#pragma GCC optimize("O3", "unroll-loops")
auto init = []()
{
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
return 'c';
}();
https://leetcode.com/problems/leaf-similar-trees/solutions/4532722/c-dfs-recursion-vs-iteration-0ms-beats100/
https://codeforces.com/blog/entry/10
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