Please explain why am i getting a SIGSEGV error. I am getting the correct output though

Here is the Question :

My Code:

Please either format your code or link to your submission - the forum software has mangled it and it won’t compile! :slight_smile:

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provided the link

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Remember that the number of rounds, N, can go as high as 10000. How many can you store in your program?

increase the array size : a[100009]

given N<=10000 so u have to change arr[20] to arr[10001]