#2296

Design a Text Editor

candidate master · 1455 · lc hard +32 · 50.1% accepted · 654 likes · top 38%

Description

Design a text editor with a cursor that can:

- Insert text at the current cursor position.

- Delete characters immediately to the left of the cursor.

- Move the cursor left or right.

The cursor stays within the text at all times: 0 <= cursor.position <= currentText.length.

Implement the TextEditor class:

- TextEditor() Creates an editor with empty text.

- void addText(string text) Inserts text at the cursor; cursor ends up to the right of the inserted text.

- int deleteText(int k) Deletes up to k characters to the left; returns the actual number deleted.

- string cursorLeft(int k) Moves cursor left up to k steps; returns up to 10 characters immediately left of the cursor.

- string cursorRight(int k) Moves cursor right up to k steps; returns up to 10 characters immediately left of the cursor.

Example 1:

Input

["TextEditor", "addText", "deleteText", "addText", "cursorRight", "cursorLeft", "deleteText", "cursorLeft", "cursorRight"]

[[], ["leetcode"], [4], ["practice"], [3], [8], [10], [2], [6]]

Output

[null, null, 4, null, "etpractice", "leet", 4, "", "practi"]

Example 2:

Explanation

TextEditor textEditor = new TextEditor(); // The current text is "|". (The '|' character represents the cursor)

textEditor.addText("leetcode"); // The current text is "leetcode|".

textEditor.deleteText(4); // return 4

// The current text is "leet|".

// 4 characters were deleted.

textEditor.addText("practice"); // The current text is "leetpractice|".

textEditor.cursorRight(3); // return "etpractice"

// The current text is "leetpractice|".

// The cursor cannot be moved beyond the actual text and thus did not move.

// "etpractice" is the last 10 characters to the left of the cursor.

textEditor.cursorLeft(8); // return "leet"

// The current text is "leet|practice".

// "leet" is the last min(10, 4) = 4 characters to the left of the cursor.

textEditor.deleteText(10); // return 4

// The current text is "|practice".

// Only 4 characters were deleted.

textEditor.cursorLeft(2); // return ""

// The current text is "|practice".

// The cursor cannot be moved beyond the actual text and thus did not move.

// "" is the last min(10, 0) = 0 characters to the left of the cursor.

textEditor.cursorRight(6); // return "practi"

// The current text is "practi|ce".

// "practi" is the last min(10, 6) = 6 characters to the left of the cursor.

Code

class TextEditor:

    def __init__(self):
        

    def addText(self, text: str) -> None:
        

    def deleteText(self, k: int) -> int:
        

    def cursorLeft(self, k: int) -> str:
        

    def cursorRight(self, k: int) -> str:
        


# Your TextEditor object will be instantiated and called as such:
# obj = TextEditor()
# obj.addText(text)
# param_2 = obj.deleteText(k)
# param_3 = obj.cursorLeft(k)
# param_4 = obj.cursorRight(k)

class TextEditor:

    def __init__(self):
        

    def addText(self, text: str) -> None:
        

    def deleteText(self, k: int) -> int:
        

    def cursorLeft(self, k: int) -> str:
        

    def cursorRight(self, k: int) -> str:
        


# Your TextEditor object will be instantiated and called as such:
# obj = TextEditor()
# obj.addText(text)
# param_2 = obj.deleteText(k)
# param_3 = obj.cursorLeft(k)
# param_4 = obj.cursorRight(k)