diff --git a/03 Sliding Window/03 string_window.cpp b/03 Sliding Window/03 string_window.cpp
index 5173a2e..8f17fe8 100644
--- a/03 Sliding Window/03 string_window.cpp	
+++ b/03 Sliding Window/03 string_window.cpp	
@@ -11,7 +11,7 @@ string find_window(string s,string p){
 	int FS[256] = {0};
 
 	for(int i=0;i<p.length();i++){
-		FP[ps[i]]++;
+		FP[p[i]]++;
 	}
 
 	//Sliding Window Algorithm
@@ -72,4 +72,4 @@ int main(){
 
 
 	return 0;
-}
\ No newline at end of file
+}