Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target. Example: nums = [1, 2, 3] target = 4 The possible combination ways are: (1, 1, 1, 1) (1, 1, 2) (1,…

public class Solution { private int[] dp; public int CombinationSum4(int[] nums, int target) { dp = ]; ; i < dp.Length; i++) { dp[i] = -; } dp[] = ; return helper(nums, target); } private int helper(int[] nums, int target) { ) { return dp[target]; }…

思路: dp. 实现: class Solution { public: int combinationSum4(vector<int>& nums, int target) { ; vector<, ); dp[] = ; vector<int> tmp(nums.begin(), nums.end()); sort(tmp.begin(), tmp.end()); int n = tmp.size(); ; i <= target; i++) { ; tmp…