Commits

Shlomi Fish committed 608b62c

Add the solution for Euler #102.

Comments (0)

Files changed (2)

project-euler/102/euler-102-triangles.pl

+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+# We return the area multiplies by 2 for convenience.
+sub triangle_area
+{
+    my ($xa, $ya, $xb, $yb, $xc, $yc) = @_;
+
+    return abs( ($xa-$xc)*($yb-$ya) - ($xa-$xb)*($yc-$ya) );
+}
+
+my $count = 0;
+
+open my $in, "<", "triangles.txt";
+while (my $line = <$in>)
+{
+    chomp($line);
+    
+    my @coords = split(/,/, $line);
+
+    my $main_area = triangle_area(@coords);
+
+    my $sub_areas_total = 0;
+
+    for my $point_to_zero (0 .. 2)
+    {
+        my @new_coords = @coords;
+        # Set the other point to zero. 
+        $new_coords[$point_to_zero*2] = $new_coords[$point_to_zero*2+1] = 0;
+        $sub_areas_total += triangle_area(@new_coords);
+    }
+    
+    if ($sub_areas_total == $main_area)
+    {
+        $count++;
+    }
+}
+close($in);
+
+print "$count\n";

project-euler/102/triangles.txt

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