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4th question

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Compilation time: 0.83 sec, absolute service time: 1,02 sec 
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Error(s), warning(s):
1841918501/ warning: [rawtypes] found raw type: LinkedList
           LinkedList<Integer> a[]=new LinkedList[n];
  missing type arguments for generic class LinkedList<E>
  where E is a type-variable:
    E extends Object declared in class LinkedList
1841918501/ warning: [unchecked] unchecked conversion
           LinkedList<Integer> a[]=new LinkedList[n];
  required: LinkedList<Integer>[]
  found:    LinkedList[]
1841918501/ error: incompatible types: LinkedList<Integer>[] cannot be converted to LinkedList<Integer>
       int ans= dfs(inode,visited,a);
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error
2 warnings