not getting output displayed
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@Vishal123
Issues with your indexing. Your indexing is wrong by 1 at several instances in your code. For example , the right of mergesort is initialised to n at the beginning instead of n-1. Similarly , the j in your merge() gets initialised from mid instead of mid+1. The i loop in same function should go from i=left till i<=mid.
Refer to my code - https://ide.codingblocks.com/s/172061
Most of the code is actually same. Just changing the indexing at some instances will make your code work.