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- import java.util.ArrayDeque;
- import java.util.Scanner;
- public class SimpleTextEditor {
- public static void main(String[] args) {
- Scanner scanner = new Scanner(System.in);
- int n = Integer.parseInt(scanner.nextLine());
- ArrayDeque<String> stack = new ArrayDeque<>();
- for (int i = 0; i < n ; i++) {
- String [] token = scanner.nextLine().split(" ");
- switch (token[0]){
- case "1":
- stack.push(token[1]);
- break;
- case "2":
- stack.push(stack.peek().substring(0, stack.peek().length() - Integer.parseInt(token[1])));
- break;
- case "3":
- System.out.println(stack.peek().charAt(Integer.parseInt(token[1]) - 1));
- break;
- case "4":
- stack.pop();
- break;
- }
- }
- }
- }
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