#3531

Count Covered Buildings

specialist · 740 · lc medium +31 · 58.7% accepted · 440 likes · top 55%

Description

An n x n city grid has buildings at positions given by buildings[i] = [x, y]. A building is "covered" when at least one other building exists in each of the four cardinal directions (left, right, above, below) relative to it.

Return the total number of covered buildings.

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