item is a temporary reference to elements in the list and is tracked based on their location in memory which is arranged based on the positioning of elements in the list. So, if one item is removed, the items behind get moved forward and the loop will continue to iterate through elements after the last registered position despite there is a change in previous elements

there's not much help anyone can give without knowing your language/code snippet

when you comment your code, flag it as having spoiler content

Thank you, so much! It helped!)))

the test has limited cases. when you attempt, it runs more number of different cases than during initial test. Probably it is showing an error in cases when array2 or array1 are null or None. what to do in these cases has been specified in instruction