Update solution_code.md

[Mungeryang]

Fixes

我修改的是如下题目的 xx 解法：

通过截图如下：

[Mungeryang]

我修改的是如下题目的 LCR 048. 二叉树的序列化与反序列化](https://leetcode.cn/problems/h54YBf/)解法：

class Codec {
public:
    // Serialize the tree to a string
    string serialize(TreeNode* root) {
        ostringstream out;
        serialize(root, out);
        return out.str();
    }

    // Deserialize the string to a tree
    TreeNode* deserialize(string data) {
        istringstream in(data);
        return deserialize(in);
    }

private:
    // Helper function to serialize the tree
    void serialize(TreeNode* root, ostringstream& out) {
        if (root) {
            out << root->val << ' ';
            serialize(root->left, out);
            serialize(root->right, out);
        } else {
            out << "# ";
        }
    }

    // Helper function to deserialize the tree
    TreeNode* deserialize(istringstream& in) {
        string val;
        in >> val;
        if (val == "#") {
            return nullptr;
        }

        TreeNode* root = new TreeNode(stoi(val));
        root->left = deserialize(in);
        root->right = deserialize(in);

        return root;
    }
};

通过截图如下：
抱歉东哥，我不太会插图哎...