pwc-174

7 files changed, 172 insertions, 0 deletions

diff --git a/challenge-174/steve-g-lynn/julia/ch-1.jl b/challenge-174/steve-g-lynn/julia/ch-1.jl
new file mode 100755
index 0000000000..096223a757
--- /dev/null
+++ b/challenge-174/steve-g-lynn/julia/ch-1.jl
@@ -0,0 +1,19 @@
+#!/usr/bin/env julia
+
+#real	0m1.126s
+#user	0m1.196s
+#sys	0m0.417s
+
+#-- for integer abc.. return a^1+b^2+c^3...
+function get_poly(n::Int) ::Int
+	narry = digits(n); #-- array of digits in reverse order
+	indx=(length(narry)):-1:1
+	return sum(narry .^ indx)
+end
+
+for i in 0:3000000
+	if (get_poly(i)==i)
+		println(i)
+	end
+end
+ 
diff --git a/challenge-174/steve-g-lynn/julia/ch-2.jl b/challenge-174/steve-g-lynn/julia/ch-2.jl
new file mode 100755
index 0000000000..2757d03089
--- /dev/null
+++ b/challenge-174/steve-g-lynn/julia/ch-2.jl
@@ -0,0 +1,24 @@
+#!/usr/bin/env julia
+
+using Combinatorics;
+
+function rank2permutation(a::Vector, n::Int)
+	return nthperm(sort(a),n+1)
+end
+
+
+function permutation2rank(a::Vector)
+	perms=permutations(sort(a))
+	ctr=0
+	for i in perms
+		if (a==i) 
+			break
+		end
+		ctr = ctr+1
+	end
+	return ctr
+end
+
+println(rank2permutation([0,1,2],1)) # [0,2,1]
+println(permutation2rank([1,0,2])) #2				     
+
diff --git a/challenge-174/steve-g-lynn/perl/alt-ch-1.pl b/challenge-174/steve-g-lynn/perl/alt-ch-1.pl
new file mode 100755
index 0000000000..af7b3bd86e
--- /dev/null
+++ b/challenge-174/steve-g-lynn/perl/alt-ch-1.pl
@@ -0,0 +1,29 @@
+#!/usr/bin/env perl
+
+#real	0m7.760s
+#user	0m7.744s
+#sys	0m0.004s
+
+
+
+for my $i (0 .. 3_000_000) { 
+	($i == &get_poly($i)) && print "$i\n"; 
+}
+
+#print &get_poly(518);
+
+sub get_poly {
+#-- for base-10 integer abc.. return a^1+b^2+c^3...
+	my ($n)=@_;
+	my (@nstr)=split(//,$n);
+	my @indx = 1..@nstr;
+	my $retval=0;
+	for my $i (0..(@nstr-1)) {
+	    $retval += ($nstr[$i] ** $indx[$i]);
+  	}
+  	return $retval;
+}
+
+
+
+
diff --git a/challenge-174/steve-g-lynn/perl/ch-1.pl b/challenge-174/steve-g-lynn/perl/ch-1.pl
new file mode 100755
index 0000000000..20dcf208d7
--- /dev/null
+++ b/challenge-174/steve-g-lynn/perl/ch-1.pl
@@ -0,0 +1,32 @@
+#!/usr/bin/env perl
+
+#real	3m31.183s
+#user	3m29.832s
+#sys	0m0.179s
+
+#-- this PDL solution is slow. The alternative
+#-- plain Perl solution in alt-ch-1,pl runs in ~8 seconds. 
+
+use PDL;
+use PDL::NiceSlice;
+use PDL::AutoLoader;
+
+#--make PDL aware of the user-defined fn signature so it broadcasts correctly
+
+broadcast_define('get_poly(a();[o]b())', over { $_[1] .= _get_poly($_[0]); });
+
+#-- now find the sequence by checking ints up to 3_000_000
+
+my $pdl=sequence(long, 3_000_000);
+&get_poly($pdl, (my $out=null) );
+print $pdl->where($pdl==$out),"\n";
+
+#[0 1 2 3 4 5 6 7 8 9 89 135 175 518 598 1306 1676 2427 2646798]
+
+#-- subroutine
+#-- given base-10 integer abc.. return a^1+b^2+c^3...
+sub _get_poly {
+	my $a=pdl split(//,$_[0]);
+	return sum($a ** ( ($a->xvals) + 1) );
+}
+
diff --git a/challenge-174/steve-g-lynn/perl/ch-2.pl b/challenge-174/steve-g-lynn/perl/ch-2.pl
new file mode 100755
index 0000000000..6386bc2f9f
--- /dev/null
+++ b/challenge-174/steve-g-lynn/perl/ch-2.pl
@@ -0,0 +1,31 @@
+#!/usr/bin/env perl
+
+use List::Permutor;
+use Array::Compare;
+
+print &permutation2rank([1,0,2]),"\n"; # 2
+print &rank2permutation([0,1,2],1),"\n"; # 021
+
+sub permutation2rank {
+	my ($rarry) = @_;
+	my $comp = Array::Compare -> new; 
+	my $ctr=0;
+	my $p = new List::Permutor (sort @$rarry);
+	while (my @set = $p->next) {
+		last if $comp->compare($rarry,\@set);
+		$ctr++;
+	}
+	return $ctr;
+}
+
+sub rank2permutation {
+	my ($rarry, $rank) = @_; my $ctr=0;
+	my $p = new List::Permutor (sort @$rarry);
+	my @set=();
+	while (@set = $p->next) {
+		last if $ctr==$rank;
+		$ctr++;
+	}
+	return @set;
+}
+
diff --git a/challenge-174/steve-g-lynn/raku/ch-1.p6 b/challenge-174/steve-g-lynn/raku/ch-1.p6
new file mode 100755
index 0000000000..d52579a196
--- /dev/null
+++ b/challenge-174/steve-g-lynn/raku/ch-1.p6
@@ -0,0 +1,23 @@
+#!/usr/bin/env raku
+
+#real	1m40.771s
+#user	1m40.149s
+#sys	0m0.150s
+
+for (0..3_000_000) { say $_ if $_ == &get_poly($_) }
+
+sub get_poly (Int $n) {
+#-- for base-10 integer abc.. return a^1+b^2+c^3...
+	my (@nstr)=$n.Str.split('');
+	shift @nstr; pop @nstr;
+	my @indx = 1..@nstr.elems;
+	my $retval=0;
+	for (0..(@nstr.elems-1)) -> $i {
+	    $retval += (@nstr[$i] ** @indx[$i]);
+  }
+  return $retval;
+}
+
+
+
+
diff --git a/challenge-174/steve-g-lynn/raku/ch-2.p6 b/challenge-174/steve-g-lynn/raku/ch-2.p6
new file mode 100755
index 0000000000..f560cdbeed
--- /dev/null
+++ b/challenge-174/steve-g-lynn/raku/ch-2.p6
@@ -0,0 +1,14 @@
+#!/usr/bin/env raku
+
+say &permutation2rank( (1,0,2) ); # 2
+say &rank2permutation( (0,1,2), 1); # (0 2 1)
+
+sub permutation2rank (@arry) {
+	my @perms = @arry.sort.permutations;
+	return @perms.keys.grep( {@perms[$_] eqv @arry} );
+}
+
+sub rank2permutation (@arry, $rank) {
+	return @arry.sort.permutations[$rank];
+}
+