Merge pull request #109 from Joshua-Lu/patch-26

更新 0108.将有序数组转换为二叉搜索树 Java版本

problems/0108.将有序数组转换为二叉搜索树.md

@@ -209,27 +209,28 @@ public:
 
 
 Java：
-```java
+```Java
 class Solution {
     public TreeNode sortedArrayToBST(int[] nums) {
-        return sortArr(nums,0,nums.length);
+        return sortedArrayToBST(nums, 0, nums.length);
     }
     
-    private TreeNode sortArr(int[] nums, int lo, int hi) {
+    public TreeNode sortedArrayToBST(int[] nums, int left, int right) {
-        if (lo == hi) return null;
+        if (left >= right) {
-        int rootIdx = (lo + hi)/2;
+            return null;
-
+        }
-        int rootValue = nums[rootIdx];
+        if (right - left == 1) {
-        TreeNode root = new TreeNode(rootValue);
+            return new TreeNode(nums[left]);
-
+        }
-        root.left = sortArr(nums,lo,rootIdx);
+        int mid = left + (right - left) / 2;
-        root.right = sortArr(nums,rootIdx+1,hi);
+        TreeNode root = new TreeNode(nums[mid]);
-
+        root.left = sortedArrayToBST(nums, left, mid);
+        root.right = sortedArrayToBST(nums, mid + 1, right);
         return root;
     }
 }
-```
 
+```
 
 Python：