44.Combination Sum IV.cpp

// Problem Description:https://leetcode.com/problems/combination-sum-iv/
class Solution {
public:
    int combinationSum4(vector<int>& nums, int target) {
        vector<unsigned int> dp(target + 1, 0);
        dp[0] = 1;
        for (int i = 1; i <= target; i++)
            for (int j = 0; j < nums.size(); j++)
                if (i - nums[j] >= 0)
                    dp[i] += dp[i - nums[j]];
        return dp[target];
    }
};