60 lines
1.5 KiB
TypeScript
60 lines
1.5 KiB
TypeScript
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const cycles = (instruction: string): number => {
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if (instruction === "noop") return 1;
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if (instruction === "addx") return 2;
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return 0;
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};
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export const main = async (lines: string[]): Promise<number | string> => {
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const instructions = lines.map((line) => line.split(" "));
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let signalStrength = 0;
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let cycle = 0;
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const registers = { x: 1 };
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const dim = { width: 40, height: 6 };
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const crt = Array(dim.width * dim.height).fill("");
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for (const [instruction, operand] of instructions) {
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const instCycles = cycles(instruction);
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for (let i = 0; i < instCycles; i++) {
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const crtx = cycle % dim.width;
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crt[cycle] = [registers.x - 1, registers.x, registers.x + 1].includes(
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crtx
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)
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? "#"
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: ".";
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cycle++;
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if (cycle >= 20 && (cycle - 20) % 40 === 0) {
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signalStrength += registers.x * cycle;
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}
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}
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if (instruction === "addx") {
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registers.x += parseInt(operand);
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}
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}
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return Array(dim.height)
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.fill(null)
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.map((_, i) => crt.slice(dim.width * i, dim.width * (i + 1)).join(""))
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.join("\n");
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};
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//
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const isrun = process.argv.length > 1 && process.argv[1] === import.meta.path;
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if (isrun) {
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const file = Bun.file("./problem.txt");
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const text = await file.text();
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const lines = text.split("\n");
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console.log("=== COMPUTATION ===\n");
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const answer = await main(lines);
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console.log("\n=== /COMPUTATION ===\n");
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console.log("=== ANSWER TO P2 ===");
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console.log(answer);
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}
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