From e8797a0e5b456111b7eedd1a2d4085394d58c3be Mon Sep 17 00:00:00 2001
From: Adam Russell <ac.russell@live.com>
Date: Fri, 4 Dec 2020 00:29:42 -0500
Subject: initial commit

---
 challenge-089/adam-russell/blog.txt      | 0
 challenge-089/adam-russell/cxx/ch-1.cxx  | 0
 challenge-089/adam-russell/cxx/ch-2.cxx  | 0
 challenge-089/adam-russell/perl/ch-1.pl  | 0
 challenge-089/adam-russell/perl/ch-2.pl  | 0
 challenge-089/adam-russell/prolog/ch-1.p | 0
 challenge-089/adam-russell/prolog/ch-2.p | 0
 7 files changed, 0 insertions(+), 0 deletions(-)
 create mode 100644 challenge-089/adam-russell/blog.txt
 create mode 100644 challenge-089/adam-russell/cxx/ch-1.cxx
 create mode 100644 challenge-089/adam-russell/cxx/ch-2.cxx
 create mode 100644 challenge-089/adam-russell/perl/ch-1.pl
 create mode 100644 challenge-089/adam-russell/perl/ch-2.pl
 create mode 100644 challenge-089/adam-russell/prolog/ch-1.p
 create mode 100644 challenge-089/adam-russell/prolog/ch-2.p

diff --git a/challenge-089/adam-russell/blog.txt b/challenge-089/adam-russell/blog.txt
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/challenge-089/adam-russell/cxx/ch-1.cxx b/challenge-089/adam-russell/cxx/ch-1.cxx
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/challenge-089/adam-russell/cxx/ch-2.cxx b/challenge-089/adam-russell/cxx/ch-2.cxx
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/challenge-089/adam-russell/perl/ch-1.pl b/challenge-089/adam-russell/perl/ch-1.pl
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/challenge-089/adam-russell/perl/ch-2.pl b/challenge-089/adam-russell/perl/ch-2.pl
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/challenge-089/adam-russell/prolog/ch-1.p b/challenge-089/adam-russell/prolog/ch-1.p
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/challenge-089/adam-russell/prolog/ch-2.p b/challenge-089/adam-russell/prolog/ch-2.p
new file mode 100644
index 0000000000..e69de29bb2
-- 
cgit 


From 677b5c60fdf816690c1496bfdb0dcbb40aa3f1ce Mon Sep 17 00:00:00 2001
From: Adam Russell <ac.russell@live.com>
Date: Sun, 6 Dec 2020 17:19:16 -0500
Subject: solutions for challenge 089

---
 challenge-089/adam-russell/blog.txt      |  1 +
 challenge-089/adam-russell/blog1.txt     |  1 +
 challenge-089/adam-russell/cxx/ch-1.cxx  |  0
 challenge-089/adam-russell/cxx/ch-2.cxx  |  0
 challenge-089/adam-russell/perl/ch-1.pl  | 46 ++++++++++++++++++++++++++++++++
 challenge-089/adam-russell/perl/ch-2.pl  | 40 +++++++++++++++++++++++++++
 challenge-089/adam-russell/prolog/ch-1.p | 37 +++++++++++++++++++++++++
 challenge-089/adam-russell/prolog/ch-2.p | 43 +++++++++++++++++++++++++++++
 8 files changed, 168 insertions(+)
 create mode 100644 challenge-089/adam-russell/blog1.txt
 delete mode 100644 challenge-089/adam-russell/cxx/ch-1.cxx
 delete mode 100644 challenge-089/adam-russell/cxx/ch-2.cxx

diff --git a/challenge-089/adam-russell/blog.txt b/challenge-089/adam-russell/blog.txt
index e69de29bb2..52441b7561 100644
--- a/challenge-089/adam-russell/blog.txt
+++ b/challenge-089/adam-russell/blog.txt
@@ -0,0 +1 @@
+http://www.rabbitfarm.com/cgi-bin/blosxom/perl/2020/12/06
diff --git a/challenge-089/adam-russell/blog1.txt b/challenge-089/adam-russell/blog1.txt
new file mode 100644
index 0000000000..4b12cf010a
--- /dev/null
+++ b/challenge-089/adam-russell/blog1.txt
@@ -0,0 +1 @@
+http://www.rabbitfarm.com/cgi-bin/blosxom/prolog/2020/12/06
diff --git a/challenge-089/adam-russell/cxx/ch-1.cxx b/challenge-089/adam-russell/cxx/ch-1.cxx
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/challenge-089/adam-russell/cxx/ch-2.cxx b/challenge-089/adam-russell/cxx/ch-2.cxx
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/challenge-089/adam-russell/perl/ch-1.pl b/challenge-089/adam-russell/perl/ch-1.pl
index e69de29bb2..999052ff68 100644
--- a/challenge-089/adam-russell/perl/ch-1.pl
+++ b/challenge-089/adam-russell/perl/ch-1.pl
@@ -0,0 +1,46 @@
+use strict;
+use warnings;
+##
+# You are given a positive integer $N. Write a script to sum GCD of all possible 
+# unique pairs between 1 and $N.
+##
+
+sub all_unique_pairs{
+    my($n) = @_;
+    my %pairs;
+    for my $i (1 .. $n){
+        for my $j (1 .. $n){
+            $pairs{"$i-$j"} = -1 unless $pairs{"$i-$j"} || $pairs{"$j-$i"} || $i == $j; 
+        }
+    }
+    return sort keys %pairs;
+}
+
+sub euclid {
+    my($a, $b) = @_;
+    return ($b) ? euclid($b, $a % $b) : $a;
+}
+
+MAIN:{
+    my $gcd_sum = 0; 
+    my @values =  all_unique_pairs(3);
+    for my $pair (@values[0 .. @values - 2]){
+        my($i, $j) = split(/-/, $pair);
+        $gcd_sum += euclid($i, $j);
+        print "gcd($i, $j) + ";  
+    }
+    my ($i, $j) = split(/-/, $values[-1]); 
+    $gcd_sum += euclid($i, $j);
+    print "gcd($i, $j) = $gcd_sum\n";  
+
+    $gcd_sum = 0; 
+    @values =  all_unique_pairs(4);
+    for my $pair (@values[0 .. @values - 2]){
+        my($i, $j) = split(/-/, $pair);
+        $gcd_sum += euclid($i, $j);
+        print "gcd($i, $j) + ";  
+    }
+    ($i, $j) = split(/-/, $values[-1]); 
+    $gcd_sum += euclid($i, $j);
+    print "gcd($i, $j) = $gcd_sum\n";  
+}
\ No newline at end of file
diff --git a/challenge-089/adam-russell/perl/ch-2.pl b/challenge-089/adam-russell/perl/ch-2.pl
index e69de29bb2..a427d8169e 100644
--- a/challenge-089/adam-russell/perl/ch-2.pl
+++ b/challenge-089/adam-russell/perl/ch-2.pl
@@ -0,0 +1,40 @@
+use strict;
+use warnings;
+##
+# Write a script to display matrix as below with numbers 1 - 9. 
+# Please make sure numbers are used once.
+##
+use boolean;
+use Math::GSL::Permutation q/:all/;
+
+sub validate {
+    my($a, $b, $c, $d, $e, $f, $g, $h, $i) = @_;
+    return false if ($a + $b + $c) != 15;
+    return false if ($d + $e + $f) != 15;
+    return false if ($g + $h + $i) != 15;
+    return false if ($a + $d + $g) != 15;
+    return false if ($b + $e + $h) != 15;
+    return false if ($c + $f + $i) != 15;
+    return false if ($a + $e + $i) != 15;
+    return false if ($c + $e + $g) != 15;
+    return true;
+}
+
+sub print_matrix {
+    my($a, $b, $c, $d, $e, $f, $g, $h, $i) = @_;
+    print "[ $a $b $c ]\n";
+    print "[ $d $e $f ]\n";
+    print "[ $g $h $i ]\n";
+}    
+
+MAIN:{
+    my $permutation = new Math::GSL::Permutation(9);
+    while(gsl_permutation_next($permutation->raw) == 0){
+        my @values =  $permutation->as_list();
+        @values = map { $_ + 1 } @values;
+        do { 
+            print_matrix(@values);
+            print "\n";
+        }if validate(@values);  
+    }
+}
\ No newline at end of file
diff --git a/challenge-089/adam-russell/prolog/ch-1.p b/challenge-089/adam-russell/prolog/ch-1.p
index e69de29bb2..1d1a9a7146 100644
--- a/challenge-089/adam-russell/prolog/ch-1.p
+++ b/challenge-089/adam-russell/prolog/ch-1.p
@@ -0,0 +1,37 @@
+range_list(0, [0]).
+range_list(N, List):-
+    range_list(N, [], List).
+range_list(0, List, List).
+range_list(N, ListAccum, List):-
+    N0 is N - 1,
+    range_list(N0, [N|ListAccum], List).
+
+unique_pairs(List, Pairs):-
+    unique_pairs(List, List, [], Pairs).
+
+unique_pairs([], [], Pairs, Pairs).
+unique_pairs([_|T0], [], PairsAccum, Pairs):-
+   unique_pairs(T0, T0, PairsAccum, Pairs).
+unique_pairs([H0|T0], [H1|T1], PairsAccum, Pairs):-
+   \+ member([H0, H1], PairsAccum),
+   \+ member([H1, H0], PairsAccum),
+   H0 \= H1,
+   unique_pairs([H0|T0], T1, [[H0, H1]|PairsAccum], Pairs).
+unique_pairs([H0|T0], [_|T1], PairsAccum, Pairs):-
+   unique_pairs([H0|T0], T1, PairsAccum, Pairs).
+
+write_gcd_pairs(Pairs):-
+    write_gcd_pairs(Pairs, 0).
+write_gcd_pairs([[I,J]|[]], Sum):-
+    Sum0 is Sum + gcd(I, J),
+    format("gcd(~d, ~d) = ~d ~n", [I, J, Sum0]).
+write_gcd_pairs([[I,J]|T], Sum):-
+    format("gcd(~d, ~d) + ", [I, J]),
+    Sum0 is Sum + gcd(I, J),
+    write_gcd_pairs(T, Sum0).
+
+main:-
+    range_list(4, L),
+    unique_pairs(L, Pairs),
+    write_gcd_pairs(Pairs),
+    halt.
\ No newline at end of file
diff --git a/challenge-089/adam-russell/prolog/ch-2.p b/challenge-089/adam-russell/prolog/ch-2.p
index e69de29bb2..bebeaeda06 100644
--- a/challenge-089/adam-russell/prolog/ch-2.p
+++ b/challenge-089/adam-russell/prolog/ch-2.p
@@ -0,0 +1,43 @@
+all_unique(_, []).
+all_unique(L, [V|T]) :-
+    fd_exactly(1, L, V),
+    all_unique(L, T).
+
+pwc_matrix(R1,R2,R3) :-
+    R1 = [A, B, C],
+    R2 = [D, E, F],
+    R3 = [G, H, I],
+    /* each element is a number from 1 to 9 */  
+    fd_domain([A, B, C], 1, 9),
+    fd_domain([D, E, F], 1, 9),
+    fd_domain([G, H, I], 1, 9),
+    /* ensure each element is unique */
+    all_unique([A, B, C, D, E, F, G, H, I], [1, 2, 3, 4, 5, 6, 7, 8, 9]),
+    /* row constraints */
+    A + B + C #= 15,
+    D + E + F #= 15,
+    G + H + I #= 15,
+    /* column constraints */
+    A + D + G #= 15,
+    B + E + H #= 15,
+    C + F + I #= 15,
+    /* diagonal constraints */
+    A + E + I #= 15,
+    C + E + G #= 15,
+    /* label all variables to instantiate one solution */  
+    fd_labeling([A, B, C, D, E, F, G, H, I]).  
+
+write_rows([]).
+write_rows([H|T]):-
+    format('[ ~d ~d ~d ]~n', H),
+    write_rows(T).
+
+write_solutions([]). 
+write_solutions([H|T]):-
+   write_rows(H), 
+   nl,
+   write_solutions(T). 
+
+main :-
+    findall([R1,R2,R3], pwc_matrix(R1,R2,R3), Solutions),  
+    write_solutions(Solutions). 
\ No newline at end of file
-- 
cgit