The doubt is in the IDE

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Hello @Ak07,

The reason of this is written in your code only i.e.
the statement int j = number*number;
the value of number = 1000000(approx), the value of the product will be very large i.e. greater then the range of int and thus the value would be rounded of to a negative number. Thus, leading to segmentation error as you would access a memory address that is not allocated while executing the statement p[j].

Thus, using ll is solving this issue.

Hope, this would help.
Give a like if you are satisfied.