代码随想录day37动态规划part05

518. 零钱兑换 II

class Solution {
public:
    int change(int amount, vector<int>& coins) {
        vector<uint64_t> dp(amount + 1, 0);
        dp[0] = 1;
        for (int i = 0; i < coins.size(); i++) {
            for (int j = coins[i]; j <= amount; j++) {
                dp[j] += dp[j - coins[i]];
            }
        }
        return dp[amount];
    }
};

377. 组合总和 Ⅳ

class Solution {
public:
    int combinationSum4(vector<int>& nums, int target) {
        vector<uint64_t> dp(target + 1, 0);
        dp[0] = 1;
        for (int i = 0; i <= target; i++) {
            for (int j = 0; j < nums.size(); j++) {
                if (i >= nums[j]) {
                    dp[i] += dp[i - nums[j]];
                }
            }
        }
        return dp[target];
    }
};