[실2] 1406 - 에디터

#include <iostream>
#include <functional>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <list>
using namespace std;
 
list<char> my_list;
auto iter = my_list.end();
int count = 0;
 
void Move_left()
{
    if (iter != my_list.begin())
       iter--;
}
 
void Move_right()
{
    if (iter != my_list.end())
        iter++;
}
 
void Delete()
{
    if (iter == my_list.begin())
        return;
 
    iter = my_list.erase(--iter);
}
 
void Add(char _letter)
{
    my_list.insert(iter, _letter);
}
 
int main()
{
    string str;
    char command = '\0', letter = '\0';
    cin >> str;
    my_list = list<char>(str.begin(), str.end());
    iter = my_list.end();
    int num = 0;
    cin >> num;
 
    while(num--)
    {
        cin >> command;
 
        switch(command)
        {
        case 'L': Move_left();  break;
        case 'D': Move_right(); break;
        case 'B': Delete();     break;
        case 'P': 
            cin >> letter;
            Add(letter);  
            break;
        }
    }
    for (const auto& item : my_list)
         cout << item;
 
    return 0;
}