Challenge2024>ProblemDay 2>Input

type InputData ={
  reports: Array<Array<number>>,
};

const solution: Fn = async ({ reports }) => {
  let count = 0;

  for (let i = 0; i < reports.length; i++) {
    await checkSafety(reports[i])
      .then(() => count++)
      .catch(() => {});
  }

  return count;
};

const checkSafety: CheckFn = async (report) => {
  const promise = new Promise<boolean>(async (resolve, reject) => {
    setTimeout(() => {
      const first = report[0];
      const second = report[1];
      const isAscending = first < second;
      let isReportSafe = true;

      for (let j = 0; j < report.length - 1; j++) {
        const level = report[j];
        const nextLevel = report[j + 1];

        const diff = Math.abs(level - nextLevel);
        if (diff === 0 || diff > 3) {
          isReportSafe = false;
          break;
        }

        if (isAscending && level > nextLevel) {
          isReportSafe = false;
          break;
        }

        if (!isAscending && level < nextLevel) {
          isReportSafe = false;
          break;
        }
      }

      if (isReportSafe) { resolve(true); }
      else { reject(false); }
    });
  });

  return promise;
};

const solution: Fn = async ({ reports }) => {
  let count = 0;

  for (let i = 0; i < reports.length; i++) {
    let safe = 0;
    const report = reports[i];

    // check part 1 for checkSafety definition
    const main = checkSafety(report)
      .then(() => safe++)
      .catch(() => {});

    const tests = report.map((_, j) => {
      const newReport = [...report];
      newReport.splice(j, 1);
      return checkSafety(newReport)
        .then(() => safe++)
        .catch(() => {});
    });

    await Promise.all([main, ...tests]);

    if (safe > 0) { count++; }
  }

  return count;
};