blob: c98cbdf9fa79cd31260b321b8c9503dbaff1685b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
#!/usr/bin/env perl
# Task 1: Duplicate Removals
# Submitted by: Mohammad Sajid Anwar
#
# You are given a string, $str, consisting of lowercase English letters.
#
# Write a script to return the final string after all duplicate removals have been made. Repeat duplicate removals on the given string until we no longer can.
#
# A duplicate removal consists of choosing two adjacent and equal letters and removing them.
#
# Example 1
# Input: $str = 'abbaca'
# Output: 'ca'
#
# Step 1: Remove 'bb' => 'aaca'
# Step 2: Remove 'aa' => 'ca'
#
# Example 2
# Input: $str = 'azxxzy'
# Output: 'ay'
#
# Step 1: Remove 'xx' => 'azzy'
# Step 2: Remove 'zz' => 'ay'
#
# Example 3
# Input: $str = 'aaaaaaaa'
# Output: ''
#
# Step 1: Remove 'aa' => 'aaaaaa'
# Step 2: Remove 'aa' => 'aaaa'
# Step 3: Remove 'aa' => 'aa'
# Step 4: Remove 'aa' => ''
#
# Example 4
# Input: $str = 'aabccba'
# Output: 'a'
#
# Step 1: Remove 'aa' => 'bccba'
# Step 2: Remove 'cc' => 'bba'
# Step 3: Remove 'bb' => 'a'
#
# Example 5
# Input: $str = 'abcddcba'
# Output: ''
#
# Step 1: Remove 'dd' => 'abccba'
# Step 2: Remove 'cc' => 'abba'
# Step 3: Remove 'bb' => 'aa'
# Step 4: Remove 'aa' => ''
use strict;
use warnings;
my $str = 'abbaca';
get_noduplicate($str);
$str = 'azxxzy';
get_noduplicate($str);
$str = 'aaaaaaaa';
get_noduplicate($str);
$str = 'aabccba';
get_noduplicate($str);
$str = 'abcddcba';
get_noduplicate($str);
exit 0;
sub get_noduplicate {
my $str_orig = shift;
my $str = $str_orig;
do {
$str =~ s/(\w)\1//;
} while $str =~ /(\w)\1/;
printf "'%s' -> '%s'\n", $str_orig, $str;
}
|
