I just saw in a recent Leetcode contest that there were thousands of submissions during a contest with almost the same code/solution. I can't imagine that's only happening on Leetcode, right? If this is a problem on Codeforces, I'm curious how it's handled? Thanks

I've always wondered why so many CP platforms require that the submission prints the result to stdout instead of specifying a function name, inputs, and return types like Leetcode. Is there a good reason for this?