Merge pull request doocs#281 from tczhangzhi/patch-1

Fix outdate number error of findRepeatNumber

Author: yanglbme

lcof/面试题03. 数组中重复的数字/README.md

@@ -35,7 +35,8 @@ class Solution:
                 if num == nums[num]:
                     return num
                 nums[i], nums[num] = nums[num], nums[i]
-
+                num = nums[i]
+        return -1
 ```
 
 ### **Java**
@@ -96,4 +97,4 @@ func findRepeatNumber(nums []int) int {
 ```
 
 ```
-<!-- tabs:end -->
+<!-- tabs:end -->