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README.md

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<sub>[0230 - Kth Smallest Element In a Bst](https://leetcode.com/problems/kth-smallest-element-in-a-bst/)</sub> | <sub><div align='center'>[✔️](c%2F0230-kth-smallest-element-in-a-bst.c)</div></sub> | <sub><div align='center'>[✔️](cpp%2F0230-kth-smallest-element-in-a-bst.cpp)</div></sub> | <sub><div align='center'>[✔️](csharp%2F0230-kth-smallest-element-in-a-bst.cs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](go%2F0230-kth-smallest-element-in-a-bst.go)</div></sub> | <sub><div align='center'>[✔️](java%2F0230-kth-smallest-element-in-a-bst.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F0230-kth-smallest-element-in-a-bst.js)</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0230-kth-smallest-element-in-a-bst.kt)</div></sub> | <sub><div align='center'>[✔️](python%2F0230-kth-smallest-element-in-a-bst.py)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](rust%2F0230-kth-smallest-element-in-a-bst.rs)</div></sub> | <sub><div align='center'>[✔️](scala%2F0230-kth-smallest-element-in-a-bst.scala)</div></sub> | <sub><div align='center'>[✔️](swift%2F0230-kth-smallest-element-in-a-bst.swift)</div></sub> | <sub><div align='center'>[✔️](typescript%2F0230-kth-smallest-element-in-a-bst.ts)</div></sub>
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<sub>[0105 - Construct Binary Tree From Preorder And Inorder Traversal](https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/)</sub> | <sub><div align='center'>[✔️](c%2F0105-construct-binary-tree-from-preorder-and-inorder-traversal.c)</div></sub> | <sub><div align='center'>[✔️](cpp%2F0105-construct-binary-tree-from-preorder-and-inorder-traversal.cpp)</div></sub> | <sub><div align='center'>[✔️](csharp%2F0105-construct-binary-tree-from-preorder-and-inorder-traversal.cs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](go%2F0105-construct-binary-tree-from-preorder-and-inorder-traversal.go)</div></sub> | <sub><div align='center'>[✔️](java%2F0105-construct-binary-tree-from-preorder-and-inorder-traversal.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F0105-construct-binary-tree-from-preorder-and-inorder-traversal.js)</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0105-construct-binary-tree-from-preorder-and-inorder-traversal.kt)</div></sub> | <sub><div align='center'>[✔️](python%2F0105-construct-binary-tree-from-preorder-and-inorder-traversal.py)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](typescript%2F0105-construct-binary-tree-from-preorder-and-inorder-traversal.ts)</div></sub>
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<sub>[0096 - Unique Binary Search Trees](https://leetcode.com/problems/unique-binary-search-trees/)</sub> | <sub><div align='center'>[✔️](c%2F0096-unique-binary-search-trees.c)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](java%2F0096-unique-binary-search-trees.java)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0096-unique-binary-search-trees.kt)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
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<sub>[0095 - Unique Binary Search Trees II](https://leetcode.com/problems/unique-binary-search-trees-ii/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'></div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0095-unique-binary-search-trees-ii.kt)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
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<sub>[0095 - Unique Binary Search Trees II](https://leetcode.com/problems/unique-binary-search-trees-ii/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](java%2F0095-unique-binary-search-trees-ii.java)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0095-unique-binary-search-trees-ii.kt)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
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<sub>[0129 - Sum Root to Leaf Numbers](https://leetcode.com/problems/sum-root-to-leaf-numbers/)</sub> | <sub><div align='center'>[✔️](c%2F0129-sum-root-to-leaf-numbers.c)</div></sub> | <sub><div align='center'>[✔️](cpp%2F0129-sum-root-to-leaf-numbers.cpp)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](java%2F0129-sum-root-to-leaf-numbers.java)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0129-sum-root-to-leaf-numbers.kt)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
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<sub>[0337 - House Robber III](https://leetcode.com/problems/house-robber-iii/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](java%2F0337-house-robber-iii.java)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0337-house-robber-iii.kt)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
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<sub>[0951 - Flip Equivalent Binary Trees](https://leetcode.com/problems/flip-equivalent-binary-trees/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](java%2F0951-flip-equivalent-binary-trees.java)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0951-flip-equivalent-binary-trees.kt)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
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class Solution {
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public List<TreeNode> generateTrees(int n) {
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return generate(1, n);
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}
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private List<TreeNode> generate(int left, int right) {
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if (left > right) {
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List<TreeNode> r = new ArrayList<>();
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r.add(null);
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return r;
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}
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List<TreeNode> res = new ArrayList<>();
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for (int val = left; val <= right; val++) {
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for (TreeNode leftSubtree : generate(left, val - 1)) {
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for (TreeNode rightSubtree: generate(val + 1, right)) {
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TreeNode root = new TreeNode(val);
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root.left = leftSubtree;
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root.right = rightSubtree;
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res.add(root);
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}
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}
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}
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return res;
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}
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}

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