Playing with cards in stack

#1

why is it giving run error on first two test case??
code link : https://ide.codingblocks.com/s/319145

#2

Using prime sieve, you have to store all the prime numbers upto 10^5.
But you are storing prime numbers only upto 29.
You can refer this implementation https://ide.codingblocks.com/s/319264

#3

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