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[Question] Square root within mod
Hello codeforces,
Today, I am regretably in math class with the subject of modular arithmetic. While thinking about a problem, I reminded myself of a question I asked myself some time ago.
Given $$$p$$$ and $$$mod$$$, find a $$$q$$$ such that $$$q^2$$$ = $$$p$$$ (modulo $$$mod$$$). $$$mod$$$ is prime and ≫ $$$10^8$$$
Does this admit an online logarithmic-complexity solution?
