why u have started itr with 1 in all other examples u start I with 0 . so wts the reason .
Regaridng the bubble sort
Hey @ssmit_joshi 
,
It’s not compulsory to start I with 1 , you can even start your for loop from 0. The reason why in video I started from 1 is to reduce only one iteration I.e., O(1) which can be ignored easily. Hope this helped you understanding
Still if you have problem in understanding, you can have a look at my code here : https://ide.codingblocks.com/s/330275
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why here it is done n-1-itr i dont understand and if any other method is there then also provide