Week 210 Task 2

1 files changed, 40 insertions, 0 deletions

diff --git a/challenge-210/cheok-yin-fung/perl/ch-2.pl b/challenge-210/cheok-yin-fung/perl/ch-2.pl
new file mode 100644
index 0000000000..34ef750338
--- /dev/null
+++ b/challenge-210/cheok-yin-fung/perl/ch-2.pl
@@ -0,0 +1,40 @@
+# The Weekly Challenge 210
+# Task 2 Number Collision
+use v5.30.0;
+use warnings;
+sub nc {
+    my @a = $_[0]->@*;
+    my $num_of_coll;
+    do {
+        my @remain = ();
+        my $last_ind = -1;
+        $num_of_coll = 0;
+        for my $i (1..$#a) {
+            if ($a[$i-1] >= 0 && $a[$i] <= 0) {
+                if ($a[$i-1] != 0 || $a[$i] != 0) {
+                    push @remain, $a[$i-1] if abs($a[$i-1]) > abs($a[$i]);
+                    push @remain, $a[$i] if abs($a[$i-1]) < abs($a[$i]);
+                    $num_of_coll++;
+                    $last_ind = $i;
+                    last;
+                }
+            }
+            else {
+                push @remain, $a[$i-1];
+                $last_ind = $i-1;
+            }
+        }
+        push @remain, @a[$last_ind+1..$#a];
+        @a = @remain;
+    } until ($num_of_coll == 0);
+    return [@a];
+}
+
+
+
+use Test::More tests=>4;
+use Test::Deep;
+cmp_deeply nc([2, 3, -1]), [2, 3];
+cmp_deeply nc([3, 2, -4]), [-4];
+cmp_deeply nc([1, -1]), [];
+cmp_deeply nc([-1, 1]), [-1, 1];