Leetcode Problem 158. Read N Characters Given read4 II - Call Multiple Times

158. Read N Characters Given read4 II - Call Multiple Times

Leetcode Solutions

Buffered Read with Internal State Management

  1. Initialize buffPtr to 0 and buffCnt to 0. These will keep track of the current position in the internal buffer and the count of characters in the buffer, respectively.
  2. Initialize an internal buffer buff of size 4.
  3. When read is called with buf and n, initialize a pointer ptr to 0 to track the number of characters copied to buf.
  4. While ptr < n, perform the following steps: a. If buffPtr is 0, call read4(buff) to read characters into the internal buffer and update buffCnt with the number of characters read. b. If buffCnt is 0, break the loop as there are no more characters to read. c. While ptr < n and buffPtr < buffCnt, copy characters from buff to buf and increment both ptr and buffPtr. d. If buffPtr reaches buffCnt, reset buffPtr to 0 to indicate that the internal buffer is consumed and needs to be refilled on the next iteration.
  5. Return ptr as the number of characters read into buf.
UML Thumbnail

Queue-based Buffered Read

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