Consider this sentence:
The solution to this question should no more difficult be obtained than that to the other question.
Is this sentence grammatical?
Is difficult here used as an adverb?
Consider this sentence:
The solution to this question should no more difficult be obtained than that to the other question.
Is this sentence grammatical?
Is difficult here used as an adverb?
Difficult is an adjective. There is no adverb like "difficultly". If you want an adverb there is "laboriously" or "arduously" or you can use "with difficulty"
Your sentence is not grammatically correct, here are better examples:
The solution to this question should not be more difficult to obtain than that to the other question.
The solution to this question should not be obtained with more difficulty than that to the other question.
The solution to this question should not be obtained more laboriously than that to the other question.
Edit: Following the comments, here's an example of an easier sentence:
"Obtaining the answer to this question should not be more difficult than obtaining the one to the other question"
I used "answer" here, which is more friendly with "question". "Solution" would be more appropriate for a "problem"
Hope that helps you to understand
You might prefer problem to question or other things.. but that's just preferrence, the OP only wanted something gramatically correct.
I understand your point nonetheless, feel free to edit my answer to add additional wordings that you deem more elegant. thank you :)
– Manuki Jan 17 '19 at 12:26