public static void Merge(StreamReader[] streams)
{
int N = streams.Length;
IndexPriorityQueue <string> pq = new IndexPriorityQueue <string>(N);//最大堆，从大到小排序
for (int i = 0; i < N; ++i)
{
if (!streams[i].EndOfStream)
{
pq.Insert(i, streams[i].ReadLine());//i是保存的元素的流在数组的索引
}
}
while (!pq.IsEmpty())
{
Console.WriteLine(pq.Min());
int i = pq.DeleteMin();
if (!streams[i].EndOfStream)
{
pq.Insert(i, streams[i].ReadLine());//替换为新的值
}
}
}
