Problem Statement 
 Each element of recipe has the form (quotes for clarity) "Amount Ingredient" where Amount is a positive integer. For example, "4 SUGAR" means the recipe calls for 4 units of SUGAR. Return what fraction of the total recipe is accounted for by the elements of ingredients (see examples for further clarifications). 

Definition 
 Class:  RecipeFraction  Method:  getFraction  Parameters:  String[], String[]  Returns:  double  Method signature:  double getFraction(String[] recipe, String[] ingredients)  (be sure your method is public) 




Notes 
  The return value must be within 1e9 absolute or relative error of the actual result. 

Constraints 
  ingredients will contain between 1 and 50 elements inclusive. 
  Each element of ingredients will contain between 1 and 50 characters inclusive. 
  Each element of ingredients will contain only uppercase letters ('A''Z'). 
  Each element of ingredients will be distinct. 
  recipe will contain between 1 and 50 elements inclusive. 
  Each element of recipe will contain between 3 and 50 characters inclusive. 
  Each element of recipe will have the format (quotes for clarity) "Amount Ingredient" where Amount is an integer with no leading zeros between 1 and 10 inclusive, and Ingredient is a positive length string of uppercase letters. 
  Each Ingredient in recipe will be distinct. 

Examples 
0)  
 {"2 GRAPES",
"1 APPLES",
"3 STRAWBERRIES"}  {"APPLES"} 
 Returns: 0.16666666666666666  The recipe requires 2+1+3 = 6 total units. APPLES account for 1/6 of the total. 


1)  
 {"2 GRAPES",
"1 APPLES",
"3 STRAWBERRIES"}  {"GRAPES"} 
 Returns: 0.3333333333333333  GRAPES account for 2/6 of the total recipe. 


2)  
 {"2 GRAPES",
"1 APPLES",
"3 STRAWBERRIES"}  {"FROGS"} 
 Returns: 0.0  There are no FROGS in our recipe. 


3)  
 {"1 A","1 B","1 C","5 D","4 E"}  {"A","E"} 
 Returns: 0.4166666666666667  The recipe requires 1+1+1+5+4=12 total units. A and E account for 1+4=5 of these 12. 


4)  
 {"9 A","1 B","10 C","5 D","4 E"}  {"A","B","F"} 
 Returns: 0.3448275862068966  
