Read N Characters Given Read4

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Easy•os-flavor•Expected: O(n) time, O(1) space

Problem

Given a method read4 that reads 4 characters at a time, implement read(buf, n) that reads n characters from a file.

Example 1:

Input: file = "abc", n = 4
Output: 3
Explanation: After calling read4, "abc" is read. Since only 3 characters exist, read returns 3.

Example 2:

Input: file = "abcde", n = 5
Output: 5
Explanation: read4 returns "abcd" first, then "e". Total 5 characters read.

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