Eclipse Run Results for combination

1 Importjava.util.ArrayList;2 Importjava.util.Arrays;3 4 5  Public classCombination {6     7      Public StaticArraylist<arraylist<integer>> Combine (intNintk) {8arraylist<arraylist<integer>> res =NewArraylist<arraylist<integer>>();9         if(N <= 0| | N <k)Ten             returnRes; Onearraylist<integer> item =NewArraylist<integer>();  ADFS (N,k,1,item, res);//because it need to begin from 1 -         returnRes; -     } the      -     Private Static voidDfsintNintKintStart, arraylist<integer> item, arraylist<arraylist<integer>>Res) { -         if(item.size () = =k) { -Res.add (NewArraylist<integer> (item));//because item is arraylist<t> so it would not be disappear from the stack to stack + System.out.println (item); -             return; +         } A          for(inti=start;i<=n;i++){ at System.out.println (i); - Item.add (i); -DFS (n,k,i+1, item,res); - System.out.println (i); -Item.remove (Item.size ()-1); - System.out.println (item); in  -         } to     } +      -      Public Static voidMain (string[] args) the     { *arraylist<arraylist<integer>> res =NewArraylist<arraylist<integer>>(); $Res=combine (3,2);Panax Notoginseng System.out.println (res); -  the       } +  A}

[1, 2]2[1]3[1, 3]3[1]1[]23 [2, 3]3[2]2[][][[1, 2], [1, 3], [2, 3]]

Eclipse Run Results for combination