[Leetcode] Read N characters Given Read4 I & II

Read N characters Given Read4

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 are only 3 characters left in the file.

read4by using the API, implement the function that int read(char *buf, int n) reads n characters from the file.

Note:
The function is only being read called once for each test case.

1 //Forward Declaration of the Read4 API.2 intREAD4 (Char*buf);3 4 classSolution {5  Public:6     /**7 * @param buf Destination buffer8 * @param n Maximum number of characters to read9 * @return The number of characters readTen      */ One     intReadChar*buf,intN) { A         Chartmp[4]; -         intIDX =0, Cnt4; -          while(IDX <N) { theCNT4 =READ4 (TMP); -              for(inti =0; I < cnt4 && idx < n; ++i) { -buf[idx++] =Tmp[i]; -             } +             if(Cnt4 <4) Break; -         } +         returnidx; A     } at};

Read N characters Given Read4 ii-call multiple times

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 are only 3 characters left in the file.

read4by using the API, implement the function that int read(char *buf, int n) reads n characters from the file.

Note:
The read function may be called multiple times.

1 //Forward Declaration of the Read4 API.2 intREAD4 (Char*buf);3 4 classSolution {5 Private:6     Chartmp[4];7     intTmp_idx =0, Tmp_len =0;8  Public:9     /**Ten * @param buf Destination buffer One * @param n Maximum number of characters to read A * @return The number of characters read -      */ -     intReadChar*buf,intN) { the         intIDX =0; -         BOOLFlag; -          while(IDX <N) { -Flag =true; +             if(Tmp_idx = =Tmp_len) { -Tmp_idx =0; +Tmp_len =READ4 (TMP); A                 if(Tmp_len! =4) flag =false; at             } -              for(; tmp_idx < Tmp_len && idx < n; + +tmp_idx) { -buf[idx++] =Tmp[tmp_idx]; -             } -             if(!flag) Break; -         } in         returnidx; -     } to};

[Leetcode] Read N characters Given Read4 I & II