From e534fc299f1ec99db82b84248e69f58dd8c5b79b Mon Sep 17 00:00:00 2001
From: Roger Bell_West <roger@firedrake.org>
Date: Mon, 23 Nov 2020 14:48:14 +0000
Subject: Solutions for challenge #88.

---
 challenge-088/roger-bell-west/perl/ch-1.pl   |  18 +++++
 challenge-088/roger-bell-west/perl/ch-2.pl   |  52 ++++++++++++++
 challenge-088/roger-bell-west/python/ch-1.py |  20 ++++++
 challenge-088/roger-bell-west/python/ch-2.py |  58 +++++++++++++++
 challenge-088/roger-bell-west/raku/ch-1.p6   |  13 ++++
 challenge-088/roger-bell-west/raku/ch-2.p6   |  50 +++++++++++++
 challenge-088/roger-bell-west/ruby/ch-1.rb   |  20 ++++++
 challenge-088/roger-bell-west/ruby/ch-2.rb   |  68 ++++++++++++++++++
 challenge-088/roger-bell-west/rust/ch-1.rs   |  17 +++++
 challenge-088/roger-bell-west/rust/ch-2.rs   | 101 +++++++++++++++++++++++++++
 10 files changed, 417 insertions(+)
 create mode 100755 challenge-088/roger-bell-west/perl/ch-1.pl
 create mode 100755 challenge-088/roger-bell-west/perl/ch-2.pl
 create mode 100755 challenge-088/roger-bell-west/python/ch-1.py
 create mode 100755 challenge-088/roger-bell-west/python/ch-2.py
 create mode 100755 challenge-088/roger-bell-west/raku/ch-1.p6
 create mode 100755 challenge-088/roger-bell-west/raku/ch-2.p6
 create mode 100755 challenge-088/roger-bell-west/ruby/ch-1.rb
 create mode 100755 challenge-088/roger-bell-west/ruby/ch-2.rb
 create mode 100755 challenge-088/roger-bell-west/rust/ch-1.rs
 create mode 100755 challenge-088/roger-bell-west/rust/ch-2.rs

diff --git a/challenge-088/roger-bell-west/perl/ch-1.pl b/challenge-088/roger-bell-west/perl/ch-1.pl
new file mode 100755
index 0000000000..7de1c765d2
--- /dev/null
+++ b/challenge-088/roger-bell-west/perl/ch-1.pl
@@ -0,0 +1,18 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 2;
+
+is_deeply(aop([5, 2, 1, 4, 3]),[24, 60, 120, 30, 40],'example 1');
+is_deeply(aop([2, 1, 4, 3]),[12, 24, 6, 8],'example 2');
+
+use List::Util qw(product);
+use integer;
+
+sub aop {
+  my $ns=shift;
+  my $p=product(@{$ns});
+  return [map {$p/$_} @{$ns}];
+}
diff --git a/challenge-088/roger-bell-west/perl/ch-2.pl b/challenge-088/roger-bell-west/perl/ch-2.pl
new file mode 100755
index 0000000000..9269ee56e6
--- /dev/null
+++ b/challenge-088/roger-bell-west/perl/ch-2.pl
@@ -0,0 +1,52 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 2;
+
+is_deeply(sm([
+  [ 1, 2, 3 ],
+  [ 4, 5, 6 ],
+  [ 7, 8, 9 ],
+    ]),[1, 2, 3, 6, 9, 8, 7, 4, 5],'example 1');
+is_deeply(sm([
+  [  1,  2,  3,  4 ],
+  [  5,  6,  7,  8 ],
+  [  9, 10, 11, 12 ],
+  [ 13, 14, 15, 16 ],
+    ]),[1, 2, 3, 4, 8, 12, 16, 15, 14, 13, 9, 5, 6, 7, 11, 10],'example 2');
+
+sub sm {
+  my $m=shift;
+  my $mx=scalar @{$m};
+  my $my=scalar @{$m->[0]};
+  my @o=($m->[0][0]);
+  my @v;
+  foreach (1..$mx) {
+    push @v,[(0) x $my];
+  }
+  my @dir=(
+    [0,1],
+    [1,0],
+    [0,-1],
+    [-1,0],
+      );
+  my ($x,$y,$d)=(0,0,0);
+  foreach (2..$mx*$my) {
+    $v[$x][$y]=1;
+    my ($nx,$ny);
+    while (1) {
+      ($nx,$ny)=($x+$dir[$d][0],$y+$dir[$d][1]);
+      if ($nx<0 || $nx>=$mx || $ny<0 || $ny>=$my || $v[$nx][$ny]==1) {
+        $d++;
+        $d%=4;
+      } else {
+        last;
+      }
+    }
+    ($x,$y)=($nx,$ny);
+    push @o,$m->[$x][$y];
+  }
+  return \@o;
+}
diff --git a/challenge-088/roger-bell-west/python/ch-1.py b/challenge-088/roger-bell-west/python/ch-1.py
new file mode 100755
index 0000000000..a6e5a3f2f3
--- /dev/null
+++ b/challenge-088/roger-bell-west/python/ch-1.py
@@ -0,0 +1,20 @@
+#! /usr/bin/python3
+
+from functools import reduce
+import operator
+
+def aop(ns):
+    p=reduce(operator.mul,ns)
+    return [p // i for i in ns]
+
+import unittest;
+
+class TestAop(unittest.TestCase):
+
+    def test_ex1(self):
+        self.assertEqual(aop((5, 2, 1, 4, 3)),[24, 60, 120, 30, 40],'example 1')
+
+    def test_ex2(self):
+        self.assertEqual(aop((2, 1, 4, 3)),[12, 24, 6, 8],'example 2')
+
+unittest.main()
diff --git a/challenge-088/roger-bell-west/python/ch-2.py b/challenge-088/roger-bell-west/python/ch-2.py
new file mode 100755
index 0000000000..33f1906b17
--- /dev/null
+++ b/challenge-088/roger-bell-west/python/ch-2.py
@@ -0,0 +1,58 @@
+#! /usr/bin/python3
+
+def sm(m):
+    mx=len(m)
+    my=len(m[0])
+    o=[m[0][0]]
+    v=list()
+    for i in range(mx):
+        v.append([False] * my)
+    dir=[
+        [0,1],
+        [1,0],
+        [0,-1],
+        [-1,0]
+      ]
+    x=0
+    y=0
+    d=0
+    for i in range(mx*my-1):
+        v[x][y]=True
+        nx=int()
+        ny=int()
+        while (1):
+            nx=x+dir[d][0]
+            ny=y+dir[d][1]
+            if (nx < 0 or
+                nx >= mx or
+                ny < 0 or
+                ny >= my or
+                v[nx][ny] == True):
+                d=(d+1)%4
+            else:
+                break
+        x=nx
+        y=ny
+        o.append(m[x][y])
+    return o
+
+import unittest;
+
+class TestSm(unittest.TestCase):
+
+    def test_ex1(self):
+        self.assertEqual(sm((
+            [ 1, 2, 3 ],
+            [ 4, 5, 6 ],
+            [ 7, 8, 9 ]
+        )),[1, 2, 3, 6, 9, 8, 7, 4, 5],'example 1')
+
+    def test_ex2(self):
+        self.assertEqual(sm((
+            [  1,  2,  3,  4 ],
+            [  5,  6,  7,  8 ],
+            [  9, 10, 11, 12 ],
+            [ 13, 14, 15, 16 ]
+        )),[1, 2, 3, 4, 8, 12, 16, 15, 14, 13, 9, 5, 6, 7, 11, 10],'example 2')
+
+unittest.main()
diff --git a/challenge-088/roger-bell-west/raku/ch-1.p6 b/challenge-088/roger-bell-west/raku/ch-1.p6
new file mode 100755
index 0000000000..13f3ee0334
--- /dev/null
+++ b/challenge-088/roger-bell-west/raku/ch-1.p6
@@ -0,0 +1,13 @@
+#! /usr/bin/perl6
+
+use Test;
+
+plan 2;
+
+is-deeply(aop((5, 2, 1, 4, 3)),(24, 60, 120, 30, 40),'example 1');
+is-deeply(aop((2, 1, 4, 3)),(12, 24, 6, 8),'example 2');
+
+sub aop(@ns) {
+  my $p=@ns.reduce: &infix:<*>;
+  return (map {$p div $_}, @ns);
+}
diff --git a/challenge-088/roger-bell-west/raku/ch-2.p6 b/challenge-088/roger-bell-west/raku/ch-2.p6
new file mode 100755
index 0000000000..c0faba827a
--- /dev/null
+++ b/challenge-088/roger-bell-west/raku/ch-2.p6
@@ -0,0 +1,50 @@
+#! /usr/bin/perl6
+
+use Test;
+
+plan 2;
+
+is-deeply(sm((
+  [ 1, 2, 3 ],
+  [ 4, 5, 6 ],
+  [ 7, 8, 9 ],
+    )),(1, 2, 3, 6, 9, 8, 7, 4, 5),'example 1');
+is-deeply(sm((
+  [  1,  2,  3,  4 ],
+  [  5,  6,  7,  8 ],
+  [  9, 10, 11, 12 ],
+  [ 13, 14, 15, 16 ],
+    )),(1, 2, 3, 4, 8, 12, 16, 15, 14, 13, 9, 5, 6, 7, 11, 10),'example 2');
+
+sub sm(@m) {
+  my $mx=@m.elems;
+  my $my=@m[0].elems;
+  my @o=(@m[0][0]);
+  my @v;
+  for 1..$mx {
+    push @v,[(0) xx $my];
+  }
+  my @dir=(
+    [0,1],
+    [1,0],
+    [0,-1],
+    [-1,0],
+      );
+  my ($x,$y,$d)=(0,0,0);
+  for 2..$mx*$my {
+    @v[$x][$y]=1;
+    my ($nx,$ny);
+    while (1) {
+      ($nx,$ny)=($x+@dir[$d][0],$y+@dir[$d][1]);
+      if ($nx < 0 || $nx >= $mx || $ny < 0 || $ny >= $my || @v[$nx][$ny]==1) {
+        $d++;
+        $d%=4;
+      } else {
+        last;
+      }
+    }
+    ($x,$y)=($nx,$ny);
+    push @o,@m[$x][$y];
+  }
+  return @o.List;
+}
diff --git a/challenge-088/roger-bell-west/ruby/ch-1.rb b/challenge-088/roger-bell-west/ruby/ch-1.rb
new file mode 100755
index 0000000000..9f1c4bf44c
--- /dev/null
+++ b/challenge-088/roger-bell-west/ruby/ch-1.rb
@@ -0,0 +1,20 @@
+#! /usr/bin/ruby
+
+def aop(*ns)
+  p=ns.reduce(:*)
+  return ns.map {|x| p.div(x)}
+end
+
+require 'test/unit'
+
+class TestAop < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal([24, 60, 120, 30, 40],aop(5, 2, 1, 4, 3))
+  end
+
+  def test_ex2
+    assert_equal([12, 24, 6, 8],aop(2, 1, 4, 3))
+  end
+
+end
diff --git a/challenge-088/roger-bell-west/ruby/ch-2.rb b/challenge-088/roger-bell-west/ruby/ch-2.rb
new file mode 100755
index 0000000000..7dfcec29e6
--- /dev/null
+++ b/challenge-088/roger-bell-west/ruby/ch-2.rb
@@ -0,0 +1,68 @@
+#! /usr/bin/ruby
+
+def sm(*m)
+  mx=m.length
+  my=m[0].length
+  o=[m[0][0]]
+  v=Array.new;
+  1.upto(mx) do
+    v.push([false] * my)
+  end
+  dir=[
+    [0,1],
+    [1,0],
+    [0,-1],
+    [-1,0]
+  ]
+  x=0
+  y=0
+  d=0
+  2.upto(mx*my) do
+    v[x][y]=true
+    nx=0
+    ny=0
+    while (true) do
+      nx=x+dir[d][0]
+      ny=y+dir[d][1]
+      if (nx < 0 or nx >= mx or ny < 0 or ny >= my or v[nx][ny]==true)
+        d=(d+1)%4
+      else
+        break
+      end
+    end
+    x=nx
+    y=ny
+    o.push(m[x][y])
+  end
+  return o
+end
+
+
+require 'test/unit'
+
+class TestSm < Test::Unit::TestCase
+
+  def test_ex1
+    assert_equal(
+      [1, 2, 3, 6, 9, 8, 7, 4, 5],
+      sm(
+  [ 1, 2, 3 ],
+  [ 4, 5, 6 ],
+  [ 7, 8, 9 ]
+      ),
+    )
+  end
+
+  def test_ex2
+    assert_equal(
+      [1, 2, 3, 4, 8, 12, 16, 15, 14, 13, 9, 5, 6, 7, 11, 10],
+      sm(
+  [  1,  2,  3,  4 ],
+  [  5,  6,  7,  8 ],
+  [  9, 10, 11, 12 ],
+  [ 13, 14, 15, 16 ]
+      ),
+    )
+  end
+
+end
diff --git a/challenge-088/roger-bell-west/rust/ch-1.rs b/challenge-088/roger-bell-west/rust/ch-1.rs
new file mode 100755
index 0000000000..9adadfd570
--- /dev/null
+++ b/challenge-088/roger-bell-west/rust/ch-1.rs
@@ -0,0 +1,17 @@
+#! /bin/sh
+//usr/bin/env rustc --test $0 -o ${0}x && ./${0}x; rm -f ${0}x ; exit
+
+#[test]
+fn test_ex1() {
+    assert_eq!(aop(vec![5, 2, 1, 4, 3]),vec![24, 60, 120, 30, 40]);
+}
+
+#[test]
+fn test_ex2() {
+    assert_eq!(aop(vec![2, 1, 4, 3],),vec![12, 24, 6, 8]);
+}
+
+fn aop(ns: Vec<i32>) -> Vec<i32> {
+    let p=ns.iter().fold(1,|sum, item| sum * item);
+    return ns.iter().map(|i| p/i).collect()
+}
diff --git a/challenge-088/roger-bell-west/rust/ch-2.rs b/challenge-088/roger-bell-west/rust/ch-2.rs
new file mode 100755
index 0000000000..063f60bc14
--- /dev/null
+++ b/challenge-088/roger-bell-west/rust/ch-2.rs
@@ -0,0 +1,101 @@
+#! /bin/sh
+//usr/bin/env rustc --test $0 -o ${0}x && ./${0}x; rm -f ${0}x ; exit
+
+use std::convert::TryInto;
+
+#[test]
+fn test_ex1() {
+    assert_eq!(sm(vec![
+  vec![ 1, 2, 3 ],
+  vec![ 4, 5, 6 ],
+  vec![ 7, 8, 9 ]
+    ]),vec![1, 2, 3, 6, 9, 8, 7, 4, 5]);
+}
+
+#[test]
+fn test_ex2() {
+    assert_eq!(sm(vec![
+  vec![  1,  2,  3,  4 ],
+  vec![  5,  6,  7,  8 ],
+  vec![  9, 10, 11, 12 ],
+  vec![ 13, 14, 15, 16 ],
+    ],),vec![1, 2, 3, 4, 8, 12, 16, 15, 14, 13, 9, 5, 6, 7, 11, 10]);
+}
+
+fn sm(m: Vec<Vec<i32>>) -> Vec<i32> {
+    let mx=m.len() as usize;
+    let my: usize=m[0].len();
+    let mut o=Vec::<i32>::with_capacity((mx*my).try_into().unwrap());
+    o.push(m[0][0]);
+    let mut v=vec![vec![false; my]; mx];
+    let dir=vec![
+        vec![0,1],
+        vec![1,0],
+        vec![0,-1],
+        vec![-1,0]
+    ];
+    let mut x :usize=0;
+    let mut y :usize=0;
+    let mut d :usize=0;
+    for _i in 1..mx*my {
+        v[x][y]=true;
+        let mut nx: isize;
+        let mut ny: isize;
+        loop {
+            nx=(x as isize)+dir[d][0];
+            ny=(y as isize)+dir[d][1];
+            let mut ex=false;
+            if nx < 0 || nx as usize >= mx ||
+                ny < 0 || ny as usize >= my {
+                    ex=true;
+                }
+            if ex==false {
+                if v[nx as usize][ny as usize]==true {
+                    ex=true;
+                }
+            }
+            if ex {
+                d=(d+1)%4;
+            } else {
+                break;
+            }
+        }
+        x=nx.try_into().unwrap();
+        y=ny.try_into().unwrap();
+        o.push(m[x][y]);
+    }
+    return o
+}
+
+//sub sm(@m) {
+//  my $mx=@m.elems;
+//  my $my=@m[0].elems;
+//  my @o=(@m[0][0]);
+//  my @v;
+//  for 1..$mx {
+//    push @v,[(0) xx $my];
+//  }
+//  my @dir=(
+//    [0,1],
+//    [1,0],
+//    [0,-1],
+//    [-1,0],
+//      );
+//  my ($x,$y,$d)=(0,0,0);
+//  for 2..$mx*$my {
+//    @v[$x][$y]=1;
+//    my ($nx,$ny);
+//    while (1) {
+//      ($nx,$ny)=($x+@dir[$d][0],$y+@dir[$d][1]);
+//      if ($nx < 0 || $nx >= $mx || $ny < 0 || $ny >= $my || @v[$nx][$ny]==1) {
+//        $d++;
+//        $d%=4;
+//      } else {
+//        last;
+//      }
+//    }
+//    ($x,$y)=($nx,$ny);
+//    push @o,@m[$x][$y];
+//  }
+//  return @o.List;
+//}
-- 
cgit 


From df716b4b4e9af980f6cd5d267a16eaa9716f03af Mon Sep 17 00:00:00 2001
From: Roger Bell_West <roger@firedrake.org>
Date: Mon, 23 Nov 2020 14:53:10 +0000
Subject: remove spurious comments

---
 challenge-088/roger-bell-west/rust/ch-2.rs | 33 ------------------------------
 1 file changed, 33 deletions(-)

diff --git a/challenge-088/roger-bell-west/rust/ch-2.rs b/challenge-088/roger-bell-west/rust/ch-2.rs
index 063f60bc14..01f91c0a98 100755
--- a/challenge-088/roger-bell-west/rust/ch-2.rs
+++ b/challenge-088/roger-bell-west/rust/ch-2.rs
@@ -66,36 +66,3 @@ fn sm(m: Vec<Vec<i32>>) -> Vec<i32> {
     }
     return o
 }
-
-//sub sm(@m) {
-//  my $mx=@m.elems;
-//  my $my=@m[0].elems;
-//  my @o=(@m[0][0]);
-//  my @v;
-//  for 1..$mx {
-//    push @v,[(0) xx $my];
-//  }
-//  my @dir=(
-//    [0,1],
-//    [1,0],
-//    [0,-1],
-//    [-1,0],
-//      );
-//  my ($x,$y,$d)=(0,0,0);
-//  for 2..$mx*$my {
-//    @v[$x][$y]=1;
-//    my ($nx,$ny);
-//    while (1) {
-//      ($nx,$ny)=($x+@dir[$d][0],$y+@dir[$d][1]);
-//      if ($nx < 0 || $nx >= $mx || $ny < 0 || $ny >= $my || @v[$nx][$ny]==1) {
-//        $d++;
-//        $d%=4;
-//      } else {
-//        last;
-//      }
-//    }
-//    ($x,$y)=($nx,$ny);
-//    push @o,@m[$x][$y];
-//  }
-//  return @o.List;
-//}
-- 
cgit