -0,0 +1,14 @@
+#! /usr/bin/raku
+
+use Test;
+
+plan 3;
+
+is(lastword('The Weekly Challenge'), 9, 'example 1');
+is(lastword('   Hello   World    '), 5, 'example 2');
+is(lastword("Let's begin the fun"), 3, 'example 3');
+
+sub lastword($a) {
+    my @w = $a.split(' ').grep({$_.chars > 0});
+    @w[*-1].chars;
+}
diff --git a/challenge-331/roger-bell-west/raku/ch-2.p6 b/challenge-331/roger-bell-west/raku/ch-2.p6
new file mode 100755
index 0000000000..8a1ccdaf8a
--- /dev/null
+++ b/challenge-331/roger-bell-west/raku/ch-2.p6
@@ -0,0 +1,25 @@
+#! /usr/bin/raku
+
+use Test;
+
+plan 4;
+
+is(buddystrings('fuck', 'fcuk'), True, 'example 1');
+is(buddystrings('love', 'love'), False, 'example 2');
+is(buddystrings('fodo', 'food'), True, 'example 3');
+is(buddystrings('feed', 'feed'), True, 'example 4');
+
+sub buddystrings($a, $b) {
+    my @ac = $a.comb;
+    for (0 .. @ac.elems - 2) -> $i {
+        for ($i + 1 .. @ac.elems - 1) -> $j {
+            my @acx = $a.comb;
+            @acx[$i] = @ac[$j];
+            @acx[$j] = @ac[$i];
+            if (@acx.join("") eq $b) {
+                return True;
+            }
+        }
+    }
+    False;
+}
diff --git a/challenge-331/roger-bell-west/ruby/ch-1.rb b/challenge-331/roger-bell-west/ruby/ch-1.rb
new file mode 100755
index 0000000000..c1ae05d3c5
--- /dev/null
+++ b/challenge-331/roger-bell-west/ruby/ch-1.rb
@@ -0,0 +1,24 @@
+#! /usr/bin/ruby
+
+def lastword(a)
+  w = a.split(" ").select{|x| x.size > 0}
+  w[w.size - 1].size
+end
+
+require 'test/unit'
+
+class TestLastword < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal(9, lastword('The Weekly Challenge'))
+  end
+
+  def test_ex2
+    assert_equal(5, lastword('   Hello   World    '))
+  end
+
+  def test_ex3
+    assert_equal(3, lastword("Let's begin the fun"))
+  end
+
+end
diff --git a/challenge-331/roger-bell-west/ruby/ch-2.rb b/challenge-331/roger-bell-west/ruby/ch-2.rb
new file mode 100755
index 0000000000..e4ae1991c0
--- /dev/null
+++ b/challenge-331/roger-bell-west/ruby/ch-2.rb
@@ -0,0 +1,39 @@
+#! /usr/bin/ruby
+
+def buddystrings(a, b)
+  ac = a.chars
+  bc = b.chars
+  0.upto(ac.size - 1) do |i|
+    (i + 1).upto(ac.size - 1) do |j|
+      acx = ac.clone
+      acx[i] = ac[j]
+      acx[j] = ac[i]
+      if acx == bc
+        return true
+      end
+    end
+  end
+  false
+end
+
+require 'test/unit'
+
+class TestBuddystrings < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal(true, buddystrings('fuck', 'fcuk'))
+  end
+
+  def test_ex2
+    assert_equal(false, buddystrings('love', 'love'))
+  end
+
+  def test_ex3
+    assert_equal(true, buddystrings('fodo', 'food'))
+  end
+
+  def test_ex4
+    assert_equal(true, buddystrings('feed', 'feed'))
+  end
+
+end
diff --git a/challenge-331/roger-bell-west/rust/ch-1.rs b/challenge-331/roger-bell-west/rust/ch-1.rs
new file mode 100755
index 0000000000..bb05832219
--- /dev/null
+++ b/challenge-331/roger-bell-west/rust/ch-1.rs
@@ -0,0 +1,22 @@
+#! /bin/sh
+//usr/bin/env rustc --test $0 -o ${0}x && ./${0}x --nocapture; rm -f ${0}x ; exit
+
+#[test]
+fn test_ex1() {
+    assert_eq!(lastword("The Weekly Challenge"), 9);
+}
+
+#[test]
+fn test_ex2() {
+    assert_eq!(lastword("   Hello   World    "), 5);
+}
+
+#[test]
+fn test_ex3() {
+    assert_eq!(lastword("Let's begin the fun"), 3);
+}
+
+fn lastword(a: &str) -> usize {
+    let w = a.split(" ").filter(|x| x.len() > 0).collect::<Vec<_>>();
+    w[w.len() - 1].len()
+}
diff --git a/challenge-331/roger-bell-west/rust/ch-2.rs b/challenge-331/roger-bell-west/rust/ch-2.rs
new file mode 100755
index 0000000000..c0dad8bc91
--- /dev/null
+++ b/challenge-331/roger-bell-west/rust/ch-2.rs
@@ -0,0 +1,38 @@
+#! /bin/sh
+//usr/bin/env rustc --test $0 -o ${0}x && ./${0}x --nocapture; rm -f ${0}x ; exit
+
+#[test]
+fn test_ex1() {
+    assert_eq!(buddystrings("fuck", "fcuk"), true);
+}
+
+#[test]
+fn test_ex2() {
+    assert_eq!(buddystrings("love", "love"), false);
+}
+
+#[test]
+fn test_ex3() {
+    assert_eq!(buddystrings("fodo", "food"), true);
+}
+
+#[test]
+fn test_ex4() {
+    assert_eq!(buddystrings("feed", "feed"), true);
+}
+
+fn buddystrings(a: &str, b: &str) -> bool {
+    let ac = a.chars().collect::<Vec<_>>();
+    let bc = b.chars().collect::<Vec<_>>();
+    for i in 0 .. ac.len() - 1 {
+        for j in i + 1 .. ac.len() {
+            let mut acx = ac.clone();
+            acx[i] = ac[j];
+            acx[j] = ac[i];
+            if acx == bc {
+                return true;
+            }
+        }
+    }
+    false
+}
diff --git a/challenge-331/roger-bell-west/scala/ch-1.scala b/challenge-331/roger-bell-west/scala/ch-1.scala
new file mode 100644
index 0000000000..03471037d3
--- /dev/null
+++ b/challenge-331/roger-bell-west/scala/ch-1.scala
@@ -0,0 +1,28 @@
+
+object Lastword {
+  def lastword(a: String): Int = {
+    val w = a.split(" ").filter (x => x.length > 0)
+    w(w.size - 1).length
+  }
+  def main(args: Array[String]) {
+    if (lastword("The Weekly Challenge") == 9) {
+      print("Pass")
+    } else {
+      print("Fail")
+    }
+    print(" ")
+    if (lastword("   Hello   World    ") == 5) {
+      print("Pass")
+    } else {
+      print("Fail")
+    }
+    print(" ")
+    if (lastword("Let's begin the fun") == 3) {
+      print("Pass")
+    } else {
+      print("Fail")
+    }
+    println("")
+
+  }
+}
diff --git a/challenge-331/roger-bell-west/scala/ch-2.scala b/challenge-331/roger-bell-west/scala/ch-2.scala
new file mode 100644
index 0000000000..22727508e6
--- /dev/null
+++ b/challenge-331/roger-bell-west/scala/ch-2.scala
@@ -0,0 +1,47 @@
+import scala.collection.mutable.ListBuffer
+
+object Buddystrings {
+  def buddystrings(a: String, b: String): Boolean = {
+    val ac = a.to[ListBuffer]
+    val bc = b.to[ListBuffer]
+    var v = false
+    for (i <- 0 until a.length - 1) {
+      for (j <- i + 1 until a.length) {
+        var acx = a.to[ListBuffer]
+        acx(i) = ac(j)
+        acx(j) = ac(i)
+        if (acx == bc) {
+          v = true
+        }
+      }
+    }
+    v
+  }
+  def main