求助两道facebook的面试题（大米回报）

LC157 和 follow up LC158
这两道题根本无法理解题目的意思，答案也看不懂。真心求教，有人能详细讲解一下吗？

157. Read N Characters Given Read4
The API: int read4(char *buf) reads 4 characters at a time from a file.
The return value is the actual number of characters read. For example, it returns 3 if there is only 3 characters left in the file.
By using the read4 API, implement the function int read(char *buf, int n) that reads n characters from the file.
Note:
The read function will only be called once for each test case.



158. Read N Characters Given Read4 II - Call multiple times
The API: int read4(char *buf) reads 4 characters at a time from a file.
The return value is the actual number of characters read. For example, it returns 3 if there is only 3 characters left in the file.
By using the read4 API, implement the function int read(char *buf, int n) that reads n characters from the file.
Note:
The read function may be called multiple times.

电面嘛？还是onsite？ new grad  还是experienced ?

zyoppy008 发表于 2016-8-13 07:08
电面嘛？还是onsite？ new grad  还是experienced ?

面经看到的。http://www.1point3acres.com/bbs/thread-199086-1-1.html

https://discuss.leetcode.com/top ... ean-java-solution/2

https://discuss.leetcode.com/top ... epted-java-solution 解释的很好