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57th difficulty is 1. 3 difficulty is 2. 95 difficulty is 3. 44 difficulty is 4. so the difficulty level is increasing. The difficulty rating is the index of every element. The vi rating is the value at that array index
Perhaps for clarity it would be better to call vi a "simliarity" rating or something that describes a type/category, or cardinality instead of something that is ordinal like a "rating" or "ranking". It's frustrating to have to spend time to understand a problem because of unclear language.
then that means the difficulty level for the example in the question should be something like:
v => [5, 4, 7]
difficulty => [0, 1, 2]
since The vi rating is the value at that array index @dhereraj
i still don't get why the difficulty level of 44 is 4.