cpp-problems/Leetcode 255.cpp at main · Hritik003/cpp-problems · GitHub

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class MyStack {
public:
    queue<int> q1;
    queue<int> q2;

    MyStack() {

    }

    void push(int x) {

        while(!q1.empty())
        {
            q2.push(q1.front());
            q1.pop();
        }
        q1.push(x);
         while(!q2.empty())
        {
            q1.push(q2.front());
            q2.pop();
        }


    }

    int pop() {
        int top = q1.front();
        q1.pop();
        return top;

    }

    int top() {
       return q1.front();

    }

    bool empty() {
        return q1.empty();

    }
};

/**
 * Your MyStack object will be instantiated and called as such:
 * MyStack* obj = new MyStack();
 * obj->push(x);
 * int param_2 = obj->pop();
 * int param_3 = obj->top();
 * bool param_4 = obj->empty();
 */