47 lines
1.2 KiB
TypeScript
47 lines
1.2 KiB
TypeScript
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import { Problem, readData } from "./solve_1.ts";
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function solve(problem: Problem): boolean {
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function solve_inner(target: number, arr: number[]): boolean {
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if (arr.length === 0) {
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return false;
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}
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if (arr.length === 1) {
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return target === arr[0];
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}
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const [head, ...rest] = arr;
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if (target % head === 0) {
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const div = solve_inner(target / head, rest);
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if (div){
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return true;
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}
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}
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const sub = solve_inner(target - head, rest);
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if (sub){
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return true;
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}
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const str = target.toString();
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const head_str = head.toString();
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if (str.endsWith(head_str)) {
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const new_target = parseInt(str.slice(0, str.length - head_str.length));
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return solve_inner(new_target, rest);
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}
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return false;
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}
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return solve_inner(problem.target, problem.numbers.toReversed());
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}
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if (import.meta.main) {
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const data = await readData("input.txt");
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let count = 0;
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let sum = 0;
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for (const problem of data) {
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if (solve(problem)){
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count++;
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sum += problem.target;
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}
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}
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console.log(sum);
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}
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