Leetcode日记:77.组合
Leetcode日记:77.组合,回溯问题的优化问题Given two integers n and k, return all possible combinations of k numbers out of 1 … n.
Example:
12345678910Input: n = 4, k = 2Output:[ [2,4], [3,4], [2,3], [1,2], [1...
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