Problem link
I could not think of any approach but just am getting an intuition of using DSU in reverse or querying offline but I can't think of anything. Someone please help.
I just need an approach not complete code.:)
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Offline approach combined with applying DSU in reverse order would world fine.
can see this blog, it has the same problem.
May crop out the URL. The URL in the image leads to reveal email and phone of the person.