Array Problem in C++ how to store value is array if user continuously change size of array [closed]

case 1: user enter this 2 2 case 2: user enter this 3 1 5 4 case 3: user enter this 5 1 2 8 9 3 we have to store this value in array and display it, how to solve this problem, because we don't know size of array and also user continuously change size of array.