diff --git a/.gitignore b/.gitignore
index 10dfe84..74ecf6f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,5 @@ target/
 .*
 
 .clang-tidy
+
+build/
\ No newline at end of file
diff --git a/daily/Aug18.cc b/daily/Aug18.cc
new file mode 100644
index 0000000..c361a43
--- /dev/null
+++ b/daily/Aug18.cc
@@ -0,0 +1,16 @@
+#include <string>
+using namespace std;
+
+class Solution {
+ public:
+  /**
+   * @brief LC: 551: Student Attendance Record I [E]
+   * Just use the CPP feature, Time: O(N), Space: O(1)
+   *
+   * @param s
+   * @return true, false
+   */
+  bool checkRecord(string s) {
+    return ranges::counts(s, 'A') && s.find("LLL") == string::npos;
+  }
+};
\ No newline at end of file