Wouldn’t it be nice to search for problems using their ID?
Google Search Problem ID and codechef word together 
For Example “REIGN codechef” The first link will be what you are searching for 
Easy Ryt why bothering our codechef guys they are busy with many imp things than this #no #offence
Most of the times even the Codechef word is not necessary just google searching problem ID will suffice
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I didn’t know that. Sorry