Update

problems/0028.实现strStr().md

@@ -8,17 +8,18 @@ https://leetcode-cn.com/problems/implement-strstr/
 ## C++代码
 
 ```
+
 class Solution {
 public:
     void preKmp(int* next, const string& s){
-        next[0]=-1;
-        int j=-1;
-        for(int i=1;i<s.size();i++){
-            while(j>=0 && s[i]!=s[j+1])
+        next[0] = -1;
+        int j = -1;
+        for(int i = 1; i < s.size(); i++){
+            while(j >= 0 && s[i] != s[j+1])
                 j = next[j];
-            if(s[i]==s[j+1])
+            if(s[i] == s[j+1])
                 j++;
-            next[i]=j;
+            next[i] = j;
         }
     }
     int strStr(string haystack, string needle) {
@@ -44,6 +45,5 @@ public:
     }
 };
 
-
 ```
 > 笔者在先后在腾讯和百度从事技术研发多年，利用工作之余重刷leetcode，本文  [GitHub](https://github.com/youngyangyang04/leetcode-master )：https://github.com/youngyangyang04/leetcode-master 已经收录，欢迎star，fork，共同学习，一起进步。