From 994cc826d23c6cdd8c55b28a49ecc7dac9c54145 Mon Sep 17 00:00:00 2001
From: Roger Bell_West <roger@firedrake.org>
Date: Tue, 4 Nov 2025 11:48:22 +0000
Subject: RogerBW solutions for challenge no. 346

---
 challenge-346/roger-bell-west/crystal/ch-1.cr    | 49 ++++++++++++
 challenge-346/roger-bell-west/javascript/ch-1.js | 62 +++++++++++++++
 challenge-346/roger-bell-west/javascript/ch-2.js | 97 ++++++++++++++++++++++++
 challenge-346/roger-bell-west/lua/ch-1.lua       | 77 +++++++++++++++++++
 challenge-346/roger-bell-west/perl/ch-1.pl       | 44 +++++++++++
 challenge-346/roger-bell-west/perl/ch-2.pl       | 48 ++++++++++++
 challenge-346/roger-bell-west/postscript/ch-1.ps | 79 +++++++++++++++++++
 challenge-346/roger-bell-west/ruby/ch-1.rb       | 56 ++++++++++++++
 challenge-346/roger-bell-west/ruby/ch-2.rb       | 66 ++++++++++++++++
 challenge-346/roger-bell-west/rust/ch-1.rs       | 56 ++++++++++++++
 challenge-346/roger-bell-west/scala/ch-1.scala   | 63 +++++++++++++++
 challenge-346/roger-bell-west/tests.json         | 53 +++++++++++++
 challenge-346/roger-bell-west/typst/ch-1.typ     | 51 +++++++++++++
 13 files changed, 801 insertions(+)
 create mode 100755 challenge-346/roger-bell-west/crystal/ch-1.cr
 create mode 100755 challenge-346/roger-bell-west/javascript/ch-1.js
 create mode 100755 challenge-346/roger-bell-west/javascript/ch-2.js
 create mode 100755 challenge-346/roger-bell-west/lua/ch-1.lua
 create mode 100755 challenge-346/roger-bell-west/perl/ch-1.pl
 create mode 100755 challenge-346/roger-bell-west/perl/ch-2.pl
 create mode 100644 challenge-346/roger-bell-west/postscript/ch-1.ps
 create mode 100755 challenge-346/roger-bell-west/ruby/ch-1.rb
 create mode 100755 challenge-346/roger-bell-west/ruby/ch-2.rb
 create mode 100755 challenge-346/roger-bell-west/rust/ch-1.rs
 create mode 100644 challenge-346/roger-bell-west/scala/ch-1.scala
 create mode 100644 challenge-346/roger-bell-west/tests.json
 create mode 100644 challenge-346/roger-bell-west/typst/ch-1.typ

diff --git a/challenge-346/roger-bell-west/crystal/ch-1.cr b/challenge-346/roger-bell-west/crystal/ch-1.cr
new file mode 100755
index 0000000000..85c58abf93
--- /dev/null
+++ b/challenge-346/roger-bell-west/crystal/ch-1.cr
@@ -0,0 +1,49 @@
+#! /usr/bin/crystal
+
+def longestparenthesis(aa)
+  a = aa.chars
+  ml = 0
+  0.upto(a.size - 1) do |l|
+    l.upto(a.size - 1) do |r|
+      depth = 0
+      valid = true
+      l.upto(r) do |i|
+        if a[i] == '('
+          depth += 1
+        else
+          depth -= 1
+          if depth < 0
+            valud = false
+            break
+          end
+        end
+      end
+      if depth != 0
+        valid = false
+      end
+      if valid
+        ml = [ml, r - l + 1].max
+      end
+    end
+  end
+  ml
+end
+
+require "spec"
+describe "longestparenthesis" do
+  it "test_ex1" do
+    longestparenthesis("(()())").should eq 6
+  end
+  it "test_ex2" do
+    longestparenthesis(")()())").should eq 4
+  end
+  it "test_ex3" do
+    longestparenthesis("((()))()(((()").should eq 8
+  end
+  it "test_ex4" do
+    longestparenthesis("))))((()(").should eq 2
+  end
+  it "test_ex5" do
+    longestparenthesis("()(()").should eq 2
+  end
+end
diff --git a/challenge-346/roger-bell-west/javascript/ch-1.js b/challenge-346/roger-bell-west/javascript/ch-1.js
new file mode 100755
index 0000000000..4b01d7710c
--- /dev/null
+++ b/challenge-346/roger-bell-west/javascript/ch-1.js
@@ -0,0 +1,62 @@
+#! /usr/bin/node
+
+"use strict"
+
+function longestparenthesis(aa) {
+    const a = aa.split('');
+    let ml = 0;
+    for (let l = 0 ; l < a.length; l++) {
+        for (let r = l; r < a.length; r++) {
+            let depth = 0;
+            let constid = true;
+            for (let i = l; i <= r; i++) {
+                if (a[i] == '(') {
+                    depth += 1;
+                } else {
+                    depth -= 1;
+                    if (depth < 0) {
+                        constid = false;
+                    }
+                }
+            }
+            if (depth != 0) {
+                constid = false;
+            }
+            if (constid) {
+                ml = Math.max(ml, r - l + 1);
+            }
+        }
+    }
+    return ml;
+}
+
+if (longestparenthesis('(()())') == 6) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (longestparenthesis(')()())') == 4) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (longestparenthesis('((()))()(((()') == 8) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (longestparenthesis('))))((()(') == 2) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (longestparenthesis('()(()') == 2) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write("\n");
diff --git a/challenge-346/roger-bell-west/javascript/ch-2.js b/challenge-346/roger-bell-west/javascript/ch-2.js
new file mode 100755
index 0000000000..1486aee2ab
--- /dev/null
+++ b/challenge-346/roger-bell-west/javascript/ch-2.js
@@ -0,0 +1,97 @@
+#! /usr/bin/node
+
+"use strict"
+
+function magicexpression(number, target) {
+    const n = number.split('');
+    const l = number.length - 1;
+    let counter = new Array(l).fill(0);
+    let out = [];
+    const rx = new RegExp("(^|[^0-9])0[0-9]");
+    LOOP:
+    while (true) {
+        let i = 0;
+        counter[i]++;
+        while (counter[i] == 4) {
+            counter[i] = 0;
+            i++;
+            if (i < l) {
+                counter[i]++;
+            } else {
+                break LOOP;
+            }
+        }
+        let ex = "";
+        for (let i = 0; i < l; i++) {
+            ex += n[i];
+            ex += ["", '+', '-', '*'][counter[i]];
+        }
+        ex += n[l];
+        if (ex.search(rx) != -1) {
+            continue LOOP;
+        }
+        if (eval(ex) == target) {
+            out.push(ex);
+        }
+    }
+    out.sort();
+    return out;
+}
+
+// by Frank Tan
+// https://stackoverflow.com/questions/38400594/javascript-deep-comparison
+function deepEqual(a,b)
+{
+    if( (typeof a == 'object' && a != null) &&
+        (typeof b == 'object' && b != null) )
+    {
+        var count = [0,0];
+        for( var key in a) count[0]++;
+        for( var key in b) count[1]++;
+        if( count[0]-count[1] != 0) {return false;}
+        for( var key in a)
+        {
+            if(!(key in b) || !deepEqual(a[key],b[key])) {return false;}
+        }
+        for( var key in b)
+        {
+            if(!(key in a) || !deepEqual(b[key],a[key])) {return false;}
+        }
+        return true;
+    }
+    else
+    {
+        return a === b;
+    }
+}
+
+if (deepEqual(magicexpression('123', 6), ['1*2*3', '1+2+3'])) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (deepEqual(magicexpression('105', 5), ['1*0+5', '10-5'])) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (deepEqual(magicexpression('232', 8), ['2*3+2', '2+3*2'])) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (deepEqual(magicexpression('1234', 10), ['1*2*3+4', '1+2+3+4'])) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write(" ");
+if (deepEqual(magicexpression('1001', 2), ['1+0*0+1', '1+0+0+1', '1+0-0+1', '1-0*0+1', '1-0+0+1', '1-0-0+1'])) {
+  process.stdout.write("Pass");
+} else {
+  process.stdout.write("FAIL");
+}
+process.stdout.write("\n");
diff --git a/challenge-346/roger-bell-west/lua/ch-1.lua b/challenge-346/roger-bell-west/lua/ch-1.lua
new file mode 100755
index 0000000000..38386eddd9
--- /dev/null
+++ b/challenge-346/roger-bell-west/lua/ch-1.lua
@@ -0,0 +1,77 @@
+#! /usr/bin/lua
+
+function split(t)
+   local cl = {}
+   string.gsub(t,
+               "(.)",
+               function(c)
+                  table.insert(cl, c)
+               end
+   )
+   return cl
+end
+
+function longestparenthesis(aa)
+   local a = split(aa)
+   local ml = 0
+   for l = 1, #a do
+      for r = l, #a do
+         local depth = 0
+         local valid = true
+         for i = l, r do
+            if a[i] == "(" then
+               depth = depth + 1
+            else
+               depth = depth - 1
+               if depth < 0 then
+                  valid = false
+                  break
+               end
+            end
+         end
+         if depth ~= 0 then
+            valid = false
+         end
+         if valid then
+            ml = math.max(ml, r - l + 1)
+         end
+      end
+   end
+   return ml
+end
+
+if longestparenthesis("(()())") == 6 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if longestparenthesis(")()())") == 4 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if longestparenthesis("((()))()(((()") == 8 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if longestparenthesis("))))((()(") == 2 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+io.write(" ")
+
+if longestparenthesis("()(()") == 2 then
+  io.write("Pass")
+else
+  io.write("FAIL")
+end
+print("")
+
diff --git a/challenge-346/roger-bell-west/perl/ch-1.pl b/challenge-346/roger-bell-west/perl/ch-1.pl
new file mode 100755
index 0000000000..38d9e1f2ad
--- /dev/null
+++ b/challenge-346/roger-bell-west/perl/ch-1.pl
@@ -0,0 +1,44 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+use experimental 'signatures';
+
+use Test::More tests => 5;
+
+is(longestparenthesis('(()())'), 6, 'example 1');
+is(longestparenthesis(')()())'), 4, 'example 2');
+is(longestparenthesis('((()))()(((()'), 8, 'example 3');
+is(longestparenthesis('))))((()('), 2, 'example 4');
+is(longestparenthesis('()(()'), 2, 'example 5');
+
+use List::Util qw(max);
+
+sub longestparenthesis($aa) {
+  my @a = split '', $aa;
+  my $ml = 0;
+  foreach my $l (0 .. $#a) {
+    foreach my $r ($l .. $#a) {
+      my $depth = 0;
+      my $valid = 1;
+      foreach my $i ($l .. $r) {
+        if ($a[$i] eq '(') {
+          $depth++;
+        } else {
+          $depth--;
+          if ($depth < 0) {
+            $valid = 0;
+            last;
+          }
+        }
+      }
+      if ($depth != 0) {
+        $valid = 0;
+      }
+      if ($valid) {
+        $ml = max($ml, $r - $l + 1);
+      }
+    }
+  }
+  $ml;
+}
diff --git a/challenge-346/roger-bell-west/perl/ch-2.pl b/challenge-346/roger-bell-west/perl/ch-2.pl
new file mode 100755
index 0000000000..eb3b3c8a58
--- /dev/null
+++ b/challenge-346/roger-bell-west/perl/ch-2.pl
@@ -0,0 +1,48 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+use experimental 'signatures';
+
+use Test::More tests => 5;
+
+is_deeply(magicexpression('123', 6), ['1*2*3', '1+2+3'], 'example 1');
+is_deeply(magicexpression('105', 5), ['1*0+5', '10-5'], 'example 2');
+is_deeply(magicexpression('232', 8), ['2*3+2', '2+3*2'], 'example 3');
+is_deeply(magicexpression('1234', 10), ['1*2*3+4', '1+2+3+4'], 'example 4');
+is_deeply(magicexpression('1001', 2), ['1+0*0+1', '1+0+0+1', '1+0-0+1', '1-0*0+1', '1-0+0+1', '1-0-0+1'], 'example 5');
+
+sub magicexpression($number, $target) {
+  my @n = split '', $number;
+  my $l = length($number) - 1;
+  my @counter = (0) x $l;
+  my @out;
+ LOOP:
+  while (1) {
+    my $i = 0;
+    $counter[$i]++;
+    while ($counter[$i] == 4) {
+      $counter[$i] = 0;
+      $i++;
+      if ($i < $l) {
+        $counter[$i]++;
+      } else {
+        last LOOP;
+      }
+    }
+    my $ex = '';
+    foreach my $i (0 .. $l - 1) {
+      $ex .= $n[$i];
+      $ex .= ['', '+', '-', '*']->[$counter[$i]];
+    }
+    $ex .= $n[$l];
+    if ($ex =~ /(^|\D)0\d/) {
+      next LOOP;
+    }
+    if (eval($ex) == $target) {
+      push @out, $ex;
+    }
+  }
+  @out = sort @out;
+  \@out;
+}
diff --git a/challenge-346/roger-bell-west/postscript/ch-1.ps b/challenge-346/roger-bell-west/postscript/ch-1.ps
new file mode 100644
index 0000000000..30dc0bfc54
--- /dev/null
+++ b/challenge-346/roger-bell-west/postscript/ch-1.ps
@@ -0,0 +1,79 @@
+%!PS
+
+% begin included library code
+% see https://codeberg.org/Firedrake/postscript-libraries/
+/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 {
+    /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.start {
+    print (:) print
+    /test.pass 0 def
+    /test.count 0 def
+} bind def
+
+
+% end included library code
+
+/longestparenthesis {
+    0 dict begin
+    /a exch def
+    /ml 0 def
+    0 1 a length 1 sub {
+        /l exch def
+        l 1 add 1 a length 1 sub {
+            /r exch def
+            /depth 0 def
+            /valid true def
+            l 1 r {
+                /i exch def
+                a i get 40 eq {
+                    /depth depth 1 add def
+                } {
+                    /depth depth 1 sub def
+                    depth 0 lt {
+                        /valid false def
+                        exit
+                    } if
+                } ifelse
+            } for
+            depth 0 ne {
+                /valid false def
+            } if
+            valid {
+                /ml ml r l sub 1 add max def
+            } if
+        } for
+    } for
+    ml
+    end
+} bind def
+
+(longestparenthesis) test.start
+(\(\(\)\(\)\)) longestparenthesis 6 eq test
+(\)\(\)\(\)\)) longestparenthesis 4 eq test
+(\(\(\(\)\)\)\(\)\(\(\(\(\)) longestparenthesis 8 eq test
+(\)\)\)\)\(\(\(\)\() longestparenthesis 2 eq test
+(\(\)\(\(\)) longestparenthesis 2 eq test
+test.end
diff --git a/challenge-346/roger-bell-west/ruby/ch-1.rb b/challenge-346/roger-bell-west/ruby/ch-1.rb
new file mode 100755
index 0000000000..8ff61a5d1f
--- /dev/null
+++ b/challenge-346/roger-bell-west/ruby/ch-1.rb
@@ -0,0 +1,56 @@
+#! /usr/bin/ruby
+
+def longestparenthesis(aa)
+  a = aa.chars
+  ml = 0
+  0.upto(a.size - 1) do |l|
+    l.upto(a.size - 1) do |r|
+      depth = 0
+      valid = true
+      l.upto(r) do |i|
+        if a[i] == '('
+          depth += 1
+        else
+          depth -= 1
+          if depth < 0
+            valud = false
+            break
+          end
+        end
+      end
+      if depth != 0
+        valid = false
+      end
+      if valid
+        ml = [ml, r - l + 1].max
+      end
+    end
+  end
+  ml
+end
+
+require 'test/unit'
+
+class TestLongestparenthesis < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal(6, longestparenthesis('(()())'))
+  end
+
+  def test_ex2
+    assert_equal(4, longestparenthesis(')()())'))
+  end
+
+  def test_ex3
+    assert_equal(8, longestparenthesis('((()))()(((()'))
+  end
+
+  def test_ex4
+    assert_equal(2, longestparenthesis('))))((()('))
+  end
+
+  def test_ex5
+    assert_equal(2, longestparenthesis('()(()'))
+  end
+
+end
diff --git a/challenge-346/roger-bell-west/ruby/ch-2.rb b/challenge-346/roger-bell-west/ruby/ch-2.rb
new file mode 100755
index 0000000000..1e19fb7432
--- /dev/null
+++ b/challenge-346/roger-bell-west/ruby/ch-2.rb
@@ -0,0 +1,66 @@
+#! /usr/bin/ruby
+
+def magicexpression(number, target)
+  n = number.chars
+  l = n.size - 1
+  counter = Array.new(l, 0)
+  out = Array.new
+  loop do
+    i = 0
+    counter[i] += 1
+    brk = false
+    while counter[i] == 4
+      counter[i] = 0
+      i += 1
+      if i < l
+        counter[i] += 1
+      else
+        brk = true
+        break
+      end
+    end
+    if brk
+      break
+    end
+    ex = ""
+    0.upto(l - 1) do |i|
+      ex += n[i]
+      ex += ["", "+", "-", "*"][counter[i]]
+    end
+    ex += n[l]
+    if ex =~ /(^|\D)0\d/
+      next
+    end
+    if eval(ex) == target
+      out.push(ex)
+    end
+  end
+  out.sort!
+  out
+end
+
+require 'test/unit'
+
+class TestMagicexpression < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal(['1*2*3', '1+2+3'], magicexpression('123', 6))
+  end
+
+  def test_ex2
+    assert_equal(['1*0+5', '10-5'], magicexpression('105', 5))
+  end
+
+  def test_ex3
+    assert_equal(['2*3+2', '2+3*2'], magicexpression('232', 8))
+  end
+
+  def test_ex4
+    assert_equal(['1*2*3+4', '1+2+3+4'], magicexpression('1234', 10))
+  end
+
+  def test_ex5
+    assert_equal(['1+0*0+1', '1+0+0+1', '1+0-0+1', '1-0*0+1', '1-0+0+1', '1-0-0+1'], magicexpression('1001', 2))
+  end
+
+end
diff --git a/challenge-346/roger-bell-west/rust/ch-1.rs b/challenge-346/roger-bell-west/rust/ch-1.rs
new file mode 100755
index 0000000000..cebaffa2e4
--- /dev/null
+++ b/challenge-346/roger-bell-west/rust/ch-1.rs
@@ -0,0 +1,56 @@
+#! /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!(longestparenthesis("(()())"), 6);
+}
+
+#[test]
+fn test_ex2() {
+    assert_eq!(longestparenthesis(")()())"), 4);
+}
+
+#[test]
+fn test_ex3() {
+    assert_eq!(longestparenthesis("((()))()(((()"), 8);
+}
+
+#[test]
+fn test_ex4() {
+    assert_eq!(longestparenthesis("))))((()("), 2);
+}
+
+#[test]
+fn test_ex5() {
+    assert_eq!(longestparenthesis("()(()"), 2);
+}
+
+fn longestparenthesis(aa: &str) -> usize {
+    let a = aa.chars().collect::<Vec<char>>();
+    let mut ml = 0;
+    for l in 0 .. a.len() {
+        for r in l .. a.len() {
+            let mut depth = 0i32;
+            let mut valid = true;
+            for i in l ..= r {
+                if a[i] == '(' {
+                    depth += 1;
+                } else {
+                    depth -= 1;
+                    if depth < 0 {
+                        valid = false;
+                        break;
+                    }
+                }
+            }
+            if depth != 0 {
+                valid = false;
+            }
+            if valid {
+                ml = std::cmp::max(ml, r - l + 1);
+            }
+        }
+    }
+    ml
+}
diff --git a/challenge-346/roger-bell-west/scala/ch-1.scala b/challenge-346/roger-bell-west/scala/ch-1.scala
new file mode 100644
index 0000000000..f402c7b997
--- /dev/null
+++ b/challenge-346/roger-bell-west/scala/ch-1.scala
@@ -0,0 +1,63 @@
+
+object Longestparenthesis {
+  def longestparenthesis(aa: String): Int = {
+    val a = aa.toList
+    var ml = 0
+    for (l <- 0 until a.size) {
+      for (r <- l until a.size) {
+        var depth = 0
+        var valid = true
+        for (i <- l to r) {
+          if (a(i) == '(') {
+            depth += 1;
+          } else {
+            depth -= 1
+            if (depth < 0) {
+              valid = false
+            }
+          }
+        }
+        if (depth != 0) {
+          valid = false
+        }
+        if (valid) {
+          ml = List(ml, r - l + 1).max
+        }
+      }
+    }
+    ml
+  }
+  def main(args: Array[String]) {
+    if (longestparenthesis("(()())") == 6) {
+      print("Pass")
+    } else {
+      print("Fail")
+    }
+    print(" ")
+    if (longestparenthesis(")()())") == 4) {
+      print("Pass")
+    } else {
+      print("Fail")
+    }
+    print(" ")
+    if (longestparenthesis("((()))()(((()") == 8) {
+      print("Pass")
+    } else {
+      print("Fail")
+    }
+    print(" ")
+    if (longestparenthesis("))))((()(") == 2) {
+      print("Pass")
+    } else {
+      print("Fail")
+    }
+    print(" ")
+    if (longestparenthesis("()(()") == 2) {
+      print("Pass")
+    } else {
+      print("Fail")
+    }
+    println("")
+
+  }
+}
diff --git a/challenge-346/roger-bell-west/tests.json b/challenge-346/roger-bell-west/tests.json
new file mode 100644
index 0000000000..346a8c66c7
--- /dev/null
+++ b/challenge-346/roger-bell-west/tests.json
@@ -0,0 +1,53 @@
+{
+    "ch-1" : [
+        {
+            "function" : "longestparenthesis",
+            "arguments" : "(()())",
+            "result" : 6
+        },
+        {
+            "arguments" : ")()())",
+            "result" : 4
+        },
+        {
+            "arguments" : "((()))()(((()",
+            "result" : 8
+        },
+        {
+            "arguments" : "))))((()(",
+            "result" : 2
+        },
+        {
+            "arguments" : "()(()",
+            "result" : 2
+        }
+    ],
+    "ch-2" : [
+        {
+            "function" : "magicexpression",
+            "multiarg" : true,
+            "arguments" : [ "123", 6 ],
+            "result" : [ "1*2*3", "1+2+3" ]
+        },
+        {
+            "multiarg" : true,
+            "arguments" : [ "105", 5 ],
+            "result" : [ "1*0+5", "10-5" ]
+        },
+        {
+            "multiarg" : true,
+            "arguments" : [ "232", 8 ],
+            "result" : [ "2*3+2", "2+3*2" ]
+        },
+        {
+            "multiarg" : true,
+            "arguments" : [ "1234", 10 ],
+            "result" : [ "1*2*3+4", "1+2+3+4" ]
+        },
+        {
+            "multiarg" : true,
+            "arguments" : [ "1001", 2 ],
+            "result" : [ "1+0*0+1", "1+0+0+1", "1+0-0+1", "1-0*0+1", "1-0+0+1", "1-0-0+1" ]
+        }
+    ]
+}
diff --git a/challenge-346/roger-bell-west/typst/ch-1.typ b/challenge-346/roger-bell-west/typst/ch-1.typ
new file mode 100644
index 0000000000..7e825f49e1
--- /dev/null
+++ b/challenge-346/roger-bell-west/typst/ch-1.typ
@@ -0,0 +1,51 @@
+#let testresult(pass) = {
+  if pass {
+    text(fill: green, "Pass")
+  } else {
+    text(fill: red, "Fail")
+  }
+}
+
+#let longestparenthesis(a) = {
+  let ml = 0
+  for l in range(a.len()) {
+    for r in range(l, a.len()) {
+      let depth = 0
+      let valid = true
+      for i in range(l, r + 1) {
+        if a.at(i) == "(" {
+          depth += 1
+        } else {
+          depth -= 1
+          if depth < 0 {
+            valid = false
+            break
+          }
+        }
+      }
+      if depth != 0 {
+        valid = false
+      }
+      if valid {
+        ml = calc.max(ml, r - l + 1)
+      }
+    }
+  }
+  ml
+}
+
+Test 1:
+    #testresult(longestparenthesis("(()())") == 6)
+
+Test 2:
+    #testresult(longestparenthesis(")()())") == 4)
+
+Test 3:
+    #testresult(longestparenthesis("((()))()(((()") == 8)
+
+Test 4:
+    #testresult(longestparenthesis("))))((()(") == 2)
+
+Test 5:
+    #testresult(longestparenthesis("()(()") == 2)
+
-- 
cgit