Leetcode Problem 631. Design Excel Sum Formula

631. Design Excel Sum Formula

Leetcode Solutions

Initialize an Excel class with a 2D array representing the cells.
Implement a set method to update a cell's value and trigger updates to dependent cells using topological sort.
Implement a get method to retrieve the value of a cell.
Implement a sum method to set a cell's value based on the sum of other cells or ranges, update the DAG, and perform a topological sort to update dependents.
Use a helper method to convert string ranges into actual cell references.
Use a helper method to calculate the sum of cells for the sum method.
Use a helper method to perform topological sorting and update cell values accordingly.

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