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  2. Data Structures
  3. Stacks
  4. Simple Text Editor
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Simple Text Editor

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  • pradeep_tarakar
     + 0 comments

    My C++ Solution:

    int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int q=0;
    cin >> q;
    string s ="";
    stack<string> v;
    v.push(s);
    for(int i=0; i<q; i++){
        int op = 0;string ss;
        cin >> op;
        if(op != 4)cin >> ss;
        switch (op) {
            case 1:
               s+=ss;
               v.push(s);
               break;
            case 2:
                s = s.substr(0, s.length() - stoi(ss));
                v.push(s);
                break;
             case 3:
                cout << v.top()[stoi(ss)-1]<<endl;
                break;
            case 4:
                v.pop();
                s = v.top();
                break;
        }
    }
    
    return 0;
}

  • CS_2212256_T
     + 0 comments
    import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
      
        Scanner sc = new Scanner(System.in);
        String str = "";
        int top = 0;
        int q = Integer.parseInt(sc.nextLine());
        MyStack stack = new MyStack(q);
        for(int i = 0; i < q; ++i){
            String st[] = sc.nextLine().split(" ");
            int query = Integer.parseInt(st[0]);
            if(query == 1){
                Node newNode = new Node(query,str.length());
                stack.top++;
                stack.list[stack.top] = newNode;
                str += st[1];
            } else if(query == 2){
                int k = Integer.parseInt(st[1]);
                Node newNode = new Node(query,str.substring(str.length()-k));
                stack.top++;
                stack.list[stack.top] = newNode;
                str = str.substring(0,str.length()-k);
            } else if(query == 3){
                int index = Integer.parseInt(st[1]);
                System.out.println(str.charAt(index-1));
            } else if(query == 4){
                Node newNode = stack.list[stack.top];
                stack.top--;
                if(newNode.qtype == 1){
                    str = str.substring(0,newNode.idx);
                } else if(newNode.qtype == 2){
                    str += newNode.w;
                }
            }
        }
    }
}
class MyStack{
    Node list[];
    int top;
    MyStack(int size){
        this.list = new Node[size];
        this.top = -1;
    }
}
class Node{
    int qtype;
    int idx;
    String w;
    Node(int x, String y){
        this.qtype = x;
        this.w = y;
    }
    Node(int x, int index){
        this.qtype = x;
        this.idx = index;
    }
}

  • vicknessh
     + 0 comments

    C++

    include

    include

    include

    include

    include

    include

    using namespace std;

    static stack sString{}; void append(string &s,string appStr){ sString.push(s); s=s+appStr; //cout<<"Appended: "<

    void del( int k, string &s){ sString.push(s); if(s.size()-k >=0) s.erase(s.size()-k,k); //cout<<"Deleted: "<

    void print(int k,const string &s){ cout << s[k-1]<

    void undo(string &s){

    s=sString.top();
sString.pop();
//cout<<"After Undo: "<<s<<endl;

    }

    vector splitString(string s,string delimiter) { vector out{}; int start=0; int end=s.find(delimiter,start); while(end!=string::npos) { out.push_back(s.substr(start,end-start)); start=end+delimiter.length(); end=s.find(delimiter,start); } out.push_back(s.substr(start)); return out; }

    int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    int q; cin>>q; string out{}; while (q>=0) { string s; getline(cin,s); vector split = splitString(s, " ");

        if(split[0]=="1")
    {
        append(out, split[1]);
    }
    else if(split[0]=="2")
    {
        del(stoi(split[1]), out);
    }
    else if(split[0]=="3")
    {
        print(stoi(split[1]), out);
    }
    else if(split[0]=="4")
    {
        undo(out);
    }
    q--;
}    
return 0;

    }

  • vicknessh
     + 0 comments

    C++

    include

    include

    include

    include

    include

    include

    using namespace std;

    static stack sString{}; void append(string &s,string appStr){ sString.push(s); s=s+appStr; //cout<<"Appended: "<

    void del( int k, string &s){ sString.push(s); if(s.size()-k >=0) s.erase(s.size()-k,k); //cout<<"Deleted: "<

    void print(int k,const string &s){ cout << s[k-1]<

    void undo(string &s){

    s=sString.top();
sString.pop();
//cout<<"After Undo: "<<s<<endl;

    }

    vector splitString(string s,string delimiter) { vector out{}; int start=0; int end=s.find(delimiter,start); while(end!=string::npos) { out.push_back(s.substr(start,end-start)); start=end+delimiter.length(); end=s.find(delimiter,start); } out.push_back(s.substr(start)); return out; }

    int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    int q; cin>>q; string out{}; while (q>=0) { string s; getline(cin,s); vector split = splitString(s, " ");

        if(split[0]=="1")
    {
        append(out, split[1]);
    }
    else if(split[0]=="2")
    {
        del(stoi(split[1]), out);
    }
    else if(split[0]=="3")
    {
        print(stoi(split[1]), out);
    }
    else if(split[0]=="4")
    {
        undo(out);
    }
    q--;
}    
return 0;

    }

  • yoav0gal
     + 0 comments

    typescript boilerplate: 'use strict';

    process.stdin.resume(); process.stdin.setEncoding('utf-8'); let inputString: string = ''; let inputLines: string[] = []; let currentLine: number = 0; process.stdin.on('data', function(inputStdin: string): void { inputString += inputStdin; });

    process.stdin.on('end', function(): void { inputLines = inputString.split('\n'); inputString = ''; main(); });

    function readLine(): string { return inputLines[currentLine++]; }

    class TextEditor { private currentText:string; // Enter your code here constructor(){ this.currentText ="" } append(w:string){ // Enter your code here } delete(k:number){ // Enter your code here } print(k:number){ // Enter your code here } undo(){ // Enter your code here } }

    type EditorMethod = "append" | "delete" | "print" | "undo";

    function main() { const commandMap = {"1": "append", "2": "delete", "3" : "print", "4": "undo" } as const;

    const textEditor = new TextEditor();
inputLines.shift()
inputLines.map((inputLine:string) => {
    const [command, input] = inputLine.split(" ") as ["1"|"2"|"3"|"4", string]
    const method = commandMap[command] 
    if (method == "undo") return textEditor.undo()
    if (method == "append") return textEditor.append(input);

    return textEditor[method](Number(input))
} );

    }