list数量不多但是每个list里元素特别特别多，要用什么办法 heap
如果priorityqueue里面只剩一个list时候，可以直接merge不用在用PQ处理了
两种解法都必须会
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
public class Solution {
public ListNode mergeKLists(ListNode[] lists) {
return partion(lists,0,lists.length-1);
}
public static ListNode partion(ListNode[] lists,int s,int e){
if(s==e) return lists[s];
if(s<e){
int q=(s+e)/2;
ListNode l1=partion(lists,s,q);
ListNode l2=partion(lists,q+1,e);
return merge(l1,l2);
}else
return null;
}
//This function is from Merge Two Sorted Lists.
public static ListNode merge(ListNode l1,ListNode l2){
if(l1==null) return l2;
if(l2==null) return l1;
if(l1.val<l2.val){
l1.next=merge(l1.next,l2);
return l1;
}else{
l2.next=merge(l1,l2.next);
return l2;
}
}
}
