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组合 #23

Description

@Mooo-star

给定两个整数 n 和 k,返回范围 [1, n] 中所有可能的 k 个数的组合。

你可以按 任何顺序 返回答案。

示例 1:

输入:n = 4, k = 2
输出:
[
[2,4],
[3,4],
[2,3],
[1,2],
[1,3],
[1,4],
]

示例 2:

输入:n = 1, k = 1
输出:[[1]]

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