Design a class named Sequence to support several operators.The class contains:0、A no-arg constructor that creates a default Sequence.1、A function named size(),return the number of the element in the sequence.2、A function named empty(), return whether the sequence has no element.3、A function named find(int value) that return whether the value is in the sequence.4、A function named at(int k), return the reference of the k-th element in the sequence. 0 <= k <= size()-1.5、A function named front(), return the first element in the sequence.6、A function named back(), return the last element in the sequence.7、A function named insert(int value), insert an int value to
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