[google大赛 入围赛250分真题] SalesFigures

Problem Statement
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A company stores sales data in a single, cumbersome file. Each line of the file represents one sale and is formatted as:
    CLIENT_ID CNT_1 PRODUCT_1 CNT_2 PRODUCT_2 …
This indicates that CNT_1 units of PRODUCT_1 were sold to the client whose id is CLIENT_ID, and CNT_2 units of PRODUCT_2 and so on. You have been tasked with figuring out how many units of a particular product have been sold over time to a particular client. You will be given a String[] sales, a String, client, and a String, product. You are to return an int representing how many units of product were sold to client in sales.
Definition
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Class:
SalesFigures
Method:
getCount
Parameters:
String[], String, String
Returns:
int
Method signature:
int getCount(String[] sales, String client, String product)
(be sure your method is public)
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Constraints
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sales will contain between 1 and 50 elements, inclusive.
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Each element of sales will be formatted as described in the problem statement, with at least 1 product and at most 50 characters.
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CLIENT_ID and each PRODUCT_* will contain between 1 and 10 uppercase letters (‘A’-'Z’), inclusive.
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Each CNT_* will represent an integer between 1 and 999, inclusive, with no leading zeros.
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client will contain between 1 and 10 uppercase letters (‘A’-'Z’), inclusive.
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product will contain between 1 and 10 uppercase letters (‘A’-'Z’), inclusive.
Examples
0)

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{“BOB 1 SHOE”,
 ”JOHN 2 SHOE”,
 ”BOB 3 SHOE 1 HORSE”}
“BOB”
“SHOE”
Returns: 4

1)

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{“MEG 1 TV 1 VCR 10 DVD 3 DVD”,
 ”HARRY 2 TV 6 DVD”,
 ”MEG 11 DVD”,
 ”MEG 2 TV”,
 ”HARRY 101 DVD”}
“MEG”
“DVD”
Returns: 24
Note that “DVD” occurs twice in the first element.
2)

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{“GEORGE 999 PETS”}
“BOB”
“SHOE”
Returns: 0

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