225 lines
21 KiB
TypeScript
225 lines
21 KiB
TypeScript
const input =
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`.split("\n");
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function isNum(c: string) {
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return !isNaN(parseInt(c));
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}
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console.log("");
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console.log("Advent of Code 2023 - Day 3");
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console.log("");
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let sum1 = 0;
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let sum2 = 0;
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let gears = [];
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let nums = [];
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for (const [i, line] of input.entries()) {
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// Regex to extract asterisks and their position from string
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const regexGears = /(\*)/g;
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let matchGears;
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while ((matchGears = regexGears.exec(line))) {
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const gear = {
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x: matchGears.index,
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y: i,
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};
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gears.push(gear);
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}
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// regex to extract numbers + their position from string
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const regexNum = /(\d+)/g;
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let matchNum;
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while ((matchNum = regexNum.exec(line))) {
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const num = {
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value: parseInt(matchNum[0]),
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x1: matchNum.index - 1,
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x2: matchNum.index + matchNum[0].length,
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y1: i - 1,
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y2: i + 1,
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};
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// Check if the number is adjacent to a symbol
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loop: for (let y = num.y1; y <= num.y2; y++) {
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for (let x = num.x1; x <= num.x2; x++) {
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const symbol = input[y]?.[x];
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if (symbol && symbol !== "." && !isNum(symbol)) {
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nums.push(num);
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sum1 += num.value;
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break loop;
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}
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}
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}
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}
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}
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// Iterate gears to find ones that are adjacent to 2 numbers
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for (const gear of gears) {
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let count = 0;
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let matches = [];
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for (const num of nums) {
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if (
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gear.x >= num.x1 &&
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gear.y >= num.y1 &&
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gear.x >= num.x1 &&
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gear.y <= num.y2 &&
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gear.x <= num.x2 &&
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gear.y >= num.y1 &&
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gear.x <= num.x2 &&
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gear.y <= num.y2
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) {
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matches.push(num);
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count++;
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}
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}
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if (count === 2) {
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sum2 += matches[0].value * matches[1].value;
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}
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}
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console.log("Part 1: " + sum1);
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console.log("Part 2: " + sum2);
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