Given a file and assume that you can only read the file using a given method read4, implement a method read to read n characters. Your method read may be called multiple times. Method read4: The API read4 reads 4 consecutive characters from the file, then writes those characters into the buffer array buf. The return value is the number of actual characters read. Note that read4() has its own file pointer, much like FILE *fp in C.
Design a class to find the kth largest element in a stream. Note that it is the kth largest element in the sorted order, not the kth distinct element. Your KthLargest class will have a constructor which accepts an integer k and an integer array nums, which contains initial elements from the stream. For each call to the method KthLargest.add, return the element representing the kth largest element in the stream.
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 reads n characters from the file. Example 1 Input: buf = "abc", n = 4 Output: "abc" Explanation: The actual number of characters read is 3, which is "abc".