Update README_EN.md

Author: yanglbme

solution/2600-2699/2685.Count the Number of Complete Components/README_EN.md

@@ -248,7 +248,7 @@ Take example 1 to explain：
 
 #### C++
 
-```c++
+```cpp
 class Solution {
 public:
     int countCompleteComponents(int n, vector<vector<int>>& edges) {
@@ -273,7 +273,6 @@ public:
         return ans;
     }
 };
-// cost：283ms、beats 5%.
 ```
 
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