Combination Sum IV Given an array of distinct integers nums
and a target integer target
, return the number of possible combinations that add up to target
.
The test cases are generated so that the answer can fit in a 32-bit integer.
Example 1:
Input: nums = [1,2,3], target = 4 Output: 7 Explanation: The possible combination ways are: (1, 1, 1, 1) (1, 1, 2) (1, 2, 1) (1, 3) (2, 1, 1) (2, 2) (3, 1) Note that different sequences are counted as different combinations.
Example 2:
Input: nums = [9], target = 3 Output: 0
Constraints:
1 <= nums.length <= 200
1 <= nums[i] <= 1000
- All the elements of
nums
are unique. 1 <= target <= 1000
Combination Sum IV Solutions
✅Time: O(n)
✅Space: O(n)
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