LeetCode 25. Reverse Nodes in k-Group

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static auto x = []()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    return 0;
}();
/**
 * Definition for singly-linked list.[......]<p class="read-more"><a href="https://www.gerrytang.top/?p=882">Read more</a></p>