Day 16, part 1

2024-12-22 16:35:18 +00:00 · 2020-12-16 15:12:54 +01:00 · 2020-12-16 15:12:54 +01:00 · eeff1bb041
parent eae7eb7a24
commit eeff1bb041
4 changed files with 340 additions and 2 deletions
--- a/in/16.txt
+++ b/in/16.txt
@ -0,0 +1,261 @@
+departure location: 26-724 or 743-964
+departure station: 33-845 or 864-954
+departure platform: 26-472 or 482-967
+departure track: 27-140 or 158-956
+departure date: 25-884 or 894-952
+departure time: 37-924 or 941-949
+arrival location: 48-311 or 335-972
+arrival station: 39-703 or 724-950
+arrival platform: 40-108 or 114-950
+arrival track: 30-101 or 108-967
+class: 33-386 or 399-949
+duration: 44-444 or 452-956
+price: 27-220 or 234-974
+route: 42-774 or 790-959
+row: 48-900 or 918-956
+seat: 42-165 or 178-949
+train: 45-831 or 842-965
+type: 49-522 or 548-974
+wagon: 32-565 or 588-964
+zone: 27-608 or 617-953
+
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--- a/source/app.d
+++ b/source/app.d
@ -23,6 +23,7 @@ import day12;
 import day13;
 import day14;
 import day15;
+import day16;
 import dayutil;

 immutable string progName = "aoc-2020";
@ -47,6 +48,7 @@ Variant function(int, File, bool, string[])[] programs = [
 	&day13.run,
 	&day14.run,
 	&day15.run,
+	&day16.run,
 ];

 void printUsage(string message = null) {
--- a/source/day15.d
+++ b/source/day15.d
@ -66,6 +66,7 @@ unittest {
 	assert(part1([2,1,3]) == 10);
 	assert(part1([1,2,3]) == 27);

-	assert(part2([0,3,6]) == 175594);
-	assert(part2([1,3,2]) == 2578);
+	// Stop slowing down my unit tests
+	//assert(part2([0,3,6]) == 175594);
+	//assert(part2([1,3,2]) == 2578);
 }
--- a/source/day16.d
+++ b/source/day16.d
@ -0,0 +1,74 @@
+import std.conv;
+
+import dayutil; 
+
+struct Range {
+	this(int start, int end) { this.start = start; this.end = end; }
+	int start;
+	int end;
+}
+
+Variant run(int part, File input, bool bigboy, string[] args) {
+	auto sections = input.byLineCopy.array.splitter!empty.array;
+	Range[][string] fields = parseFields(sections[0]);
+
+	int[][] tickets = sections[2].drop(1).map!(x => x.splitter(",").array.map!(to!int).array).array;
+
+	return Variant(parts!int(part, 
+				() => part1(fields.byValue.joiner.array, tickets)));
+}
+
+Range[][string] parseFields(R)(R input) if (isInputRange!R && isSomeString!(ElementType!R)) {
+	Range[][string] result;
+
+	foreach(line; input) {
+		auto split1 = line.splitter(": ").array;
+
+		Range[] ranges = split1[1].splitter(" or ").map!((e) {
+			int[] parts = e.splitter("-").array.map!(to!int).array;
+			return Range(parts[0], parts[1]);
+		}).array;
+
+		result[split1[0]] = ranges;
+	}
+
+	return result;
+}
+
+int part1(Range[] allowedValues, int[][] tickets) {
+	int errorRate = 0;
+
+	foreach(number; tickets.joiner()) {
+		if (!allowedValues.canFind!((element, needle) => element.start <= needle && needle <= element.end)(number)) {
+			errorRate += number;
+		}
+		
+	}
+	return errorRate;
+}
+
+unittest {
+	string input = q"EOS
+class: 1-3 or 5-7
+row: 6-11 or 33-44
+seat: 13-40 or 45-50
+
+your ticket:
+7,1,14
+
+nearby tickets:
+7,3,47
+40,4,50
+55,2,20
+38,6,12
+EOS";
+
+	auto sections = input.lineSplitter.splitter!empty.array;
+	Range[][string] fields = parseFields(sections[0]);
+
+	assert(fields["class"] == [Range(1,3), Range(5,7)]);
+
+	int[][] tickets = sections[2].drop(1).map!(x => x.splitter(",").array.map!(to!int).array).array;
+	assert(part1(fields.byValue.joiner.array, tickets) == 71);
+}
+