Combinations LeetCode

Given two integers n and k, return all possible combinations of k numbers out of the range [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

This problem is a medium interview question and is popular in LeetCode A collection of hundreds of interview questions and solutions are available in our blog at Interview Question Solutions