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Solution.java

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class ListNode {

int val;

ListNode next;

ListNode(int x) { val = x; next = null; }

}

class TreeNode {

int val;

TreeNode left;

TreeNode right;

TreeNode(int x) { val = x; }

}

public class Solution {

ListNode curr;

public TreeNode sortedListToBST(ListNode head) {

curr = head;

int size = 0;

while (curr != null) {

size++;

curr = curr.next;

}

curr = head;

return _makeBST(0, size - 1);

}

private TreeNode _makeBST(int low, int high) {

if (low > high) return null;

int mid = low + (high - low) / 2;

TreeNode left = _makeBST(low, mid - 1);

TreeNode root = new TreeNode(curr.val);

curr = curr.next;

root.left = left;

root.right = _makeBST(mid + 1, high);

return root;

}

}