problem77

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Published: Mar 23, 2021 License: MIT Imports: 0 Imported by: 0

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77. Combinations (Medium)

Given two integers n and k, return all possible combinations of k numbers out of 1 ... n.

You may return the answer in any order.

 

Example 1:

Input: n = 4, k = 2
Output:
[
  [2,4],
  [3,4],
  [2,3],
  [1,2],
  [1,3],
  [1,4],
]

Example 2:

Input: n = 1, k = 1
Output: [[1]]

 

Constraints:

  • 1 <= n <= 20
  • 1 <= k <= n

[Backtracking]

Similar Questions

  1. Combination Sum (Medium)
  2. Permutations (Medium)

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