adventofcode2023/day3.ts
2023-12-03 16:41:45 +01:00

225 lines
21 KiB
TypeScript

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