Hello Monks! I have been given the following assignment, and I am not entirely sure I understand what I need to do. It says: 
Given two ranges, do the following:
1) check if  the start or the end of each range  deviate by more than 
+five 
2) check if the intersection of the range is at least half its union

[download]

I made the following code, that solves part 1 for two sample ranges: 
use Set::IntSpan;

$range1 = Set::IntSpan->new([45 .. 60]);
$range2 = Set::IntSpan->new([49 .. 57]);

$intersect_range = $range1->intersect($range2);
$union_range =  $range1->union($range2);

print "INTERSECT:".$intersect_range."\nUNION:".$union_range."\n";

$diff_between_starts = abs($range1->min-$range2->min);
$diff_between_ends = abs($range1->max-$range2->max);

print "START DIFF:$diff_between_starts\n";
print "END DIFF:$diff_between_ends\n";

if($diff_between_starts<=5 && $diff_between_ends<=5) {print "ALL IS OK
+\n";} 
else {print "PROBLEM\n";}

[download]

My problem is I don't understand what they want in (2). Do they refer to the LENGTH of the intersection being at least half the length of the union?

In reply to union and intersection of ranges by Anonymous Monk

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