From c7ef15b354f3235611dff6eca4a8da4d256e4ba7 Mon Sep 17 00:00:00 2001
From: Fung Cheok Yin <61836418+E7-87-83@users.noreply.github.com>
Date: Sun, 12 Jul 2020 22:25:27 +0800
Subject: Add files via upload

---
 ch-1.pl | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 ch-1.pl

diff --git a/ch-1.pl b/ch-1.pl
new file mode 100644
index 0000000000..bfffdfe43f
--- /dev/null
+++ b/ch-1.pl
@@ -0,0 +1,87 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+
+# Usage: ch-1.pl M N a_(1,1) a_(1,2) ... a(M,N) 
+# Perl Weekly Challenge #068 Task 1 Zero Matrix
+
+my @matrix;
+my ($M, $N);
+$M = 4; $N = 3;
+@matrix =  ([0, 1, 0, 1] ,[ 1, 0,1, 1] ,[1, 1, 1, 1]);
+
+if ($ARGV[0] and $ARGV[1]) {
+    $M = $ARGV[0];
+    $N = $ARGV[1];
+    @matrix = ();
+    die "parameter(s) problem" unless scalar @ARGV == ($M*$N+2);
+}
+
+for my $i (0..$N-1) {
+    my @s = ();
+    for my $j (0..$M-1) {
+        push @s, $ARGV[$N*$i+$j +2 ];
+    }
+    push @matrix, \@s ;
+}
+
+my @newmatrix;
+
+for my $i (0..$N-1) {
+    my @s = ();
+    for my $j (0..$M-1) {
+        push @s, 1;
+    }
+    push @newmatrix, \@s;
+}
+
+
+my @zerorow = ();
+my @zerocol = ();
+
+for my $i (0..$N-1) {
+    for my $j (0..$M-1) {
+        if ($matrix[$i][$j] == 0) {
+    #   if (${@matrix[$i]}[$j] == 0) {  improve after using warnings
+            push @zerorow, $i;
+            push @zerocol, $j;
+        }
+    }
+}
+
+sub assignzerorow {
+    my $r = $_[0];
+    for my $j (0..$M-1) {
+        $newmatrix[$r][$j] = 0;
+    }
+}
+
+sub assignzerocol {
+    my $c = $_[0];
+    for my $i (0..$N-1) {
+        $newmatrix[$i][$c] = 0;
+    }
+}
+
+print "\n";
+
+for my $i (0..$N-1) {
+    for my $j (0..$M-1) {
+        print $matrix[$i][$j], " ";
+    }
+    print "\n";
+}
+
+print " * * * * * * * \n";
+
+print "\n";
+assignzerorow($_) foreach (@zerorow);
+assignzerocol($_) foreach (@zerocol);
+
+for my $i (0..$N-1) {
+    for my $j (0..$M-1) {
+        print $newmatrix[$i][$j], " ";
+    }
+    print "\n";
+}
+
-- 
cgit