public static long MinWaitTime(string[] queries)
{
long n = queries.Length;
long sum = 0;
var arrvList = new MinHeap <Cust>(); // ordered in arrTime
var waitList = new MinHeap <Cust1>(); // ordered on cookTime
foreach (var q in queries)
{
string[] s = q.Split(' ');
arrvList.Add(new Cust {
arrTime = long.Parse(s[0]), cookTime = long.Parse(s[1])
});
}
var c0 = arrvList.PopMin();
waitList.Add(new Cust1(c0));
long time = c0.arrTime;
while (waitList.GetSize() > 0)
{
var curr = waitList.PopMin();
time = time + curr.cookTime;
while (arrvList.GetSize() > 0 && arrvList.GetMin().arrTime <= time)
{
waitList.Add(new Cust1(arrvList.PopMin()));
}
sum += (time - curr.arrTime);
if (waitList.GetSize() < 1 && arrvList.GetSize() > 0)
{
waitList.Add(new Cust1(arrvList.PopMin()));
}
}
return(sum / n);
}