43 lines
1.1 KiB
D
43 lines
1.1 KiB
D
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import std.stdio;
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import std.algorithm;
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import std.string;
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import std.array;
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import std.conv;
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import std.uni;
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int countMatchingNumbers(string card) {
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const string[] parts = split(card, "|");
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const int[] winningNums = split(parts[0], ":")[1].split(" ")
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.filter!(s => s.length > 0)
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.map!(s => s.strip.to!int)
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.array;
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return parts[1].split(" ")
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.filter!(s => s.length > 0)
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.map!(s => s.strip.to!int)
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.map!(n => canFind(winningNums, n) ? 1 : 0)
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.sum;
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}
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void part1() {
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File("input.txt").byLineCopy()
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.map!(s => countMatchingNumbers(s))
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.map!(n => n < 2 ? n : 1 << n-1)
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.sum.writeln;
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}
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void part2() {
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int[] matchesPerCard = File("input.txt").byLineCopy().map!countMatchingNumbers.array;
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int[] cardCounts = new int[matchesPerCard.length];
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cardCounts[] = 1; // Set all card counts to 1 initially.
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for (int card = 0; card < cardCounts.length; card++) {
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for (int i = 1; i < matchesPerCard[card] + 1; i++) {
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cardCounts[card+i] += cardCounts[card];
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}
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}
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cardCounts.sum.writeln;
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}
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void main() {
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part1();
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part2();
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}
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