Problem Statement

In this problem, a left single arrow is defined as a "less than" character ('<') immediately followed by zero or more consecutive hyphen characters ('-'). A left double arrow is a "less than" character ('<') immediately followed by zero or more consecutive equals characters ('='). A right single arrow is zero or more hyphen characters ('-') immediately followed by a "greater than" character ('>'). A right double arrow is zero or more equals characters ('=') immediately followed by a "greater than" character ('>'). For example, the following are arrows (quotes for clarity only): "==>", "<-", "<", "<===", "--->", ">". The length of an arrow is the number of characters it contains.

You will be given a String s. Return the length of the longest arrow in s, or -1 if it does not contain any arrows.

Definition

 Class: Arrows Method: longestArrow Parameters: String Returns: int Method signature: int longestArrow(String s) (be sure your method is public)

Notes

-Arrows may overlap. See examples for further clarifications.

Constraints

-s will contain between 1 and 50 characters, inclusive.
-Each character in s will be one of '<', '>', '-' or '='.

Examples

0)

 "<--->--==>"
Returns: 4
 The arrows contained in s in this case are, by order of appearance: "<", "<-", "<--", "<---", "--->", "-->", "->", ">", "==>", "=>" and ">". Note that many of these arrows, including some pairs with one left arrow and one right arrow, are overlapping.
1)

 "<<<<<<<<<<"
Returns: 1
 All arrows are of length 1. Note that "<" is both a left single arrow and a left double arrow according to the definition.
2)

 "----==-"
Returns: -1
 No arrows contained.
3)

 "<----=====>"
Returns: 6

Problem url:

http://www.topcoder.com/stat?c=problem_statement&pm=7256

Problem stats url:

http://www.topcoder.com/tc?module=ProblemDetail&rd=10010&pm=7256

soul-net

Testers:

PabloGilberto , brett1479 , Olexiy , misof

Problem categories:

Search, String Manipulation