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use v6d;
###############################################################################
=begin comment
Perl Weekly Challenge 196
=========================
TASK #2
-------
*Range List*
Submitted by: Mohammad S Anwar
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]
=end comment
###############################################################################
#--------------------------------------#
# Copyright © 2022 PerlMonk Athanasius #
#--------------------------------------#
#==============================================================================
=begin comment
Interface
---------
1. If no command-line arguments are given, the test suite is run.
2. If the first argument is negative, it must be preceded by "--" to distin-
guish it from a command-line flag.
=end comment
#==============================================================================
use Test;
my UInt constant $TEST-FIELDS = 3;
#------------------------------------------------------------------------------
BEGIN
#------------------------------------------------------------------------------
{
"\nChallenge 196, Task #2: Range List (Raku)\n".put;
}
#==============================================================================
multi sub MAIN
(
*@array where array-is-valid( @array ) #= A list of 1 or more integers
)
#==============================================================================
{
"Input: \@array = (%s)\n".printf: @array.join: ',';
my Array[Int] @ranges = find-ranges( @array );
"Output: %s\n".printf:
find-ranges( @array ).map( { '[' ~ @$_.join( ',' ) ~ ']' } ).join: ', ';
}
#==============================================================================
multi sub MAIN() # Run the test suite
#==============================================================================
{
run-tests();
}
#------------------------------------------------------------------------------
sub find-ranges( List:D[Int:D] $array --> List:D[List:D[Int:D]] )
#------------------------------------------------------------------------------
{
my (Array[Int] @ranges, Int @range);
for @$array -> Int $n
{
if @range.elems == 0 || # Start the first range
$n == @range[ *-1 ] + 1 # Extend an existing range
{
@range.push: $n;
}
else # Start a new range
{
# First, handle (either keep or discard) the previous range
@ranges.push: @range.clone if @range.elems > 1;
@range = $n;
}
}
@ranges.push: @range if @range.elems > 1; # Handle the final range
@$_ = $_[ 0, *-1 ] for @ranges; # Remove all middle elements from ranges
return @ranges;
}
#------------------------------------------------------------------------------
sub array-is-valid( List:D[Int:D] $array --> Bool:D )
#------------------------------------------------------------------------------
{
return False unless $array.elems >= 1; # Array must not be empty
my UInt %integers{Int};
for @$array -> Int $n # Test whether array elements are unique
{
return False if ++%integers{ $n } > 1;
}
my Int @sorted = $array.sort; # Test whether array elements are sorted
return @sorted ~~ $array;
}
#------------------------------------------------------------------------------
sub run-tests()
#------------------------------------------------------------------------------
{
'Running the test suite'.put;
for test-data.lines -> Str $line
{
my Str ($test-name, $input, $expected) =
$line.split: / \| /, $TEST-FIELDS;
$input ~~ s/ ^ \s* (.+) \s* $ /$0/; # Trim whitespace
$expected ~~ s/ ^ \s* (.+) \s* $ /$0/;
my Int @array = $input .split( / \s+ /, :skip-empty )
.map: { .Int };
my Array[Int] @ranges = find-ranges( @array );
my Str $got = @ranges.map( { '[' ~ join( ',', @$_ ) ~ ']' } )
.join: ', ';
is $got, $expected, $test-name;
}
done-testing;
}
#------------------------------------------------------------------------------
sub error( Str:D $message )
#------------------------------------------------------------------------------
{
"ERROR: $message".put;
USAGE();
exit 0;
}
#------------------------------------------------------------------------------
sub USAGE()
#------------------------------------------------------------------------------
{
my Str $usage = $*USAGE;
$usage ~~ s:g/ ($*PROGRAM-NAME) /raku $0/;
$usage.put;
}
#------------------------------------------------------------------------------
sub test-data( --> Str:D )
#------------------------------------------------------------------------------
{
return q:to/END/;
Example 1| 1 3 4 5 7 |[3,5]
Example 2| 1 2 3 6 7 9 |[1,3], [6,7]
Example 3| 0 1 2 4 5 6 8 9|[0,2], [4,6], [8,9]
Negatives|-3 -2 -1 1 2 5 6 |[-3,-1], [1,2], [5,6]
END
}
###############################################################################
|
