My program works fine in console, but for some reason I get wrong answer on test 9. Could someone point out where is the problem in my code?

#include <iostream>
#include <vector>
#include <math.h>
#include <iomanip>

using namespace std;

int main()
{
    double num;
    vector<long long> input;
    int limit  = 256 * 1024 / sizeof(long long);
    for (int k = 0; (cin >> num) && k <= limit; k++)
    {
        if (num != (long long)num || num < 0 || num > pow(10.0, 18))
            return 0;
        input.push_back((long long)num);
    }
    for (int i = input.size() - 1; i >= 0; i--)
        cout << fixed << setprecision(4) << sqrt(input[i]) << endl;

    return 0;
}

Edited by author 28.03.2016 23:17

Edited by author 28.03.2016 23:18

Edited by author 28.03.2016 23:18

Limit is wrong. Min number size is 2 bytes - "1 ".

In common, you shouldn't check if input is correct. It's supposed to be always correct.
Reading like:
while (cin >> number) {
    input.push_back(number);
}
should be enough.

If you want to check input (for lulz?) you should fail your program in more visible way - via return not 0, throw something etc. Judge system will return another error, not WA.


Edited by author 28.03.2016 23:43

Another note.

You read number into double, convert it into long long, convert it back to double and finally call sqrt.
Why do you need 2 conversions in the middle?
Shouldn't you better use vector<double> input?

Sorry for stupid question: what is WA?

"Wrong Answer"

http://acm.timus.ru/help.aspx?topic=judge&locale=en

Possible solution run results are described in "3. The judge tests your solution" topic.