diff --git a/18-Programming-4kids/11_homework_3_answer.cpp b/18-Programming-4kids/11_homework_3_answer.cpp
index 5e1e78c..29b7034 100644
--- a/18-Programming-4kids/11_homework_3_answer.cpp
+++ b/18-Programming-4kids/11_homework_3_answer.cpp
@@ -1,29 +1,28 @@
-#include<iostream>
+#include <iostream>
+
 using namespace std;
 
-int main() {
-	string big_str, small_str;
-	cin >> big_str >> small_str;
+int main()
+{
+    string big_str, small_str;
+    cin>>big_str>>small_str;
+    bool flag = 0;
+    int big_size = (int)big_str.size();
+    int small_size = (int)small_str.size();
 
-	if (small_str.size() > big_str.size()) {
+    if (small_size > big_size) {
 		cout << "NO\n";
 		return 0;
 	}
 
-	// For every possible position in big_str, try to match with the small
-	for (int i = 0; i < (int) big_str.size() - (int) small_str.size() + 1; ++i) {
-		bool is_match = true;
+    for(int i = 0, j = 0; i < big_size; i++){
+        if(big_str[i] != small_str[j++]){
+            j = 0;
+        }
 
-		for (int j = 0; j < (int) small_str.size() && is_match; ++j) {
-			if (small_str[j] != big_str[i + j])
-				is_match = false;
-		}
-		if (is_match) {
-			cout << "YES\n";
-			return 0;
-		}
-	}
-	cout << "NO\n";
+        if(j == small_size)flag = 1;
+    }
 
-	return 0;
+    if(flag)cout << "YES\n";
+    else cout << "NO\n";
 }