Usually, during sys testing, I filter the submissions who failed system testing out of curiosity. I found many solutions that have failed test 5 on problem A, and it seems like all of them print an extra 100 if there are 100 test cases. There is no way so many solutions have failed with this seemingly intentional bug, so I think someone posted a solution which this bug and many people copy pasted it without realizing this. Did a coordinator post this code or did someone else do it?