10 minutes remaining in the contest, but you’re still a few points short of advancing. Armed with your mighty coding powers, the first three problems fall quickly, but problem 4 is proving a tough nut to crack. After four incorrect attempts, your time is running short, and you’re searching desperately for an off-by-one error, an edge case you haven’t considered.
You read the problem statement one more time, and at last, you find it. An integer overflow bug. With a wide grin, you fix the bug with a few quick keystrokes. You upload the source code file...
