Problem Link: DIVISIBLEBY8 Problem - CodeChef
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Wrong testcases
Nah, brother. The test cases are correct, in my opinion. You may say the test cases are wrong because your solution might not be covering all the requirements of the problem (usual situation).
Right here, I solved this problem in python programming language:
codechef.com/viewsolution/1025297287
Visit here. There, I explained this problem. I think, that would be helpful))