2201. Count Artifacts That Can Be Extracted

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2202. Maximize the Topmost Element After K Moves

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2206. Divide Array Into Equal Pairs

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2207. Maximize Number of Subsequences in a String

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2208. Minimum Operations to Halve Array Sum

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2210. Count Hills and Valleys in an Array

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2211. Count Collisions on a Road

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2212. Maximum Points in an Archery Competition

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221. Maximal Square

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2220. Minimum Bit Flips to Convert Number

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