#include <iostream>
#include <math.h>
using namespace std;
int ile;
int n,m,ciastekWCiaguDoby=0,opakowania=0;
int czasO;
float sumaCiastekWCiaguDoby=0;
int main()
{
cin>>ile;
for(int i=0;i<ile;i++)
{
int suma=0;
cin>>n>>m;
for(int s=0;s<n;s++)
{
cin>>czasO;
if(czasO > 86400)
{
opakowania=0;
}else{
ciastekWCiaguDoby=(86400/czasO);
sumaCiastekWCiaguDoby+=ciastekWCiaguDoby;
opakowania =ceil(sumaCiastekWCiaguDoby/m);
}
}
cout<<opakowania;
ciastekWCiaguDoby=0;
suma=0;
opakowania=0;
sumaCiastekWCiaguDoby = 0;
}
return 0;
}
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