#206Medium#29 in IBM's list· asked at 4 companies
Combinations
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What we know
Example 1
Input: n = 4, k = 2 Output: [[1,2],[1,3],[1,4],[2,3],[2,4],[3,4]]
Example 2
Input: n = 1, k = 1 Output: [[1]]
Constraints
- •
1 <= n <= 20 - •
1 <= k <= n