223. Rectangle Area

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2240. Number of Ways to Buy Pens and Pencils

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2241. Design an ATM Machine

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2243. Calculate Digit Sum of a String

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2244. Minimum Rounds to Complete All Tasks

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2248. Intersection of Multiple Arrays

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2249. Count Lattice Points Inside a Circle

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224. Basic Calculator

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2250. Count Number of Rectangles Containing Each Point

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2251. Number of Flowers in Full Bloom

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