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  1. #include <iostream>
  2. #include <stack>
  3. #include <string>
  4.  
  5. using namespace std;
  6.  
  7. class TextEditor {
  8. private:
  9.     stack<string> undoStack;
  10.     stack<string> redoStack;
  11.     string text;
  12.  
  13. public:
  14.     void write(const string& newText) {
  15.         undoStack.push(text);  // Save current state before modification
  16.         text = newText;
  17.         while (!redoStack.empty()) redoStack.pop();  // Clear redo stack
  18.     }
  19.  
  20.     void undo() {
  21.         if (!undoStack.empty()) {
  22.             redoStack.push(text);  // Save current state for redo
  23.             text = undoStack.top();  // Restore previous state
  24.             undoStack.pop();
  25.         } else {
  26.             cout << "Nothing to undo!\n";
  27.         }
  28.     }
  29.  
  30.     void redo() {
  31.         if (!redoStack.empty()) {
  32.             undoStack.push(text);  // Save current state for undo
  33.             text = redoStack.top();  // Restore undone state
  34.             redoStack.pop();
  35.         } else {
  36.             cout << "Nothing to redo!\n";
  37.         }
  38.     }
  39.  
  40.     void display() {
  41.         cout << "Current Text: " << text << endl;
  42.     }
  43. };
  44.  
  45. int main() {
  46.     TextEditor editor;
  47.     editor.write("Hello");
  48.     editor.display();
  49.  
  50.     editor.write("Hello World");
  51.     editor.display();
  52.  
  53.     editor.undo();
  54.     editor.display();
  55.  
  56.     editor.redo();
  57.     editor.display();
  58.  
  59.     return 0;
  60. }
  61.  
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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Current Text: Hello
Current Text: Hello World
Current Text: Hello
Current Text: Hello World
https://ideone.com/L5db3u
language:
C++ (gcc 8.3)
created:
280 days ago
visibility:
public

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