Difference between difficulty levels in challenge , Peer , HARD

What is the difference between the difficulty levels in the
Challenge,Hard and Peer problems available in the practice problems of CODECHEF ?

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The peer section consists of the problems from the contests organised by various external schools and colleges at codechef.
whereas hard section contains some of the toughest problems at codechef.
and the challenge problems are there to make you ready for tough coding competitions.

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