We had to code 2 questions in 1.30 hr on codechef only. the questions are 
as follow :

1.) Implement Least Recently Used (LRU) algorithm - a well known algorithm 
of operating systems. 

2.) Find if a given number is Trojan Number. A Trojan number is a number 
which is strong but not a perfect power (m^k). A Strong number is a number 
which has a prime number 'p' its    factor and also divisible by p^2 i.e 
divisible by a prime and also by its square. 
Hence, Trojan number is a strong number , which can't be represented as m^k.

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