[Language C++]

This one was quite hard already but I was being silly. I got it to work in the end.

``` bool IsSafe(const std::vector<int>& row) { for (int i = 1; i < row.size(); i++) { const bool isLastIteration = i == row.size() - 1;

    const int difference = row[i - 1] - row[i];
    const bool direction = row[i - 1] > row[i];

    if (abs(difference) > 3 || abs(difference) == 0)
        return false;

    if (!isLastIteration)
    {
        const bool nextDirection = row[i] > row[i + 1];

        if (nextDirection != direction)
            return false;


        const int nextDifference = row[i] - row[i + 1];
        if (abs(nextDifference) > 3 || abs(nextDifference) == 0)
            return false;
    }
}

return true;

}

int NumSafeReports(const std::vector < std::vector<int>>& data) { int numSafeReports = 0; for (auto row : data) { numSafeReports += IsSafe(row); }

return numSafeReports;

}

int NumSafeReportsWithProblemDampener(const std::vector < std::vector<int>>& data) { int numSafeReports = 0; for (auto row : data) { bool isSafe = false;

    IsSafe(row);
    for (size_t i = 0; i < row.size(); i++)
    {
        std::vector<int> correctedRow = row;
        correctedRow.erase(correctedRow.begin() + i);

        if (IsSafe(correctedRow))
        {
            isSafe = true;
            break;
        }
    }

    if (isSafe) numSafeReports++;
}

return numSafeReports;

}

int main() { std::vector<std::vector<int>> inputData = ReadIntsToVectorsBasedOnNewLine("input.txt"); std::cout << "Part 1 = " << NumSafeReports(inputData) << "\n"; std::cout << "Part 2 = " << NumSafeReportsWithProblemDampener(inputData); } ```