From f54e67106647e18a5b344450ab7f10c8d49750f6 Mon Sep 17 00:00:00 2001
From: Peter Campbell Smith <pj.campbell.smith@gmail.com>
Date: Tue, 17 Jan 2023 10:11:41 +0000
Subject: Week 200 submission

---
 challenge-200/peter-campbell-smith/blog.txt     |  1 +
 challenge-200/peter-campbell-smith/perl/ch-1.pl | 79 +++++++++++++++++++++++++
 challenge-200/peter-campbell-smith/perl/ch-2.pl | 71 ++++++++++++++++++++++
 3 files changed, 151 insertions(+)
 create mode 100644 challenge-200/peter-campbell-smith/blog.txt
 create mode 100755 challenge-200/peter-campbell-smith/perl/ch-1.pl
 create mode 100755 challenge-200/peter-campbell-smith/perl/ch-2.pl

diff --git a/challenge-200/peter-campbell-smith/blog.txt b/challenge-200/peter-campbell-smith/blog.txt
new file mode 100644
index 0000000000..25923544bf
--- /dev/null
+++ b/challenge-200/peter-campbell-smith/blog.txt
@@ -0,0 +1 @@
+https://pjcs-pwc.blogspot.com/
diff --git a/challenge-200/peter-campbell-smith/perl/ch-1.pl b/challenge-200/peter-campbell-smith/perl/ch-1.pl
new file mode 100755
index 0000000000..d63fb8ea2c
--- /dev/null
+++ b/challenge-200/peter-campbell-smith/perl/ch-1.pl
@@ -0,0 +1,79 @@
+#!/usr/bin/perl
+
+# Peter Campbell Smith - 2023-01-16
+# PWC 200 task 1
+
+use v5.28;
+use utf8;
+use warnings;
+
+# Task: Write a script to find out all Arithmetic Slices for the given array of integers. An integer array is 
+# called arithmetic if it has at least 3 elements and the differences between any three consecutive elements 
+# are the same.
+
+# Blog: 
+
+my (@tests, $test, @array, $rubric, $j, @diff, $last_diff, $run_starts);
+
+@tests = ([1, 2, 3, 4], [1, 2, 3, 4, 6], [0, 1, 5, 9, 13, 22, 99, 101, 102, 103, 105],
+	[0, 0, 0], [-3, 1, 5, 9], [10, 8, 6, 4], [7, 8, 8, 10, 13, 17], [1, 2, 3, 6, 9],
+	[0, 4, 8, 12, 16, 20, 24, 28, 32]);
+
+# loop over tests
+for $test (@tests) {
+	@array = @$test;
+	
+	# initialise
+	$rubric = '';
+	@diff = ();
+	
+	# create @diff array and put a dummy value on the end
+	for $j (0 .. scalar(@array) - 2) {
+		$diff[$j] = $array[$j + 1] - $array[$j];
+	}
+	push @diff, 1e9;
+	
+	# loop over the @diff array looking for runs of the same number
+	$last_diff = 1e9;
+	$run_starts = -1;
+	for $j (0 .. scalar(@array) - 1) {
+		
+		# continuation of a run
+		next if $diff[$j] == $last_diff;
+			
+		# end of a run, possible start of next one
+		analyse($run_starts, $j) if $run_starts >= 0;
+		$run_starts = $j;
+		$last_diff = $diff[$j];
+	}
+	
+	# report result
+	say qq[\nInput:  (] . join(', ', @array) . ')';
+	say qq[Output: ] . ($rubric ? substr($rubric, 0, -2) : '() as no slice found');
+}	
+
+sub analyse {
+	
+	# split a run into sub-runs (eg 1,2,3,4 => 1,2,3; 2,3,4; 1,2,3,4)
+	my ($start, $end) = @_;
+	my ($length, $sub_length, $offset, $j);
+	
+	# minimum run length is 3
+	$length = $end - $start + 1;
+	return if $length < 3;
+	
+	# loop over possible sub-run lengths
+	for $sub_length (3 .. $length) {
+		
+		# loop over possible starting positions
+		for $offset (0 .. $length - $sub_length) {
+			
+			# add sub-run to rubric
+			$rubric .= '(';
+			for $j ($start + $offset .. $start + $offset + $sub_length - 1) {
+				$rubric .= qq[$array[$j], ];
+			}
+			$rubric =~ s|, $|), |;
+		}
+	}
+}
diff --git a/challenge-200/peter-campbell-smith/perl/ch-2.pl b/challenge-200/peter-campbell-smith/perl/ch-2.pl
new file mode 100755
index 0000000000..b675ce9e64
--- /dev/null
+++ b/challenge-200/peter-campbell-smith/perl/ch-2.pl
@@ -0,0 +1,71 @@
+#!/usr/bin/perl
+
+# Peter Campbell Smith - 2023-01-16
+# PWC 200 task 2
+
+use v5.28;
+use utf8;
+use warnings;
+
+# Task: Write a program that accepts any positive integer and draws that number as a horizontal sequence of
+# ASCII seven segment displays.
+
+# Blog: 
+
+my (@tests, @truth, $test, @digit, @display, $offset, $points, $row, $column, $segments, $segment);
+
+@truth = qw[abcdef bc abdeg abcdg bcfg acdfg acdefg abc abcdefg abcfg];
+
+@tests = (200, 31415926535, 9876543210);
+
+# each digit is 7 lines high and 7 characters wide
+# each digit starts 9 characters further right than the previous one
+
+# create digits => character . row . column
+$digit[ord('a')] = '-00 -01 -02 -03 -04 -05 -06';
+$digit[ord('b')] = '|16 |26';
+$digit[ord('c')] = '|46 |56';
+$digit[ord('d')] = '-60 -61 -62 -63 -64 -65 -66';
+$digit[ord('e')] = '|40 |50';
+$digit[ord('f')] = '|10 |20';
+$digit[ord('g')] = '-30 -31 -32 -33 -34 -35 -36';
+
+# loop over tests
+for $test (@tests) {
+	@display = ();
+	$offset = 0;
+	
+	# blank display
+	for $row (0 .. 6) {
+		for $column (0 .. length($test) * 9) {
+			$display[$row][$column] = ' ';
+		}
+	}
+	
+	# loop over digits in $test and blank area of display
+	while ($test =~ m|(.)|g) {   # digit
+		
+		# loop over segments for this digit
+		$segments = $truth[$1];
+		
+		# draw these segments in $display
+		while ($segments =~ m|(.)|g) {
+			$points = $digit[ord($1)];
+			while ($points =~ m|(.)(\d)(\d)|g) {
+				$display[$2][$3 + $offset] = $1;
+			}
+		}
+		
+		# move right 9 characters width (7 for digit plus 2 blank)
+		$offset += 9;
+	}
+	
+	# show the display
+	for $row (0 .. 6) {
+		for $column (0 .. $offset - 2) {
+			print $display[$row][$column];
+		}
+		say '';
+	}
+}	
+
-- 
cgit