[백준,c++] 1406번 - 에디터

1406번: 에디터

#include <iostream>
#include <stack>

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    string s; cin >> s;
    int t; cin >> t;

    stack<char>left, right;

    for (int i = 0; i < s.length(); i++) {
        left.push(s[i]);
    }

    while (t--) {

        char com; cin >> com;

        if (com == 'L') {
            if (left.empty()) continue;
            right.push(left.top());
            left.pop();
        }
        else if (com == 'D') {
            if (right.empty()) continue;
            left.push(right.top());
            right.pop();
        }
        else if (com == 'B') {
            if (!left.empty()) left.pop();
        }
        else if (com == 'P') {
            char c; cin >> c;
            left.push(c);
        }

    }
    while (!left.empty()) {
        right.push(left.top());
        left.pop();
    }

    while (!right.empty()) {
        cout << right.top();
        right.pop();
    }

}