I know ICPC as a coding test for people all over the world. Please tell me any coding test which are famous

Recently, I have given one Online Assessment of Amazon in which there was a question regarding use of Kadane's Algorithm. The question was like that we are given two arrays a and b and we have to multiply them and find out maximum subarray sum. range of elements of a is -1e8 to 1e8 and range of elements of b from -1e4 to 1e4. When I use Khan's it does not pass all test case but by brute it passes all test case.

Hello everyone, I want to upsolve question but I only found TLE Eliminators but sometimes I can not get their approach. Can you tell any other video or blogs which provide insight to solve question?

Hi users, I want to see rating increase or decrease in-between and after contest. Please tell me some websites or extensions.

Hello Everyone, from where you all study blogs for CP? Also if you find tutorial of codeforces sometimes difficult to understand then how you solve those questions? Also how many questions done someone upsolve?

https://codeforces.me/contest/2203/submission/[submission:364436643] and https://codeforces.me/contest/2203/submission/[submission:364375451] are same solution. Only I add a new unused variable.415411 Please tell.