Naive BFS Serialization with delimiters
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44/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
public class Codec {
private String serializeUtil(TreeNode root, String s){
if(root==null) s+="null,";
else{
s+=root.val+","+serializeUtil(root.left,s)+serializeUtil(root.right,s);
}
return s;
}
// Encodes a tree to a single string.
public String serialize(TreeNode root) {
return serializeUtil(root,"");
}
private TreeNode deserializeUtil(List<String> ls){
if(ls.get(0).equals("null")){
ls.remove(0);
return null;
}
TreeNode root=new TreeNode(Integer.valueOf(ls.get(0)));
ls.remove(0);
root.left=deserializeUtil(ls);
root.right=deserializeUtil(ls);
return root;
}
// Decodes your encoded data to tree.
public TreeNode deserialize(String data) {
String[] dataArr=data.split(",");
List<String> dataList = new LinkedList<String>(Arrays.asList(dataArr));
return deserializeUtil(dataList);
}
}
// Your Codec object will be instantiated and called as such:
// Codec codec = new Codec();
// codec.deserialize(codec.serialize(root));