O(1) Solution:


  • 0
    B
    class Codec {
    public:
        TreeNode* hehe;
        // Encodes a tree to a single string.
        string serialize(TreeNode* root) {
            hehe = root;
            return "hehe";
        }
    
        // Decodes your encoded data to tree.
        TreeNode* deserialize(string data) {
            return hehe;
        }
    };
    

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