test

this is a test

class Solution {
public:
    vector<vector<string>> groupAnagrams(vector<string>& strs) {
        vector<int> v1 ={3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103};
        unordered_map<unsigned long long, vector<string>> m1;
        for(auto it: strs)
        {
            unsigned long long temp = 1;
            for(auto ch:it)
            {
                temp*=v1[ch-'a'];
            }
            m1[temp].emplace_back(it);
        }
        vector<vector<string>> ans;
        for(auto &[x,y]: m1)
        {
            ans.emplace_back(y);
        }
        return ans;
    }
};

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title

需要折叠的一段内容，支持 markdown

$Fitness = 1/3 [σ(\Delta loss) + σ(\Delta benchmark) + LLMjudge]$

$E=mc^2$

$\frac{\partial L}{\partial W_{xh}} = \underbrace{\frac{\partial L}{\partial y_2} \frac{\partial y_2}{\partial h_2} \frac{\partial h_2}{\partial W_{xh}}}_{\text{第2步的直接贡献}} + \underbrace{\frac{\partial L}{\partial y_2} \frac{\partial y_2}{\partial h_2} \frac{\partial h_2}{\partial h_1} \frac{\partial h_1}{\partial W_{xh}}}_{\text{倒推回第1步的间接贡献}}$