03 2019 档案
摘要：Given two integers n and k, return all possible combinations of k numbers out of 1 ... n.Example:Input: n = 4, k = 2Output:[ [2,4], ...
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摘要：Given a collection of numbers that might contain duplicates, return all possible unique permutations.Example:Input: [1,1,2]Output:[ [...
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摘要：Given a collection of distinct integers, return all possible permutations.Example:Input: [1,2,3]Output:[ [1,2,3], [1,3,2], [2,1,3],...
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摘要：Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one of the first st...
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