python-leetcode面试题解之第157题用Read4读取N个字符-题解.zip

# The read4 API is already defined for you. # @param buf, a list of characters # @return an integer # def read4(buf): class Solution(object): def read(self, buf, n): """ :type buf: Destination buffer (List[str]) :type n: Maximum number of characters to read (int) :rtype: The number of characters read (int) """ pos, eof = 0, False while not eof and pos < n: buffer = [''] * 4 sz = read4(buffer) if sz < 4: eof = True for i in range(sz): buf[pos + i] = buffer[i] pos += min(n - pos, sz) return pos