Editorial is wrong

#1

In subseq function, in the foreach loop the object valrial is used as string which is the wrong implementation

#2

@Predator
The ArrayLists are made of strings

ArrayList<string>

Hence the for each loop is correct.
You may not have been able to see the string type written due to a markdown rendering issue. I have updated the editorial. Kindly check it out again.

#3

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