class MyQueue {
public:
stack<int> stkIn, stkOut;
MyQueue() {
}
void push(int x) {
stkIn.push(x);
}
int pop() {
// Import data from stIn only if stOut is empty (import all stIn data)
if (stkOut.empty()) {
while (!stkIn.empty()) {
stkOut.push(stkIn.top());
stkIn.pop();
}
}
int result = stkOut.top();
stkOut.pop();
return result;
}
int peek() {
int result = this->pop();
// Because the pop function pops the element "result",
// it need to be added back again
stkOut.push(result);
return result;
}
bool empty() {
return stkIn.empty() && stkOut.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();
*/