Hello cycling video interview

First, the code Sri Lanka

1, take the top k

 

2, reversing a linked list

Second, the interview questions

1, hashmap why the load factor is 0.75

2, hashmap why the use of red-black tree list is greater than 8

3, hashmap why expansion of 2 ^ n

4, hashmap Why is not thread safe

5, mysql index different data structures which implement