Dont know y my answer is wrong

#1

problem
https://hack.codingblocks.com/app/practice/2/276/problem
my code

#2

The answer variable should not be int
As the value would overflow int
It should ideally be long long
But the setter wrote it as int too and made the testcases accordingly
That’s why its not working properply

so instead of long long int use int testcases will pass

#3

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