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Leetcode 297. Serialize and Deserialize a binary tree
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‎.gitignore

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*.out
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*.app
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*.h.gch
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*.class
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.DS_Store

‎.idea/.gitignore

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‎.idea/DataStructures_Algorithms.iml

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‎.vscode/c_cpp_properties.json

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{
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"configurations": [
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{
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"name": "Mac",
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"${workspaceFolder}/**",
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"${workspaceFolder}/"
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],
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"defines": [],
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"macFrameworkPath": [
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"/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks"
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],
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"compilerPath": "/usr/bin/clang",
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"cStandard": "c11",
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"cppStandard": "c++17",
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"intelliSenseMode": "clang-x64"
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}
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],
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"version": 4
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}

‎.vscode/launch.json

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{
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"configurations": [
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{
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"type": "java",
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"name": "CodeLens (Launch) - main",
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"request": "launch",
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"mainClass": "main",
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"projectName": "DataStructures_Algorithms_89cff2ad"
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},
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{
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"type": "java",
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"name": "CodeLens (Launch) - LinkedList",
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"request": "launch",
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"mainClass": "LinkedList"
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}
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]
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}

‎.vscode/settings.json

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{
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"files.associations": {
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"__bit_reference": "cpp",
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"__config": "cpp",
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"__debug": "cpp",
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"__errc": "cpp",
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"__functional_base": "cpp",
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"__hash_table": "cpp",
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"__locale": "cpp",
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"__node_handle": "cpp",
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"__nullptr": "cpp",
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"__string": "cpp",
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"__threading_support": "cpp",
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"__tree": "cpp",
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"__tuple": "cpp",
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"algorithm": "cpp",
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"array": "cpp",
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"atomic": "cpp",
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"bitset": "cpp",
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"cctype": "cpp",
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"chrono": "cpp",
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"cinttypes": "cpp",
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"cmath": "cpp",
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"complex": "cpp",
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"cstdarg": "cpp",
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"cstddef": "cpp",
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"cstdint": "cpp",
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"cstdio": "cpp",
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"cstdlib": "cpp",
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"cstring": "cpp",
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"ctime": "cpp",
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"cwchar": "cpp",
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"deque": "cpp",
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"exception": "cpp",
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"optional": "cpp",
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"fstream": "cpp",
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"functional": "cpp",
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"future": "cpp",
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"initializer_list": "cpp",
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"iomanip": "cpp",
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"ios": "cpp",
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"iosfwd": "cpp",
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"iostream": "cpp",
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"istream": "cpp",
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"iterator": "cpp",
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"limits": "cpp",
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"list": "cpp",
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"locale": "cpp",
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"map": "cpp",
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"memory": "cpp",
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"mutex": "cpp",
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"new": "cpp",
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"numeric": "cpp",
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"ostream": "cpp",
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"queue": "cpp",
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"ratio": "cpp",
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"set": "cpp",
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"utility": "cpp",
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"vector": "cpp"
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}
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}

‎LeetCode/297. Serialize and Deserialize Binary Tree/Solution.java

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/**
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* Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later in the same or another computer environment.
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*
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* Design an algorithm to serialize and deserialize a binary tree.
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* There is no restriction on how your serialization/deserialization algorithm should work.
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* You just need to ensure that a binary tree can be serialized to a string and this string can be deserialized to the original tree structure.
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*
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* Example:
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*
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* You may serialize the following tree:
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*
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* 1
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* / \
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* 2 3
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* / \
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* 4 5
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*
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* as "[1,2,3,null,null,4,5]"
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*
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* Clarification: The above format is the same as how LeetCode serializes a binary tree.
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* You do not necessarily need to follow this format, so please be creative and come up with different approaches yourself.
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*
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* Note: Do not use class member/global/static variables to store states. Your serialize and deserialize algorithms should be stateless.
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*/
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/**
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* Definition for a binary tree node.
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* public class TreeNode {
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* int val;
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* TreeNode left;
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* TreeNode right;
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* TreeNode(int x) { val = x; }
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* }
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*/
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public class Codec {
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private static final String NULL = "X";
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private static final String DELIMIT = ",";
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// Encodes a tree to a single string.
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public String serialize(TreeNode root) {
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if (root == null)
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return NULL + DELIMIT;
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String leftSerialize = serialize(root.left);
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String rightSerialize = serialize(root.right);
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return root.val + DELIMIT + leftSerialize + rightSerialize;
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}
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// Decodes your encoded data to tree.
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public TreeNode deserialize(String data) {
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Queue<String> nodesToSerialize = new LinkedList<>();
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nodesToSerialize.addAll(Arrays.asList(data.split(DELIMIT))); //split with the comma's
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return deserializeHelper(nodesToSerialize);
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}
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private TreeNode deserializeHelper(Queue<String> nodesToSerialize)
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{
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String valueForNode = nodesToSerialize.poll();
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if (valueForNode.equals(NULL)) {
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return null;
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}
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TreeNode newNode = new TreeNode(Integer.valueOf(valueForNode));
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newNode.left = deserializeHelper(nodesToSerialize);
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newNode.right = deserializeHelper(nodesToSerialize);
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return newNode;
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}
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}
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// Your Codec object will be instantiated and called as such:
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// Codec codec = new Codec();
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// codec.deserialize(codec.serialize(root));

‎LeetCode/README.md

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- [x] [Lowest Common Ancestor of a Binary Tree](https://github.com/kalpak92/DataStructures_Algorithms/tree/master/LeetCode/236.%20Lowest%20Common%20Ancestor%20of%20a%20Binary%20Tree)
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- [x] [Binary Tree Zigzag Level order traversal](https://github.com/kalpak92/DataStructures_Algorithms/tree/master/LeetCode/103.%20Binary%20Tree%20Zigzag%20Level%20Order%20Traversal)
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- [x] [Subtree of another tree](https://github.com/kalpak92/DataStructures_Algorithms/tree/master/LeetCode/572.%20Subtree%20of%20Another%20Tree)
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- [x] [Serialize and Deserialize Binary Tree]()
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## Strings
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- [x] [Longest Palindrome](https://github.com/kalpak92/DataStructures_Algorithms/tree/master/LeetCode/409.%20Longest%20Palindrome)
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- [x] [Palindrome Permutation](https://github.com/kalpak92/DataStructures_Algorithms/tree/master/LeetCode/266.%20Palindrome%20Permutation)

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