CHEATING : 7 exactly same solution for MIKE3

Here is a list of 7 exactly same solutions made by different users for the problem MIKE3, asked in MARCH14.

http://www.codechef.com/viewsolution/3614167http://www.codechef.com/viewsolution/3616421http://www.codechef.com/viewsolution/3614701http://www.codechef.com/viewsolution/3616518http://www.codechef.com/viewsolution/3613790http://www.codechef.com/viewsolution/3613381http://www.codechef.com/viewsolution/3613382

Please list some measures that Codechef should adopt to reduce such cases in future.