Area of Triangle - I tried to solve [this](https://algo.codemarshal.org/problems/556b5fc29c5e850300c49caf) using Heron's formula, but CodeMarshal won't accept it

triangleArea.cpp

#include <iostream>
#include <cmath>
#include <algorithm>
#include <iomanip>

void clearIO()
{
    int ch;
    while ((ch = std::cin.get()) != std::cin.eof() && ch != '\n');
}

int main(int argc, char* argv[])
{
    int cn;
    std::cin >> cn;
    cn = abs(cn);
    if (cn <= 100) {
        double inps[cn][3];
        double areas[cn];
        clearIO();
        for (int i = 0; i < cn; i++) {
            std::cin >> inps[i][0] >> inps[i][1] >> inps[i][2];
            clearIO();
        }
        for (int d = 0; d < cn; d++) {
            double a = inps[d][0],
                b = inps[d][1],
                c = inps[d][2];
            double s = (a+b+c)/2;
            areas[d] = sqrt(s*(s-a)*(s-b)*(s-c));
            std::cout << "Case " << d + 1 << ": " << std::fixed << std::setprecision (10) << areas[d] << std::endl;
        }
    }
    return 0;
}

Look at the oldest revision for my most recent attempt at "debugging" (I posted the most recent version first, sorry 😵 ).

Mother of Gods... CodeMarshal accepted it 😆, needed the magical precision of TEN 😵