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Create kth smallest element in binary tree #4

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Create kth smallest element in binary tree #4

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11 changes: 11 additions & 0 deletions kth smallest element in binary tree
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Original file line number Diff line number Diff line change
@@ -0,0 +1,11 @@
public ArrayList<Integer> list=new ArrayList<>();
public int kthSmallest(TreeNode root, int k) {
if(root==null) return 0;
int l=kthSmallest(root.left,k);
if(l!=0)
return l;
list.add(root.val);
if(list.size()==k) return list.get(list.size()-1);
return kthSmallest(root.right,k);

}