Design Excel Sum Formula
Now let's add formulas! Make a cell show the sum of other cells. sum(row, col, ["A1", "B1"]) sets a formula that adds those cells. get() on that cell returns the computed sum. If a referenced cell changes, the sum auto-updates. Example: set(1, "A", 5); set(1, "B", 3) sum(1, "C", ["A1", "B1"]) -> C1 = A1 + B1 get(1, "C") -> returns 8
Under the hood, Design Excel Sum Formula is about traversing relationships without getting trapped in cycles. It's a hard one for a reason: it stresses modeling relationships when the rules pile up. If you can explain your visited policy, you're already ahead of most candidates.
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