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2023 day 3

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tristan 2023-12-03 21:00:47 +00:00
parent 5f4895b700
commit 9cc373290b
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467..114..
...*......
..35..633.
......#...
617*......
.....+.58.
..592.....
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...$.*....
.664.598..

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2023/03/input.txt Normal file
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519..................13......341.................481....=.....$............-.......211.......92.......*.....................................
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enum LogLevel {
Answer,
Info,
Debug,
}
const LOG_LEVEL = LogLevel.Info;
const print = (level: keyof typeof LogLevel, msg: string) => {
if (LogLevel[level] <= LOG_LEVEL) {
console.log(level+': '+msg);
}
}
const file = Bun.file("input.txt");
const input = await file.text();
function* findNumbers (schematic: string[]) {
const matcher = /[0-9]+/g;
for (const i in schematic) {
const line = schematic[i];
for (let res = matcher.exec(line); res !== null; res = matcher.exec(line)) {
const start = matcher.lastIndex - res[0].length;
const end = matcher.lastIndex - 1;
print('Debug',`"${res[0]}" at [${start}-${end}]`);
yield {
line: Number(i),
index: start,
len: res[0].length,
num: Number(res[0])
};
}
}
}
interface Match {
line: number,
index: number,
len: number,
num: number,
}
function isPartNumber (schematic: string[], match: Match): boolean {
const width = schematic[0].length - 1;
const height = schematic.length - 1;
let surroundings = "";
const start = Math.max(match.index-1, 0);
const end = Math.min(match.index + match.len, width);
if (match.line > 0) {
surroundings += schematic[match.line - 1].slice(start, end + 1) + " ";
}
if (match.index > 0) {
surroundings += schematic[match.line][start] + " ";
}
if (match.index + match.len + 1 < width) {
surroundings += schematic[match.line][end] + " ";
}
if (match.line < height) {
surroundings += schematic[match.line + 1].slice(start, end + 1) + " ";
}
print('Debug', `surroundings: ${surroundings}`)
return /[^0-9. ]/g.test(surroundings);
}
function main(): void {
const lines = input.trim().split("\n");
for (const line of lines) {
print('Info', line);
}
const partNumbers = [];
for (const match of findNumbers(lines)) {
if (isPartNumber(lines,match)) {
partNumbers.push(match.num);
}
}
print('Debug', `Part Numbers: ${partNumbers}`)
print('Answer', `${partNumbers.reduce((a,b)=>a+b)}`)
}
main();

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2023/03/part2.ts Normal file
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enum LogLevel {
Answer,
Info,
Debug,
}
const LOG_LEVEL = LogLevel.Debug;
const print = (level: keyof typeof LogLevel, msg: string) => {
if (LogLevel[level] <= LOG_LEVEL) {
console.log(level+': '+msg);
}
}
const file = Bun.file("input.txt");
const input = await file.text();
function* findGears (schematic: string[]) {
const matcher = /\*/g;
for (const i in schematic) {
const line = schematic[i];
for (let res = matcher.exec(line); res !== null; res = matcher.exec(line)) {
const index = matcher.lastIndex - 1;
const end = matcher.lastIndex - 1;
print('Debug',`[${Number(i)+1},${index+1}]`);
yield {
line: Number(i),
index,
};
}
}
}
interface Match {
line: number,
index: number,
}
function neighbours (schematic: string[], match: Match): number[] {
const lastCol = schematic[0].length - 1;
const lastRow = schematic.length - 1;
function inbounds(x,y) {
return x >= 0 && y >= 0 && x <= lastCol && y <= lastRow;
}
const matches = [];
for (let y of [match.line-1, match.line, match.line+1]) {
let left = match.index-1;
while (inbounds(left,y) && /[0-9]/.test(schematic[y][left])) {
left--;
};
left = Math.max(left, 0);
let right = match.index+1;
while (inbounds(right,y) && /[0-9]/.test(schematic[y][right])) {
right++;
};
right = Math.min(right, lastCol+1);
const substr = schematic[y].slice(left,right);
const matcher = /[0-9]+/g;
for (let res = matcher.exec(substr); res !== null; res = matcher.exec(substr)) {
matches.push(...res)
}
}
print('Debug', `neighbours: ${matches}`);
return matches.map(Number);
}
function main(): void {
const lines = input.trim().split("\n");
for (const line of lines) {
print('Info', line);
}
let total = 0;
for (const match of findGears(lines)) {
const nums = neighbours(lines,match)
if (nums.length === 2) {
const ratio = nums[0] * nums[1];
print('Debug', `adding ${ratio}`);
total += ratio;
}
}
print('Answer', total);
}
main();
// too low: 83445843

1
README.md
View file

@ -65,4 +65,5 @@ if (advent) {
#### [2023](https://adventofcode.com/2023 "2023 puzzle calendar")
1. [:star: :star:](https://adventofcode.com/2023/day/1 "see puzzle")
2. [:star: :star:](https://adventofcode.com/2023/day/2 "see puzzle")
3. [:star: :star:](https://adventofcode.com/2023/day/3 "see puzzle")