Can anyone help me for this problem?link is here. I get it from there
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Auto comment: topic has been updated by Muhammad_mhs (previous revision, new revision, compare).
It would be better for you as beginner if you focus more on standard data structure and algorithm rather than these high optimization problem, even if you solve or understand editorial of these high optimization problem you won't even think to try these problem in any contest without having good knowledge of data structure & algorithm because these problem are generally Div2-F or Div1-E.
Thanks for your suggestion