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#ifdef LOCAL
#include <bits/stdc++.h>
using namespace std;
// tree node stuff here...
struct TreeNode {
int val;
TreeNode *left;
TreeNode *right;
TreeNode(int x) : val(x), left(NULL), right(NULL) {}
};
#endif
static int __initialSetup =
[]()
{
std::ios::sync_with_stdio(false);
cin.tie(NULL);
return 0;
}
();
// handle special cases first
// [], "", ...
class Codec
{
private:
void encode(TreeNode *root, string &ans)
{
if (root) {
ans += (ans.size() == 0 ? "" : ",") + to_string(root->val);
encode(root->left, ans);
encode(root->right, ans);
} else {
ans += ",#";
}
}
TreeNode *decode(stringstream &ss)
{
string token;
if (getline(ss, token, ',')) {
// cout << token << endl;
if (token == "#") {
return NULL;
} else {
int val = stoi(token);
TreeNode *nxt = new TreeNode(val);
nxt->left = decode(ss);
nxt->right = decode(ss);
return nxt;
}
} else {
return NULL;
}
}
public:
// Encodes a tree to a single string.
string serialize(TreeNode *root)
{
string ans;
if (root == NULL)
return ans;
encode(root, ans);
// cout << ans << endl;
return ans;
}
// Decodes your encoded data to tree.
TreeNode *deserialize(string data)
{
stringstream ss;
ss.str(data);
return decode(ss);
}
};
// Your Codec object will be instantiated and called as such:
// Codec codec;
// codec.deserialize(codec.serialize(root));
#ifdef LOCAL
int main()
{
return 0;
}
#endif
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