Can someone explain hacks/challenges in a contest?

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hacks means finding test cases (in other’s solution) for which his/her solution will fail . If you rightly just the test cases for which his/her code will fail you will be allocated some points , but before you try to hack you have to lock your problem means you cant submit for that problem anyone and you have solved it already .
(this concept is used in codeforces rounds , in codeforces rounds you are awarded 100 points for successful hacks , and 50 points are deducted for unsuccessful hacks )