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For testcase #3, my submission was marked as giving the wrong answer. I downloaded the input and output for that testcase, and it said the output should be "impossible", but I worked out my program's solution for that testcase by hand and it seems to work. Also, I have a friend who also worked on this problem and his solution was marked correct on that testcase, but his program verified that that testcase should output "possible", and that my solution works. What's happening?
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For testcase #3, my submission was marked as giving the wrong answer. I downloaded the input and output for that testcase, and it said the output should be "impossible", but I worked out my program's solution for that testcase by hand and it seems to work. Also, I have a friend who also worked on this problem and his solution was marked correct on that testcase, but his program verified that that testcase should output "possible", and that my solution works. What's happening?