LeetCode 157: Read N Characters Given Read4
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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 readsn characters from the file.
Note:
The read
function will only be called once for each test case.
int read(char* buf, int n) { int len = 0; while(n > 0) { // if no length left, ends. int tmp = min(read4(buf), n); n = n - tmp; len = len + tmp; buf += tmp; // buf need to be increased. if(tmp < 4) break; // if tmp < 4, means ending. } return len;}
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