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Solution.java

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class TreeNode {

int val;

TreeNode left;

TreeNode right;

TreeNode(int x) {

val = x;

}

}

public class Solution {

public TreeNode sortedArrayToBST(int[] num) {

return sortedArrayToBST(num, 0, num.length - 1);

}

private TreeNode sortedArrayToBST(int[] num, int left, int right) {

if (left > right) return null;

if (left == right) return new TreeNode(num[left]);

int mid = (right + left) >> 1;

TreeNode e = new TreeNode(num[mid]);

e.left = sortedArrayToBST(num, left, mid - 1);

e.right = sortedArrayToBST(num, mid + 1, right);

return e;

}

}