queue_using_stacks.cpp

//Submission Link: https://leetcode.com/problems/min-stack/submissions/1904919818/

class MyQueue {
public:
    stack<int> in, out;
    MyQueue() {
        
    }
    
    void push(int x) {
        in.push(x);
    }
    
    int pop() {
        if(out.empty()){
            while(!in.empty()){
                out.push(in.top());
                in.pop();
            }
        }
        int tp = out.top();
        out.pop();
        return tp;
    }
    
    int peek() {
        if(out.empty()){
            while(!in.empty()){
                out.push(in.top());
                in.pop();
            }
        }
        return out.top();
    }
    
    bool empty() {
        return (out.empty() and in.empty());
    }
};

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