Merge pull request #10325 from Firedrake/rogerbw-challenge-275

RogerBW solutions for challenge no. 275

23 files changed, 1003 insertions, 0 deletions

diff --git a/challenge-275/roger-bell-west/crystal/ch-1.cr b/challenge-275/roger-bell-west/crystal/ch-1.cr
new file mode 100755
index 0000000000..3358f9d540
--- /dev/null
+++ b/challenge-275/roger-bell-west/crystal/ch-1.cr
@@ -0,0 +1,26 @@
+#! /usr/bin/crystal
+
+def brokenkeys(a, k)
+  out = 0
+  failset = Set.new(k.map{ |c| c.downcase })
+  a.split(" ").each do |word|
+    wordset = Set.new(word.downcase.split(""))
+    if (wordset & failset).size == 0
+      out += 1
+    end
+  end
+  out
+end
+
+require "spec"
+describe "brokenkeys" do
+  it "test_ex1" do
+    brokenkeys("Perl Weekly Challenge", ["l", "a"]).should eq 0
+  end
+  it "test_ex2" do
+    brokenkeys("Perl and Raku", ["a"]).should eq 1
+  end
+  it "test_ex3" do
+    brokenkeys("Well done Team PWC", ["l", "o"]).should eq 2
+  end
+end
diff --git a/challenge-275/roger-bell-west/crystal/ch-2.cr b/challenge-275/roger-bell-west/crystal/ch-2.cr
new file mode 100755
index 0000000000..136354dfd9
--- /dev/null
+++ b/challenge-275/roger-bell-west/crystal/ch-2.cr
@@ -0,0 +1,32 @@
+#! /usr/bin/crystal
+
+def replacedigits(a)
+  out = ""
+  prev = 0
+  a.chars.each do |c|
+    out += case c
+           when .number?
+             (prev + c.to_i).chr
+           else
+             prev = c.ord
+             c
+           end
+  end
+  out
+end
+
+require "spec"
+describe "replacedigits" do
+  it "test_ex1" do
+    replacedigits("a1c1e1").should eq "abcdef"
+  end
+  it "test_ex2" do
+    replacedigits("a1b2c3d4").should eq "abbdcfdh"
+  end
+  it "test_ex3" do
+    replacedigits("b2b").should eq "bdb"
+  end
+  it "test_ex4" do
+    replacedigits("a16z").should eq "abgz"
+  end
+end
diff --git a/challenge-275/roger-bell-west/javascript/ch-1.js b/challenge-275/roger-bell-west/javascript/ch-1.js
new file mode 100755
index 0000000000..08d76e96ab
--- /dev/null
+++ b/challenge-275/roger-bell-west/javascript/ch-1.js
@@ -0,0 +1,35 @@
+#! /usr/bin/node
+
+"use strict"
+
+function brokenkeys(a, k) {
+    let out = 0;
+    const failset = new Set(k.map(c => c.toLowerCase()))
+    for (let word of a.split(" ")) {
+        const wordset = new Set(word.toLowerCase().split(""));
+        const intersect = new Set([...failset].filter(i => wordset.has(i)));
+        if (intersect.size == 0) {
+            out++;
+        }
+    }
+    return out;
+}
+
+if (brokenkeys('Perl Weekly Challenge', ['l', 'a']) == 0) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (brokenkeys('Perl and Raku', ['a']) == 1) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (brokenkeys('Well done Team PWC', ['l', 'o']) == 2) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write("\n");
diff --git a/challenge-275/roger-bell-west/javascript/ch-2.js b/challenge-275/roger-bell-west/javascript/ch-2.js
new file mode 100755
index 0000000000..db3ee7311a
--- /dev/null
+++ b/challenge-275/roger-bell-west/javascript/ch-2.js
@@ -0,0 +1,42 @@
+#! /usr/bin/node
+
+"use strict"
+
+function replacedigits(a) {
+    let out = "";
+    let prev = 0;
+    for (let c of a.split("")) {
+        if (c >= '0' && c <= '9') {
+            out += String.fromCharCode(prev + parseInt(c, 10));
+        } else {
+            prev = c.charCodeAt(0);
+            out += c;
+        }
+    }
+    return out;
+}
+
+if (replacedigits('a1c1e1') == 'abcdef') {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (replacedigits('a1b2c3d4') == 'abbdcfdh') {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (replacedigits('b2b') == 'bdb') {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (replacedigits('a16z') == 'abgz') {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write("\n");
diff --git a/challenge-275/roger-bell-west/kotlin/ch-1.kt b/challenge-275/roger-bell-west/kotlin/ch-1.kt
new file mode 100644
index 0000000000..d657dc5156
--- /dev/null
+++ b/challenge-275/roger-bell-west/kotlin/ch-1.kt
@@ -0,0 +1,34 @@
+fun brokenkeys(a: String, k: List<Char>): Int {
+    var out = 0
+    val failset: Set<Char> = k.map{it.lowercaseChar()}.toSet()
+    for (word in a.split(" ")) {
+        val wordset: Set<Char> = word.lowercase().toSet()
+        if (failset.intersect(wordset).isEmpty()) {
+            out += 1
+        }
+    }
+    return out
+}
+
+fun main() {
+
+    if (brokenkeys("Perl Weekly Challenge", listOf('l', 'a')) == 0) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (brokenkeys("Perl and Raku", listOf('a')) == 1) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (brokenkeys("Well done Team PWC", listOf('l', 'o')) == 2) {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    println("")
+
+}
diff --git a/challenge-275/roger-bell-west/kotlin/ch-2.kt b/challenge-275/roger-bell-west/kotlin/ch-2.kt
new file mode 100644
index 0000000000..78838490d3
--- /dev/null
+++ b/challenge-275/roger-bell-west/kotlin/ch-2.kt
@@ -0,0 +1,42 @@
+fun replacedigits(a: String): String {
+    var out = ""
+    var prev = 0
+    for (c in a.toList()) {
+        if (c >= '0' && c <= '9') {
+            out += (prev + c.digitToInt()).toChar()
+        } else {
+            prev = c.code
+            out += c
+        }
+    }
+    return out
+}
+
+fun main() {
+
+    if (replacedigits("a1c1e1") == "abcdef") {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (replacedigits("a1b2c3d4") == "abbdcfdh") {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (replacedigits("b2b") == "bdb") {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    print(" ")
+    if (replacedigits("a16z") == "abgz") {
+        print("Pass")
+    } else {
+        print("Fail")
+    }
+    println("")
+
+}
diff --git a/challenge-275/roger-bell-west/lua/ch-1.lua b/challenge-275/roger-bell-west/lua/ch-1.lua
new file mode 100755
index 0000000000..456f420de6
--- /dev/null
+++ b/challenge-275/roger-bell-west/lua/ch-1.lua
@@ -0,0 +1,70 @@
+#! /usr/bin/lua
+
+-- bart at https://stackoverflow.com/questions/1426954/split-string-in-lua
+function splits(inputstr, sep)
+   sep=sep or '%s'
+   local t={}
+   for field,s in string.gmatch(inputstr, "([^"..sep.."]*)("..sep.."?)") do
+      table.insert(t,field)
+      if s=="" then
+         return t
+      end
+   end
+end
+
+function split(t)
+   local cl = {}
+   string.gsub(t,
+               "(.)",
+               function(c)
+                  table.insert(cl, c)
+               end
+   )
+   return cl
+end
+
+function brokenkeys(a, k)
+   local out = 0
+   local failset = {}
+   for _, c in ipairs(k) do
+      failset[string.lower(c)] = true
+   end
+   for _, word in ipairs(splits(string.lower(a), " ")) do
+      local wordset = {}
+      for _b, c in ipairs(split(word)) do
+         wordset[c] = true
+      end
+      local intersect = {}
+      for k, v in pairs(failset) do
+         if wordset[k] ~= nil then
+            table.insert(intersect, k)
+         end
+      end
+      if #intersect == 0 then
+         out = out + 1
+      end
+   end
+   return out
+end
+
+if brokenkeys("Perl Weekly Challenge", {"l", "a"}) == 0 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if brokenkeys("Perl and Raku", {"a"}) == 1 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if brokenkeys("Well done Team PWC", {"l", "o"}) == 2 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+
diff --git a/challenge-275/roger-bell-west/lua/ch-2.lua b/challenge-275/roger-bell-west/lua/ch-2.lua
new file mode 100755
index 0000000000..021d1aa368
--- /dev/null
+++ b/challenge-275/roger-bell-west/lua/ch-2.lua
@@ -0,0 +1,63 @@
+#! /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 replacedigits(a)
+   local out = {}
+   local prev = 0
+   for _, c in ipairs(split(a)) do
+      if c >= "0" and c <= "9" then
+         table.insert(out, string.char(prev + c))
+      else
+         prev = string.byte(c)
+         table.insert(out, c)
+      end
+   end
+   return join(out)
+end
+
+if replacedigits("a1c1e1") == "abcdef" then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if replacedigits("a1b2c3d4") == "abbdcfdh" then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if replacedigits("b2b") == "bdb" then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if replacedigits("a16z") == "abgz" then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+
diff --git a/challenge-275/roger-bell-west/perl/ch-1.pl b/challenge-275/roger-bell-west/perl/ch-1.pl
new file mode 100755
index 0000000000..3d94697a39
--- /dev/null
+++ b/challenge-275/roger-bell-west/perl/ch-1.pl
@@ -0,0 +1,24 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+use experimental 'signatures';
+
+use Test::More tests => 3;
+
+is(brokenkeys('Perl Weekly Challenge', ['l', 'a']), 0, 'example 1');
+is(brokenkeys('Perl and Raku', ['a']), 1, 'example 2');
+is(brokenkeys('Well done Team PWC', ['l', 'o']), 2, 'example 3');
+
+sub brokenkeys($a, $k) {
+  my $out = 0;
+  my %failset = map {lc($_) => 1} @{$k};
+  foreach my $word (split ' ', $a) {
+    my %wordset = map {$_ => 1} split '',lc($word);
+    my @intersect = grep {exists $wordset{$_}} keys %failset;
+    if (scalar @intersect == 0) {
+      $out++;
+    }
+  }
+  return $out;
+}
diff --git a/challenge-275/roger-bell-west/perl/ch-2.pl b/challenge-275/roger-bell-west/perl/ch-2.pl
new file mode 100755
index 0000000000..8b2e458e23
--- /dev/null
+++ b/challenge-275/roger-bell-west/perl/ch-2.pl
@@ -0,0 +1,26 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+use experimental 'signatures';
+
+use Test::More tests => 4;
+
+is(replacedigits('a1c1e1'), 'abcdef', 'example 1');
+is(replacedigits('a1b2c3d4'), 'abbdcfdh', 'example 2');
+is(replacedigits('b2b'), 'bdb', 'example 3');
+is(replacedigits('a16z'), 'abgz', 'example 4');
+
+sub replacedigits($a) {
+  my @out;
+  my $prev = 0;
+  foreach my $c (split '', $a) {
+    if ($c ge '0' && $c le '9') {
+      push @out, chr($prev + $c);
+    } else {
+      $prev = ord($c);
+      push @out, $c;
+    }
+  }
+  return join('', @out);
+}
diff --git a/challenge-275/roger-bell-west/postscript/ch-1.ps b/challenge-275/roger-bell-west/postscript/ch-1.ps
new file mode 100644
index 0000000000..f8a2e44f93
--- /dev/null
+++ b/challenge-275/roger-bell-west/postscript/ch-1.ps
@@ -0,0 +1,152 @@
+%!PS
+
+% begin included library code
+% see https://codeberg.org/Firedrake/postscript-libraries/
+/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
+
+/keys { % dict -> array of dict keys
+    [ exch
+      {
+          pop
+      } forall
+    ]
+} 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
+
+/a2s {
+    2 dict begin
+    /i exch def
+    i length dup string /o exch def
+    1 sub 0 exch 1 exch {
+        dup i 3 -1 roll get o 3 1 roll put
+    } for
+    o
+    end
+} bind def
+
+/test.start {
+    print (:) print
+    /test.pass 0 def
+    /test.count 0 def
+} bind def
+
+/tolower {
+    s2a
+    [ exch
+      {
+          dup dup 65 ge exch 90 le and {
+              32 add
+          } if
+      } forall
+    ] a2s
+} bind def
+
+/toset { % array -> dict of (value, true)
+    << exch
+       {
+           true
+       } forall
+    >>
+} bind def
+
+/set.intersection {
+    4 dict begin
+    /s 0 dict def
+    /b exch def
+    /a exch def
+    a keys {
+        /k exch def
+        b k known {
+            s k true put
+        } if
+    } forall
+    s
+    end
+} bind def
+
+/s2a {
+    [ exch { } forall ]
+} bind def
+
+
+/map { % array proc -> array
+    2 dict begin
+    /p exch def
+    [ exch
+      {
+          p
+      } forall
+    ]
+    end
+} bind def
+
+
+% end included library code
+
+/brokenkeys {
+    0 dict begin
+    { tolower s2a 0 get } map toset /failset exch def
+    0 exch
+    tolower
+    ( ) strsplit {
+        s2a toset /wordset exch def
+        failset wordset set.intersection length 0 eq {
+            1 add
+        } if
+    } forall
+    end
+} bind def
+
+(brokenkeys) test.start
+(Perl Weekly Challenge) [(l) (a)] brokenkeys 0 eq test
+(Perl and Raku) [(a)] brokenkeys 1 eq test
+(Well done Team PWC) [(l) (o)] brokenkeys 2 eq test
+test.end
diff --git a/challenge-275/roger-bell-west/postscript/ch-2.ps b/challenge-275/roger-bell-west/postscript/ch-2.ps
new file mode 100644
index 0000000000..ecfd8b9846
--- /dev/null
+++ b/challenge-275/roger-bell-west/postscript/ch-2.ps
@@ -0,0 +1,77 @@
+%!PS
+
+% begin included library code
+% see https://codeberg.org/Firedrake/postscript-libraries/
+/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
+
+/s2a {
+    [ exch { } forall ]
+} bind def
+
+/a2s {
+    2 dict begin
+    /i exch def
+    i length dup string /o exch def
+    1 sub 0 exch 1 exch {
+        dup i 3 -1 roll get o 3 1 roll put
+    } for
+    o
+    end
+} 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
+
+/test.start {
+    print (:) print
+    /test.pass 0 def
+    /test.count 0 def
+} bind def
+
+
+% end included library code
+
+/replacedigits {
+    0 dict begin
+    /prev 0 def
+    [ exch
+      s2a {
+          /c exch def
+          c 48 ge c 57 le and {
+              c 48 sub prev add
+          } {
+              /prev c def
+              c
+          } ifelse
+    } forall
+    ]
+    a2s
+    end
+} bind def
+
+(replacedigits) test.start
+(a1c1e1) replacedigits (abcdef) eq test
+(a1b2c3d4) replacedigits (abbdcfdh) eq test
+(b2b) replacedigits (bdb) eq test
+(a16z) replacedigits (abgz) eq test
+test.end
diff --git a/challenge-275/roger-bell-west/python/ch-1.py b/challenge-275/roger-bell-west/python/ch-1.py
new file mode 100755
index 0000000000..0ad687feea
--- /dev/null
+++ b/challenge-275/roger-bell-west/python/ch-1.py
@@ -0,0 +1,25 @@
+#! /usr/bin/python3
+
+def brokenkeys(a, k):
+  out = 0
+  failset = set(c.lower() for c in k)
+  for word in a.lower().split(" "):
+    wordset = set(word)
+    if len(failset.intersection(wordset)) == 0:
+      out += 1
+  return out
+
+import unittest
+
+class TestBrokenkeys(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(brokenkeys("Perl Weekly Challenge", ["l", "a"]), 0, 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(brokenkeys("Perl and Raku", ["a"]), 1, 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(brokenkeys("Well done Team PWC", ["l", "o"]), 2, 'example 3')
+
+unittest.main()
diff --git a/challenge-275/roger-bell-west/python/ch-2.py b/challenge-275/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..fe1a9c1eee
--- /dev/null
+++ b/challenge-275/roger-bell-west/python/ch-2.py
@@ -0,0 +1,32 @@
+#! /usr/bin/python3
+
+def replacedigits(a):
+  out = ""
+  prev = 0
+  digits = {chr(asc) for asc in list(range(ord('0'), ord('9')+1))}
+  for c in a:
+    if c >= '0' and c <= '9':
+      out += chr(prev + int(c))
+    else:
+      prev = ord(c)
+      out += c
+  return out
+    
+
+import unittest
+
+class TestReplacedigits(unittest.TestCase):
+
+  def test_ex1(self):
+    self.assertEqual(replacedigits("a1c1e1"), "abcdef", 'example 1')
+
+  def test_ex2(self):
+    self.assertEqual(replacedigits("a1b2c3d4"), "abbdcfdh", 'example 2')
+
+  def test_ex3(self):
+    self.assertEqual(replacedigits("b2b"), "bdb", 'example 3')
+
+  def test_ex4(self):
+    self.assertEqual(replacedigits("a16z"), "abgz", 'example 4')
+
+unittest.main()
diff --git a/challenge-275/roger-bell-west/raku/ch-1.p6 b/challenge-275/roger-bell-west/raku/ch-1.p6
new file mode 100755
index 0000000000..57ca12d0d0
--- /dev/null
+++ b/challenge-275/roger-bell-west/raku/ch-1.p6
@@ -0,0 +1,21 @@
+#! /usr/bin/raku
+
+use Test;
+
+plan 3;
+
+is(brokenkeys('Perl Weekly Challenge', ['l', 'a']), 0, 'example 1');
+is(brokenkeys('Perl and Raku', ['a']), 1, 'example 2');
+is(brokenkeys('Well done Team PWC', ['l', 'o']), 2, 'example 3');
+
+sub brokenkeys($a, @k) {
+    my $out = 0;
+    my %failset = Set(@k.map({$_.lc}));
+    for $a.split(" ") -> $word {
+        my %wordset = Set($word.lc.comb);
+        if ((%wordset (&) %failset).elems == 0) {
+            $out++;
+        }
+    }
+    return $out;
+}
diff --git a/challenge-275/roger-bell-west/raku/ch-2.p6 b/challenge-275/roger-bell-west/raku/ch-2.p6
new file mode 100755
index 0000000000..cccabd6226
--- /dev/null
+++ b/challenge-275/roger-bell-west/raku/ch-2.p6
@@ -0,0 +1,24 @@
+#! /usr/bin/raku
+
+use Test;
+
+plan 4;
+
+is(replacedigits('a1c1e1'), 'abcdef', 'example 1');
+is(replacedigits('a1b2c3d4'), 'abbdcfdh', 'example 2');
+is(replacedigits('b2b'), 'bdb', 'example 3');
+is(replacedigits('a16z'), 'abgz', 'example 4');
+
+sub replacedigits($a) {
+  my @out;
+  my $prev = 0;
+  for $a.comb -> $c {
+    if ($c ge '0' && $c le '9') {
+      @out.push(chr($prev + $c));
+    } else {
+      $prev = ord($c);
+      @out.push($c);
+    }
+  }
+  return @out.join('');
+}
diff --git a/challenge-275/roger-bell-west/ruby/ch-1.rb b/challenge-275/roger-bell-west/ruby/ch-1.rb
new file mode 100755
index 0000000000..59ae2e5c1f
--- /dev/null
+++ b/challenge-275/roger-bell-west/ruby/ch-1.rb
@@ -0,0 +1,33 @@
+#! /usr/bin/ruby
+
+require 'set'
+
+def brokenkeys(a, k)
+  out = 0
+  failset = Set.new(k.map{ |c| c.downcase })
+  a.split(" ").each do |word|
+    wordset = Set.new(word.downcase.split(""))
+    if (wordset & failset).size == 0
+      out += 1
+    end
+  end
+  out
+end
+
+require 'test/unit'
+
+class TestBrokenkeys < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal(0, brokenkeys('Perl Weekly Challenge', ['l', 'a']))
+  end
+
+  def test_ex2
+    assert_equal(1, brokenkeys('Perl and Raku', ['a']))
+  end
+
+  def test_ex3
+    assert_equal(2, brokenkeys('Well done Team PWC', ['l', 'o']))
+  end
+
+end
diff --git a/challenge-275/roger-bell-west/ruby/ch-2.rb b/challenge-275/roger-bell-west/ruby/ch-2.rb
new file mode 100755
index 0000000000..8faa561bff
--- /dev/null
+++ b/challenge-275/roger-bell-west/ruby/ch-2.rb
@@ -0,0 +1,38 @@
+#! /usr/bin/ruby
+
+def replacedigits(a)
+  out = ""
+  prev = 0
+  a.chars.each do |c|
+    out += case c
+           when '0'..'9'
+             (prev + c.to_i).chr
+           else
+             prev = c.ord
+             c
+           end
+  end
+  out
+end
+
+require 'test/unit'
+
+class TestReplacedigits < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal('abcdef', replacedigits('a1c1e1'))
+  end
+
+  def test_ex2
+    assert_equal('abbdcfdh', replacedigits('a1b2c3d4'))
+  end
+
+  def test_ex3
+    assert_equal('bdb', replacedigits('b2b'))
+  end
+
+  def test_ex4
+    assert_equal('abgz', replacedigits('a16z'))
+  end
+
+end
diff --git a/challenge-275/roger-bell-west/rust/ch-1.rs b/challenge-275/roger-bell-west/rust/ch-1.rs
new file mode 100755
index 0000000000..8c8d634f50
--- /dev/null
+++ b/challenge-275/roger-bell-west/rust/ch-1.rs
@@ -0,0 +1,38 @@
+#! /bin/sh
+//usr/bin/env rustc --test $0 -o ${0}x && ./${0}x --nocapture; rm -f ${0}x ; exit
+
+use std::collections::HashSet;
+
+#[test]
+fn test_ex1() {
+    assert_eq!(brokenkeys("Perl Weekly Challenge", vec!['l', 'a']), 0);
+}
+
+#[test]
+fn test_ex2() {
+    assert_eq!(brokenkeys("Perl and Raku", vec!['a']), 1);
+}
+
+#[test]
+fn test_ex3() {
+    assert_eq!(brokenkeys("Well done Team PWC", vec!['l', 'o']), 2);
+}
+
+#[test]
+fn test_ex4() {
+    assert_eq!(brokenkeys("The joys of polyglottism", vec!['T']), 2);
+}
+
+fn brokenkeys(a: &str, k: Vec<char>) -> u32 {
+    let mut out = 0;
+    let failset =
+        k.iter().map(|c| c.to_ascii_lowercase()).collect::<HashSet<char>>();
+    for word in a.split(' ') {
+        let wordset =
+            word.to_ascii_lowercase().chars().collect::<HashSet<char>>();
+        if wordset.intersection(&failset).count() == 0 {
+            out += 1;
+        }
+    }
+    out
+}
diff --git a/challenge-275/roger-bell-west/rust/ch-2.rs b/challenge-275/roger-bell-west/rust/ch-2.rs
new file mode 100755
index 0000000000..7c2ea4f33c
--- /dev/null
+++ b/challenge-275/roger-bell-west/rust/ch-2.rs
@@ -0,0 +1,39 @@
+#! /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!(replacedigits("a1c1e1"), "abcdef");
+}
+
+#[test]
+fn test_ex2() {
+    assert_eq!(replacedigits("a1b2c3d4"), "abbdcfdh");
+}
+
+#[test]
+fn test_ex3() {
+    assert_eq!(replacedigits("b2b"), "bdb");
+}
+
+#[test]
+fn test_ex4() {
+    assert_eq!(replacedigits("a16z"), "abgz");
+}
+
+fn replacedigits(a: &str) -> String {
+    let mut out = String::new();
+    let mut prev = 0;
+    for c in a.chars() {
+        out.push(match c {
+            '0'..='9' => {
+                char::from_u32(prev + c.to_digit(10).unwrap()).unwrap()
+            }
+            _ => {
+                prev = c as u32;
+                c
+            }
+        });
+    }
+    out
+}
diff --git a/challenge-275/roger-bell-west/scala/ch-1.scala b/challenge-275/roger-bell-west/scala/ch-1.scala
new file mode 100644
index 0000000000..b70aaecb8c
--- /dev/null
+++ b/challenge-275/roger-bell-west/scala/ch-1.scala
@@ -0,0 +1,36 @@
+
+object Brokenkeys {
+  def brokenkeys(a: String, k: List[Char]): Int = {
+    var out = 0
+    val failset: Set[Char] = k.map(c => c.toLower).toSet
+    for (word <- a.split(" ")) {
+      val wordset: Set[Char] = word.toLowerCase().toSet
+      if ((failset & wordset).size == 0) {
+        out += 1
+      }
+    }
+    return out
+  }
+
+  def main(args: Array[String]) {
+    if (brokenkeys("Perl Weekly Challenge", List('l', 'a')) == 0) {
+      print("Pass")
+    } else {
+      print("Fail")
+    }