Example 1:
Input: ["Excel", "set", "sum", "set", "get"]
[[3, "C"], [1, "A", 2], [3, "C", ["A1", "A1:B2"]], [2, "B", 2], [3, "C"]]
Output: [null, null, 4, null, 6]
Explanation:
Design the basic functionality of an Excel-like spreadsheet.
Implement the Excel class:
Excel(int height, char width) Initializes a spreadsheet with height rows and columns from A through width.void set(int row, char column, int val) Sets cell (row, column) to val, replacing any formula that was previously stored in the cell.int get(int row, char column) Returns the current value of cell (row, column).int sum(int row, char column, List<String> numbers) Stores a formula in cell (row, column) and returns the formula value. Each string in numbers is either a single cell such as "A1" or a rectangular range such as "A1:B2".When a formula references other cells, it must reflect later updates to those cells. You may assume the input does not create circular dependencies.
The formula in C3 counts A1 once directly and once through the range A1:B2. Updating B2 later changes the formula result from 4 to 6.
1 <= height <= 26A <= width <= Z1 <= row <= heightA <= column <= width-100 <= val <= 1001 <= numbers.length <= 5100 calls will be made to set, get, and sum.