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26. Remove Duplicates from Sorted Array Easy descrition Given a sorted array, remove the duplicates in place such that each element appear only once a 阅读全文
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18. 4Sum Medium descrition Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique qu 阅读全文
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leetCode 15. 3Sum Medium descrition Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets 阅读全文
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16. 3Sum Closest Medium descrition Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Re 阅读全文