does anyone from cf have id in ctf(https://ctftime.org/)? and are you active there? ctf is a site that holds contest on cyber security.

I wanted to solve a problem. After solving the problem I wanted to see the difference between my code and someone's code. To see others solution code I went to some specific profiles > submission > specific contest > problem no(let say 1506). But after visiting 20 profiles I found that none of them solved the problem 1506. Is there any way to find out who solved a specific problem by not going to their profiles. Let say I searched for the problem 1506 and all who solved that problem will be showed. Thanks in advance.

In Codeforces I see some name such as Codeforces Global Round and Codeforces Round. My question is what is the differences between these two contest? Why there are two names?

I am not good at Mathematics. But I want to be a good programmer. Is it so much needed to be good in Math to be a good programmer? What do you think? And if math is needed then which kind of math is needed?

What does this number refer to with country name? On the column Member Count there are 2 numbers. What do the bracketed number refer to? And what about the Rating column?

Edit:I could not add the screenshot.