20. Write an object-oriented program with constructor, default constructor, copy constructor and destructor to read a set of lines from stdin and store them in an array A; again read a string S from...

20. Write an object-oriented program with constructor, default constructor, copy constructor and

destructor to read a set of lines from stdin and store them in an array A; again read a string S from the stdin and check whether the given string S is in the array A. If it is, print that line and also how many times it has been repeated in the array A.

21. Write an object-oriented program with constructor, default constructor, copy constructor and

destructor to read a set of lines from stdin and store them in an array A; again read a string S from the stdin and check whether the given string S is in the array A. If it is, remove the string S from the array A and print the updated array on the stdout. For example,

A = concatenate S = cat

The updated a is conenate