Direct i question help

Revision en2, by aman_naughty, 2019-10-15 08:48:42

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.:)

Tags #interview, directi, #help, #tree

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en2 English aman_naughty 2019-10-15 08:48:42 71
en1 English aman_naughty 2019-10-15 08:45:18 278 Initial revision (published)