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  1. Practice
  2. Data Structures
  3. Stacks
  4. Simple Text Editor
  5. Discussions

Simple Text Editor

  • aishik_swarez + 2 comments

    import java.io.; import java.util.;

    public class Solution {

    public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    int n = Integer.parseInt(br.readLine());
    String outputString = "";
    Stack<String> stack = new Stack<>();
    stack.push(outputString);
    List<Character> result = new ArrayList<>();
    for (int i = 0; i < n; i++) {
        String append = null;
        int show = 0;
        int del = 0;
        String inp = br.readLine();
        String arr[] = inp.split(" ");
        int opt = Integer.parseInt(arr[0]);
        switch (opt) {
        case 1:
            append = arr[1];
            outputString += append;
            stack.push(outputString);
            break;
        case 2:
            del = Integer.parseInt(arr[1]);
            outputString = outputString.substring(0, outputString.length() - del);
            stack.push(outputString);
            break;
        case 3:
            show = Integer.parseInt(arr[1]);
            result.add(outputString.charAt(show - 1));
            break;
        case 4:
            stack.pop();
            outputString = stack.peek();
        }
    }
    try {
        for(Character j:result)
            System.out.println(j);
    } catch (Exception e) {

    }
}

    }

    • kapploneon + 0 comments

      How about using StringBuilder?

    • bharath390 + 0 comments

      /*Can some one suggest whats the mistake I made */

      import java.io.; import java.util.;

      public class Solution {

       private static final Scanner scanner = new Scanner(System.in);
public static void main(String[] args) {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */

     int q = scanner.nextInt();
      StringBuilder sb = new StringBuilder();
      Stack st = new Stack();
     for(int i=0; i< q; i++){
         int oprn = scanner.nextInt();
        switch(oprn){
         case 1 : {
             String W = scanner.next();
             st.push(sb.toString());
             sb.append(W);
             break;
         }case 2 : {
             st.push(sb.toString());
             int k = scanner.nextInt();
             st.push(sb.toString());
             sb.delete(sb.length() - k, k);
             break;
         }case 3 :{
             int p = scanner.nextInt();
             System.out.println(sb.toString().charAt(p-1));
             break;
         }case 4 :{
              sb.delete(0, sb.length());
              sb.append(st.pop());
              break;
         }

        }
     }
}

      }