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Normally, competitive programming helper is a very convenient platform for solving competitive programming problems. However, I faced a new problem : when I "run" my testcases (press the green button at the left screen in the picture), the word "SIGTERM" appears all the time. Normally, from my observation, SIGTERM appears only when the code was crashed (popping empty data structure or divide zero). However, I don't give up and try to use code runner (vscode extension), but I have to wait around 5-10 seconds when using terminal.

Now, these difficulties prevent me from achieving good performance when doing codeforces contest. Does anyone face these kinds of problems before? Can anyone help me?

Does anyone face problem like me? I found that when I tried to write two pointer, I am very confused and I struggle with my code for very long time. Sometimes, I easily bugged. How can I improve this?