#pragma once

#include <iostream>
#include <string>
#include <stack>

namespace yaha {
class CQueue {
public:
    CQueue() {
    }

    void append_tail(int value);
    int delete_head();

private:
    std::stack<int> _stk_tail;
    std::stack<int> _stk_head;
};

class String {
public:
    std::string replace_space(std::string s);
};

class ListNode {
public:
    int val;
    ListNode *next;
    ListNode(int x) : val(x), next(NULL) {}
    std::vector<int> reverse_print(ListNode *head);
    void reverse(ListNode *head, std::vector<int>& res);
};

}