58 lines
1.5 KiB
TypeScript
58 lines
1.5 KiB
TypeScript
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export type Problem = {
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piece: string[],
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words: string[]
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};
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export async function readData(path: string): Promise<Problem> {
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const text = await Deno.readTextFile(path);
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const [piece, words] = text.replaceAll("\r", "").split("\n\n");
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return {
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piece: piece.split(",").map(x => x.trim()),
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words: words.split("\n").map(x => x.trim())
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}
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}
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const memo = new Map<string, boolean>();
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export function isAvailableWords(pieces: Set<string>, word: string): boolean {
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if (memo.has(word)) {
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return memo.get(word)!;
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}
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if (word.length === 0) {
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return true;
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}
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if (pieces.size === 0) {
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return false;
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}
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for (const p of pieces) {
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if (word.startsWith(p)) {
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const newWord = word.slice(p.length);
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const newPieces = pieces;
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//new Set(pieces);
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// newPieces.delete(p);
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// console.log(`use ${p} for ${word}, new word is ${newWord}, new pieces are ${[...newPieces].join(", ")}`);
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if (isAvailableWords(newPieces, newWord)) {
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memo.set(word, true);
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return true;
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}
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}
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}
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memo.set(word, false);
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return false;
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}
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if (import.meta.main) {
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const problem = await readData("input.txt");
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console.log(problem);
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const pieces = new Set(problem.piece);
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let count = 0;
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for (const word of problem.words) {
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if (isAvailableWords(pieces, word)) {
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count++;
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}
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}
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console.log(count);
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}
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