#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int proby;
cin >> proby;
int *obzartuchy = new int[proby];
float *w_pudelku = new float[proby];
float *suma = new float[proby];
for (int i = 0; i < proby; i++)
{
suma[i] = 0;
}
for (int i = 0; i < proby; i++)
{
cin >> obzartuchy[i];
cin >> w_pudelku[i];
float *czasy = new float[obzartuchy[i]];
for (int j = 0; j < obzartuchy[i]; j++)
{
cin >> czasy[j];
suma[i] += floor(86400.0 / czasy[j]);
}
delete[] czasy;
}
for (int i = 0; i<proby; i++)
{
int liczba = ceil(suma[i] / w_pudelku[i]);
cout << liczba << endl;
}
delete[] obzartuchy;
delete[] w_pudelku;
delete[] suma;
return 0;
}
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