2191. Sort the Jumbled Numbers

class Solution {
public:
    vector<int> sortJumbled(vector<int>& mapping, vector<int>& nums)
    {
        vector<pair<int, int>> m;

        for (int i = 0; i < nums.size(); ++i)
        {
            string number = to_string(nums[i]);
            string formed = "";
            for (int j = 0; j < number.size(); ++j)
            {
                formed = formed + (to_string(mapping[number[j] - '0']));
            }
            int mappedValue = stoi(formed);
            m.push_back({mappedValue, i});
        }

        sort(m.begin(), m.end());

        vector<int> res;

        for (auto pair : m)
        {
            res.push_back(nums[pair.second]);
        }
        return res;
    }
};

• T: $O(N \cdot \log N)$
• S: $O(N)$