Problem Statement
A pharmacist is making a mixture of several ingredients. She needs to know the density of the resulting mixture. Density is defined as the mass of the mixture divided by its volume.
You're given a String[] ingredients, each element of which describes a single ingredient and is formatted "<Volume> ml of <Name>, weighing <Mass> g" (quotes for clarity). <Volume> and <Mass> are integers representing the volume in milliliters and mass in grams, respectively. <Name> is the name of the ingredient.
Return the density of the resulting mixture in grams per milliliters.
Definition
- Class:
- MixtureDensity
- Method:
- getDensity
- Parameters:
- String[]
- Returns:
- double
- Method signature:
- double getDensity(String[] ingredients)
- (be sure your method is public)
Notes
- The returned value must be accurate to within a relative or absolute value of 1E-9.
Constraints
- ingredients will contain between 1 and 50 elements, inclusive.
- Each element of ingredients will contain between 23 and 50 characters, inclusive.
- Each element of ingredients will be formatted as described in the statement.
- Each <Volume> in ingredients will be an integer between 1 and 1000, inclusive, with no leading zeroes.
- Each <Mass> in ingredients will be an integer between 1 and 1000, inclusive, with no leading zeroes.
- Each <Name> in ingredients will contain only lowercase letters ('a'-'z') and spaces (' ').
- Each <Name> in ingredients will begin and end with a lowercase letter.
Examples
{"200 ml of oil, weighing 180 g"}Returns: 0.9
The density is mass/volume = 180g/200ml = 0.9g/ml, the answer is 0.9.{"100 ml of dichloromethane, weighing 130 g", "100 ml of sea water, weighing 103 g"}Returns: 1.165
The volume of the resulting mixture is 200 ml and the mass is 233 g. Therefore, the density is 233g/200ml = 1.165g/ml.{"1000 ml of water, weighing 1000 g", "500 ml of orange juice concentrate, weighing 566 g"}Returns: 1.044
{"1000 ml of something l i g h t, weighing 1 g"}Returns: 0.0010
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