Updating doc of fenwick tree
Updating doc of fenwick tree

allwinsr/interview,chinmayakelkar/interview,cvasani/interview,hackerFarmaan/interview,rootmonty/interview,rtkasodariya/interview,prabasn/interview,nadeembhati/interview,rtkasodariya/interview,mission-peace/interview,welcomenilesh/interview,harshul1610/interview,UseOnly/interview,mission-peace/interview,saibimajdi/interview,lsingal/interview,manish211/interview-1,mission-peace/interview,mdtareque/interview,Shekharrajak/interview,Shekharrajak/interview,TheKingSlayer/interview,aman-iitj/interview,priyatransbit/interview,onlymilap/interview,Chrisgcy/interview,pankajbhanu/interview,kumargauravtiwary/interview,sazibislam/codeAlgorithom,saviaga/interview,sonamsh/interview,chiranjeevjain/interview