LeetCode 377: Combination Sum IV
Problem Restatement We are given an array of distinct positive integers nums and an integer target . We need to count how many possible ordered combinations can add up to target . Each number in nums can be used multiple times. Order matters. That means these are counted as different combinations: [1, 2, 1] [2, 1, 1] [1, 1, 2] Even though they use the same numbers, their order is...