aoc-2023-06.js

const { u } = require("../../tools/utils");

let input = "./input.txt";
//input = "./input_demo.txt";

const lines = u.readInputLines(input);

const times = lines[0]
  .split(" ")
  .filter((o) => o.trim() != "" && !isNaN(o.trim()))
  .map((o) => Number(o));
const distances = lines[1]
  .split(" ")
  .filter((o) => o.trim() != "" && !isNaN(o.trim()))
  .map((o) => Number(o));

// Part 1
const winCounts = [];
for (i = 0; i <= times.length - 1; i++) {
  const winningDistances = [];
  for (var ms = 0; ms <= times[i]; ms++) {
    const distance = (times[i] - ms) * ms;
    if (distance > distances[i]) winningDistances.push(distance);
  }
  winCounts.push(winningDistances.length);
}

const partOneAnswer = winCounts.reduce((a, c) => (a *= c), 1);
console.log("Part 1:", partOneAnswer);

// Part 2
const time2 = Number(lines[0].split(":")[1].replaceAll(" ", ""));
const dist2 = Number(lines[1].split(":")[1].replaceAll(" ", ""));

console.time("runtime");
const winDist2 = [];
for (var ms = 0; ms <= time2; ms++) {
  const distance = (time2 - ms) * ms;
  if (distance > dist2) winDist2.push(distance);
}
console.timeEnd("runtime"); // 340 ms

const partTwoAnswer = winDist2.length;
console.log("Part 2:", partTwoAnswer);