7 Lines - C++ 0ms

  • 0
    int read(char *buf, int n) {
        int ans = 0, cur_char_read = 0;
        while(n > 0 && (cur_char_read = read4(buf)) > 0) {
            ans += min(n, cur_char_read);
            n -= cur_char_read;
            buf += cur_char_read;
        return ans;

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    This answer is not 100% correct in the sense that it may cause overwrite in buf. Consider the situation that the file has 8 chars but the read is called with n=3. In this case, we should never call read4() on buf directly because that will overwrite 1 byte after the allocated space of buf, which has only 3 . The correct way to handle this is to read into a temporary buffer when there is risk for buf overwrite.

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