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Day 16, part 1

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Chris Josten 2020-12-16 15:12:54 +01:00
parent eae7eb7a24
commit eeff1bb041
Signed by: chris
GPG key ID: 1795A594046530AB
4 changed files with 340 additions and 2 deletions
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2
source/app.d
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@ -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) {

5
source/day15.d
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@ -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);
}

74
source/day16.d Normal file
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@ -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);
}