B : seq
Diff : Easy->V-Hard(2->7)
Comment :
When I see it : Yeah…..?
When I see "n<=200000" : HUH???!
Later : Give up now. O(n^2) is the best I can get.
Distance to submitting ~5 minutes : Test.50 is OK.
When I see the answer is wrong : OH, NO.Correct it now!
Later : Give up now. This is the best I can do.
Final : 40/100