aklepatc

Design and implement a simplified spreadsheet. Spreadsheet consists of cells. Every cell has a string id. All ids are valid so there is no need to validate them. A cell contains an integer value or a formula like "=A1+B1". You can assume that all formulas are valid and "+" is the only operation that needs to be supported.

What is wrong and what is very wrong with my original solution?
https://go.dev/play/p/v0SXCGdaQsu

JIC: this is not meant to be language-specific. If you at least can read my Go then you are all set.