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| -rw-r--r-- | challenge-196/bob-lied/README | 4 | ||||
| -rwxr-xr-x | challenge-196/bob-lied/perl/ch-1.pl | 80 | ||||
| -rwxr-xr-x | challenge-196/bob-lied/perl/ch-2.pl | 74 |
3 files changed, 156 insertions, 2 deletions
diff --git a/challenge-196/bob-lied/README b/challenge-196/bob-lied/README index 08e4900b33..1eebe9fbd4 100644 --- a/challenge-196/bob-lied/README +++ b/challenge-196/bob-lied/README @@ -1,3 +1,3 @@ -Solutions to weekly challenge 194 by Bob Lied +Solutions to weekly challenge 196 by Bob Lied -https://perlweeklychallenge.org/blog/perl-weekly-challenge-194/ +https://perlweeklychallenge.org/blog/perl-weekly-challenge-196/ diff --git a/challenge-196/bob-lied/perl/ch-1.pl b/challenge-196/bob-lied/perl/ch-1.pl new file mode 100755 index 0000000000..3bdef2e8fd --- /dev/null +++ b/challenge-196/bob-lied/perl/ch-1.pl @@ -0,0 +1,80 @@ +#!/usr/bin/env perl +# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu: +#============================================================================= +# Perl Weekly Challenge Week 196, Challenge 1 +#============================================================================= +# Copyright (c) 2022, Bob Lied +#============================================================================= +# You are given a list of integers, @list. +# Write a script to find out subsequence that respect Pattern 132. +# Return empty array if none found. +# Pattern 132 in a sequence (a[i], a[j], a[k]) +# such that i < j < k and a[i] < a[k] < a[j]. +# Example 1 Input: @list = (3, 1, 4, 2) +# Output: (1, 4, 2) respect the Pattern 132. +# Example 2 Input: @list = (1, 2, 3, 4) +# Output: () since no susbsequence can be found. +# Example 3 Input: @list = (1, 3, 2, 4, 6, 5) +# Output: (1, 3, 2) more than one subsequence found, return first. +# Example 4 Input: @list = (1, 3, 4, 2) +# Output: (1, 3, 2) +# +#============================================================================= + +use v5.36; + +use List::Util qw/first/; +use List::MoreUtils qw/after_incl/; + +use Getopt::Long; +my $Verbose = 0; +my $DoTest = 0; + +GetOptions("test" => \$DoTest, "verbose" => \$Verbose); +exit(!runTest()) if $DoTest; + +my @list = @ARGV; +my $answer = find132(\@list); +say "(", join(", ", $answer->@*), ")"; +exit 0; + +sub is132($list, $i1, $i2, $i3) +{ + return $list->[$i1] < $list->[$i2] + && $list->[$i1] < $list->[$i3] + && $list->[$i2] < $list->[$i3]; +} + +sub find132($list) +{ + return [] if scalar(@$list) < 3; + + while ( my $first = shift @$list ) + { + my @tail = after_incl { $_ > $first } $list->@*; + while ( my $middle = shift @tail ) + { + my $last = first { $_ > $first && $_ < $middle } @tail; + if ( $last ) + { + return [ $first, $middle, $last ]; + } + } + } + return []; +} + +sub runTest +{ + use Test2::V0; + + is( find132( [ 3,2,1,0 ] ), [ ], "Descending"); + is( find132( [ 1,3,2 ] ), [1,3,2], "Obvious"); + is( find132( [ 3,1,4,2 ] ), [1,4,2], "Example 1"); + is( find132( [ 1,2,3,4 ] ), [ ], "Example 2"); + is( find132( [ 1,3,2,4,6,5 ] ), [1,3,2], "Example 3"); + is( find132( [ 1,3,4,2 ] ), [1,3,2], "Example 4"); + + done_testing; +} + diff --git a/challenge-196/bob-lied/perl/ch-2.pl b/challenge-196/bob-lied/perl/ch-2.pl new file mode 100755 index 0000000000..08eccfd031 --- /dev/null +++ b/challenge-196/bob-lied/perl/ch-2.pl @@ -0,0 +1,74 @@ +#!/usr/bin/env perl +# vim:set ts=4 sw=4 sts=4 et ai wm=0 nu: +#============================================================================= +# Perl Weekly Challenge Week 196 Task 2 Range List +#============================================================================= +# Copyright (c) 2022, Bob Lied +#============================================================================= +# You are given a sorted unique integer array, @array. +# Write a script to find all possible Number Range i.e [x, y] represent range +# all integers from x and y (both inclusive). +# Each subsequence of two or more contiguous integers +# Example 1 Input: @array = (1,3,4,5,7) +# Output: [3,5] +# Example 2 Input: @array = (1,2,3,6,7,9) +# Output: [1,3], [6,7] +# Example 3 Input: @array = (0,1,2,4,5,6,8,9) +# Output: [0,2], [4,6], [8,9] +# +#============================================================================= + +use v5.36; + + +use Getopt::Long; +my $Verbose = 0; +my $DoTest = 0; + +GetOptions("test" => \$DoTest, "verbose" => \$Verbose); +exit(!runTest()) if $DoTest; + +for my $arg ( @ARGV ) +{ + $arg =~ tr/[(),/ /; + my @array = split(' ', $arg); + + my $result = findRun(\@array); + + say join(', ', map { "[@$_]" } $result->@* ); +} + +sub findRun($list) +{ + my $len = scalar(@$list); + return [[]] if $len < 2; + + my @run = (); + my ($i, $j) = (0,1); + while ( $i < $len ) + { + $j = $i + 1; + while ( $j < $len && $list->[$j] == ($list->[$j-1]+1) ) + { + $j++; + } + if ( $j - $i > 1 ) + { + push @run, [ $list->[$i], $list->[$j-1] ]; + } + $i = $j; + } + return \@run; +} + +sub runTest +{ + use Test2::V0; + + is( findRun( [ 1,3,4,5,7 ] ), [ [3,5] ], "Example 1"); + is( findRun( [ 1,2,3,6,7,9 ] ), [ [1,3], [6,7] ], "Example 2"); + is( findRun( [ 0,1,2,4,5,6,8,9 ] ), [ [0,2], [4,6], [8,9] ], "Example 3"); + + done_testing; +} + |
