Help in 2nd problem of lunchtime

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Can anyone tell me where this solution for 2nd problem is going wrong? CodeChef: Practical coding for everyone
p.s.- Its my friend’s code and he asked me to debug it after contest but i failed too

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@soham1234. Why are you directly updating on index x%b where you have actually sorted the vector and messed up the data and the actual element may be somewhere else. I may be wrong again. Please verify.

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Could Someone Please tell me why this particular solution is giving a wrong answer for the same problem?
https://www.codechef.com/viewsolution/16374812
i tried several methods but my answer was never accepted completely.Could Someone tell me the input for which it gives the wrong answer.??
Help of any kind would be highly appreciated.

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Can anyone tell me why my solution is giving wrong answer on subtask #2 but correct answer on subtasks #1 and #3. CodeChef: Practical coding for everyone

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n=1e5 for a particular testcase

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@soham1234 Sorry my problem. Updated answer.

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@aayushkapadia Can you please explain how to solve L-R queries?

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Your product in num is overflowing. Use long long.