diff --git a/solutions/187. Repeated DNA Sequences.md b/solutions/187. Repeated DNA Sequences.md
index 6409699..1487a20 100644
--- a/solutions/187. Repeated DNA Sequences.md	
+++ b/solutions/187. Repeated DNA Sequences.md	
@@ -43,7 +43,7 @@ public:
     vector<string> findRepeatedDnaSequences(string s) {
         unordered_set<int>substr_set;
         unordered_set<string>output_set;
-        unordered_map<int, int> mp{{'A', 0}, {'C', 1}, {'G', 2}, {'T', 3}}; // 注意学习这种初始化方法
+        unordered_map<int, int> mp{ {'A', 0}, {'C', 1}, {'G', 2}, {'T', 3} }; // 注意学习这种初始化方法
         
         int cur = 0; // 当前子串对应的int值
         for (int i = 0; i < 9; ++i) cur = (cur << 2) | mp[s[i]];