Codechef IDE is horrible(for me atleast)

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Generally you get such problem when you hit run on IDE without custom inputs, Segmentation error is most common in this case, Personally i have been through so always try with custom inputs.

Read this :-

New to Codechef. Can't understand the platform

One thing that trips up all people migrating from Hackerrank (hello :)) is that clicking “Run” (not “Submit”) here on Codechef does not run your code with the sample testcases - instead, it runs it with empty input (so attempts to read anything from stdin will fail, or give weird values). If you click “Run”, you must provide Custom Input.