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Dynamically check difference between elements in a list

I have a list of containing a set of number in ascending order. I have another set of numbers containing a few elements. I need to check the difference between elements in a list such that are present in a set and of the difference is 5 or more. I need to delete all the numbers higher than it. Example:

list contains {1,5,7,8,12,17,18}

set= {7,12,21}

I run a loop in a list pointing two elements. In the first 1 and 5. Since both of them are not in the set no need to calculate the difference.

We continue the same process till 7 and 8. Here, I need to check the difference between 7,8 but since 8 is not in the set, I need to do increments such that the difference between 12 and 7 is calculated. If the difference is 5 or more I need to delete all elements from the list which are higher than the number from set. i.e 7

In this case elements deleted from list are {8,12,17,18}. Only numbers below the number from the set are deleted with a condition that at least two numbers from the set are in the list and their gap is at least 5.

Here is the sample code I have written so far

for (int i=1;i<list.size();i++){

if(set.contains(list[i]) && set.contains(list[i+1]))

This checks only successive values and doesn't move ahead. How to make this dynamic?

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