49 lines
1.4 KiB
TypeScript
49 lines
1.4 KiB
TypeScript
import { collectArray, inputLines, measureDuration } from "./common.ts";
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const input = await collectArray(await inputLines("2"));
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type SubmarineCommand = ["forward", number] | ["up", number] | ["down", number];
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// function parseSubmarineCommand(command: string): SubmarineCommand {
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// let [cmd, arg] = command.split(" ", 2);
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// cmd = ["forward", "up", "down"].includes(cmd) ? cmd : "up";
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// return [cmd, parseInt(arg)];
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// }
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export function part1(input: string[]): number {
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let x = 0;
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let y = 0;
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for (const line of input) {
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if (line.startsWith("forward ")) {
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x += parseInt(line.substr(8));
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} else if (line.startsWith("up ")) {
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y -= parseInt(line.substr(3));
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} else if (line.startsWith("down ")) {
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y += parseInt(line.substr(5));
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}
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}
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return x * y;
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}
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await measureDuration(() => console.log("Part 1", part1(input)));
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export function part2(input: string[]): number {
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let x = 0;
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let y = 0;
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let aim = 0;
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for (const line of input) {
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if (line.startsWith("forward ")) {
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const arg = parseInt(line.substr(8));
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x += arg;
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y += aim * arg;
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} else if (line.startsWith("up ")) {
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const arg = parseInt(line.substr(3));
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aim -= arg;
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} else if (line.startsWith("down ")) {
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const arg = parseInt(line.substr(5));
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aim += arg;
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}
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}
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return x * y;
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}
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await measureDuration(() => console.log("Part 2", part2(input)));
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