Opendoor Phone Interview

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Today we're going to build a basic spreadsheet application like Google sheets or Excel but much simpler. Our spreadsheet, let's call it OpenSheet, will only support cells which hold either integers or formulas that sum two cells.

You are tasked with writing a program that handles this functionality for OpenSheet. You can make any decisions you want regarding how this program is organized, but there must be some sort of

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considerably higher amounts of value reading than value setting, which means our application needs to be optimized for reading in order to give our users the best experience possible. Given this constraint how can we optimize this implementation to improve performance?
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