X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?p=aoc2020.git;a=blobdiff_plain;f=26.pl;fp=26.pl;h=90d07aeb4fcda5c151dc630627f1499ed8510fa6;hp=0000000000000000000000000000000000000000;hb=b957ac325434a1623becbe1850127821a94c38fe;hpb=bd88b6ce6b17f682d28d427209a0795a89c98fc6

diff --git a/26.pl b/26.pl
new file mode 100755
index 0000000..90d07ae
--- /dev/null
+++ b/26.pl
@@ -0,0 +1,34 @@
+#!/usr/bin/perl -w
+
+use strict;
+
+my $timestamp = <>;
+my @buses = split /,/, <>;
+
+my $mins = 1;
+my %bus_time;
+my $first = shift @buses;
+for my $bus (@buses) {
+	if ($bus =~ /\d/) {
+		$bus_time{$bus} = $mins % $bus;
+		print "Bus $bus at t+$mins ($bus_time{$bus})\n";
+	}
+	$mins++;
+}
+
+@buses = grep /\d/, @buses;
+
+my $t = $first;
+my $add = $first;
+
+for my $bus (keys %bus_time) {
+	print "bus $bus at $bus_time{$bus}\n";
+	while (1) {
+		print "t=$t, add=$add\n";
+		last if ($t + $bus_time{$bus}) % $bus == 0;
+		$t += $add;
+	}
+	$add *= $bus;
+}
+print "t=$t\n";
+