leetcode 2019/03/27

Leetcode 打卡 2019/03/27
还是需要每天保持做题手感，看看自己能不能坚持下来。
今天开始是priority queue专题练习:

• K Closest Points to Origin
• Heap Offer Operation
• K Smallest in unsorted Array
• Kth Largest Element in an Array
• Top K Frequent Words