advent-of-code-2023/src/day_three.ts

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import { takeWhile } from 'lodash';
import fs from "fs";
import {calculateMinimumCubePowers, calculatePossibleGames, parseGame} from "./day_two";
export class Engine {
constructor(private readonly partNumbers: number[]) {
}
public static create(input: string): Engine {
const lines = input.split('\n').filter(Boolean);
const partRegex = /\d+/g;
const symbolRegex = /[^a-zA-Z\d\.]/g;
const parts : number[][] = new Array(lines.length).fill(0).map(() => new Array(lines[0].length));
const symbols: string[][] = new Array(lines.length).fill(0).map(() => new Array(lines[0].length));
lines.forEach((line, lineNumber) => {
const matches = [...line.matchAll(partRegex)];
matches.map(match => {
if (match && match.index !== undefined) {
const parsedNumber = parseInt(match[0], 10);
for (let i = match.index; i < match.index + match[0].length; i++) {
parts[lineNumber][i] = parsedNumber;
}
}
});
});
lines.forEach((line, lineNumber) => {
const matches = [...line.matchAll(symbolRegex)];
matches.map(match => {
if (match && match.index !== undefined) {
symbols[lineNumber][match.index] = match[0];
}
});
});
console.log(symbols.length, parts.length)
const partsList = symbols.flatMap((row, rowIndex) =>
row.map((symbol, index) => {
if (!symbol) return symbol;
const partIndex = [
[rowIndex - 1, index - 1],
[rowIndex - 1, index],
[rowIndex - 1, index + 1],
[rowIndex, index - 1],
[rowIndex, index + 1],
[rowIndex + 1, index - 1],
[rowIndex + 1, index],
[rowIndex + 1, index + 1]
];
return Array.from(new Set(partIndex.filter(([rowNum, col]) => rowNum >= 0 && rowNum <= symbols.length && index >= 0 && index <= row.length)
.map(([rowNum, column]) => {
return parts[rowNum][column]
}).filter(Boolean)))
.reduce((total, val) => total + val,0);
})
)
return new Engine(partsList as number[]);
}
public sumPartNumbers(): number {
return this.partNumbers.reduce((total, partNumber) => total + partNumber, 0);
}
}
export const runDayThree = () => {
const input = fs.readFileSync('./inputs/day_three_input.txt', 'utf8');
const engine = Engine.create(input)
console.log(engine.sumPartNumbers());
}