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Homely Hummingbird answered on November 7, 2023 Popularity 1/10 Helpfulness 1/10

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answer memoize the solution

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memoize the solution

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class Solution {
public:
    bool isSubsetSum(vector<int>& arr, int sum) {
        int n = arr.size();
        vector<vector<int>> memo(n, vector<int>(sum + 1, -1));
        return helper(0, sum, arr, memo);
    }

    bool helper(int idx, int sum, vector<int>& arr, vector<vector<int>>& memo) {
        if (sum == 0) {
            return true;
        }
        if (idx >= arr.size() || sum < 0) {
            return false;
        }

        if (memo[idx][sum] != -1) {
            return memo[idx][sum] == 1;
        }

        bool include = helper(idx + 1, sum - arr[idx], arr, memo);
        bool exclude = helper(idx + 1, sum, arr, memo);

        memo[idx][sum] = include || exclude ? 1 : 0;
        return memo[idx][sum] == 1;
    }
};

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Tags: c++ solution

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Homely Hummingbird

Contributed on Nov 07 2023

Homely Hummingbird

0 Answers Avg Quality 2/10

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