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Day Three completed

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This commit is contained in:
Lewis Dale 2023-12-03 12:17:08 +00:00
parent 14a89267fe
commit a29299ede8
3 changed files with 71 additions and 45 deletions
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4
src/day_three.test.ts
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@ -20,4 +20,8 @@ describe('Day Three', () => {
const engine = Engine.create(schematic);
expect(engine.sumPartNumbers()).toEqual(4361);
});
it('should give the sum of the gear ratios', () => {
const engine = Engine.create(schematic, true);
expect(engine.gearRatioSums()).toEqual(467835);
});
});

105
src/day_three.ts
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@ -1,75 +1,90 @@
import { takeWhile } from 'lodash';
import fs from "fs";
import {calculateMinimumCubePowers, calculatePossibleGames, parseGame} from "./day_two";
import {matchAllAndThen} from "./utils";
export class Engine {
constructor(private readonly partNumbers: number[]) {
constructor(private readonly parts: number[][], private readonly schematic: string[][]) {
}
public static create(input: string): Engine {
public static create(input: string, gearsOnly: boolean = false): Engine {
const lines = input.split('\n').filter(Boolean);
const partRegex = /\d+/g;
const symbolRegex = /[^a-zA-Z\d\.]/g;
const symbolRegex = gearsOnly ? /\*/g : /[^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;
}
matchAllAndThen(line, partRegex, (match, index) => {
const parsedNumber = parseInt(match, 10);
for (let i = index; i < index + match.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];
}
});
matchAllAndThen(line, symbolRegex, (match, index) => symbols[lineNumber][index] = match);
});
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[]);
return new Engine(parts, symbols);
}
public sumPartNumbers(): number {
return this.partNumbers.reduce((total, partNumber) => total + partNumber, 0);
const partsList = this.schematic.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 <= this.schematic.length && index >= 0 && index <= row.length)
.map(([rowNum, column]) => {
return this.parts[rowNum][column]
}).filter(Boolean)))
.reduce((total, val) => total + val,0);
})
) as number[];
return partsList.reduce((total, partNumber) => total + partNumber, 0);
}
public gearRatioSums(): number {
return this.schematic.flatMap((row, rowIndex) =>
row
.map((symbol, index) => {
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 <= this.schematic.length && index >= 0 && index <= row.length)
.map(([rowNum, column]) => {
return this.parts[rowNum][column]
}).filter(Boolean)))
})
).filter(list => list.length === 2)
.reduce((total, [a, b]) => {
return total + (a * b)
}, 0);
}
}
export const runDayThree = () => {
const input = fs.readFileSync('./inputs/day_three_input.txt', 'utf8');
const engine = Engine.create(input)
console.log(engine.sumPartNumbers());
console.log(Engine.create(input).sumPartNumbers())
console.log(Engine.create(input, true).gearRatioSums())
}

7
src/utils.ts Normal file
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@ -0,0 +1,7 @@
export const matchAllAndThen = (input: string, pattern: RegExp, callback: (value: string, index: number) => void) => {
[...input.matchAll(pattern)].map(match => {
if (match && match.index !== undefined) {
callback(match[0], match.index);
}
});
}