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"] 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.