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#include "leetcode.h"
class Solution {
public:
int combinationSum4(vector<int> &nums, int target) {
vector<unsigned int> dp(target + 1, 0);
dp[0] = 1;
for (int i = 0; i < target; i++) {
if (!dp[i])
continue;
for (int num : nums)
if (num + i <= target)
dp[i + num] += dp[i];
}
return dp[target];
}
};
int main() {
Solution obj;
vector<int> nums = {1, 2, 3};
int target = 4;
cout << obj.combinationSum4(nums, target);
}
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