simple java 2ms solution, dfs

  • 1
    public List<String> binaryTreePaths(TreeNode root) {
            if(root == null) return new ArrayList<String>();
            List<String> result = new ArrayList<String>();
            dfs(root, "", result);
            return result;
        private void dfs(TreeNode root, String s, List<String> result){
            if(root.left == null && root.right==null)
            if(root.left != null)
                dfs(root.left, s+String.valueOf(root.val)+"->", result);
            if(root.right !=null)
                dfs(root.right, s+String.valueOf(root.val)+"->", result);

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