CF 106508E - Phantoms of the XOR Tree

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Solution

Got it.

Please send the full problem statement (or link/text, constraints, and any samples). Once I have that, I’ll write a proper Codeforces-style editorial with:

Intuition / key observation
Step-by-step solution
Correctness argument
Complexity analysis
Edge cases
Clean implementation outline (and code if you want)

If it’s multiple parts or interactive, include those details too.