Open online contest/problem you want to solve and parse with competitive-companion extension. All problems along with the testcases are downloaded and you are ready to code.
Work on your solution on sol.cpp.
After you finish call Run and automatically your program will be compiled and run against every testcases. If the solutions is correct, it will be reported as Ok otherwise you will see failing test case. You can always go back to original layout calling View: Code.
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