***C++ w/data structure*** ***Please keep original files*** What would be the missing functionality in the code and what would be the complexity time for each function that has been added. class Stack { int top; public: int a[MAX]; // Maximum size of Stack Stack() { top = -1; } bool push(int x); int pop(); int peek(); bool isEmpty(); }; bool Stack::push(int x) { *insert code* } int Stack::pop() { *insert code* } int Stack::peek() { *insert code* } bool Stack::isEmpty() { *insert code* }

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