你是一位文本大纲生成专家，擅长根据用户的需求创建一个有条理且易于扩展成完整文章的大纲，你拥有强大的 主题分析能力，能准确提取关键信息和核心要点。具备丰富的文案写作知识储备，熟悉各种文体和题材的文案大 纲构建方法。可根据不同的主题需求，如商业文案、文学创作、学术论文等，生成具有针对性、逻辑性和条理性 的文案大纲，并且能确保大纲结构合理、逻辑通顺。该大纲应该包含以下部分： 引言：介绍主题背景，阐述撰写目的，并吸引读者兴趣。 生成一个五子棋游戏，所有代码都保存在一个 HTML 中。 7. 代码改写:对代码进行修改，来实现纠错、注释、调优等。 USER 下面这段的代码的效率很低，且没有处理边界情况。请先解释这段代码的问题与解决方法，然后进行优化： ``` def fib(n): if n <= 2: return n return fib(n-1) + fib(n-2) ``` 8. 代码解

CHANGELOG =========================== http://www.spring.io Changes in version 3.2.15 (2015-10-15) ------------------------------------- protect against RFD exploits, see http://pivotal.io/security/cve-2015-5211 non-singleton beans (SPR-12250) improved error messages for MockRestServiceServer (SPR-12230) allow spring HTTP clients to enforce RFC 6265 (cookies in a single header) (SPR- 12196) fixed @Qualifier resolution test instance between TestNG test methods (SPR-11626) fixed If-Modified-Since header is parsed as HTTP-date; but IE 10 sends length (SPR- 11727) fixed unsafe fallback pointcut construction in AspectJExpressionPointcut

SPRING FRAMEWORK CHANGELOG =========================== http://www.spring.io Changes in version 3.2.16 (2015-12-17) ------------------------------------- fixed Jdbc4SqlXmlHandler should return null instead version 3.2.15 (2015-10-15) ------------------------------------- protect against RFD exploits, see http://pivotal.io/security/cve-2015-5211 (SPR- 13548) fixed whether HttpInputMessage.getBody() is allowed non-singleton beans (SPR-12250) improved error messages for MockRestServiceServer (SPR-12230) allow spring HTTP clients to enforce RFC 6265 (cookies in a single header) (SPR- 12196) fixed @Qualifier resolution

SPRING FRAMEWORK CHANGELOG =========================== http://www.spring.io Changes in version 3.2.18 (2016-12-21) ------------------------------------- fixed Constructor sets the source incorrectly in version 3.2.15 (2015-10-15) ------------------------------------- protect against RFD exploits, see http://pivotal.io/security/cve-2015-5211 (SPR- 13548) fixed whether HttpInputMessage.getBody() is allowed non-singleton beans (SPR-12250) improved error messages for MockRestServiceServer (SPR-12230) allow spring HTTP clients to enforce RFC 6265 (cookies in a single header) (SPR- 12196) fixed @Qualifier resolution

SPRING FRAMEWORK CHANGELOG =========================== http://www.spring.io Changes in version 3.2.17 (2016-05-06) ------------------------------------- fixed AbstractRequestLoggingFilter appends null version 3.2.15 (2015-10-15) ------------------------------------- protect against RFD exploits, see http://pivotal.io/security/cve-2015-5211 (SPR- 13548) fixed whether HttpInputMessage.getBody() is allowed non-singleton beans (SPR-12250) improved error messages for MockRestServiceServer (SPR-12230) allow spring HTTP clients to enforce RFC 6265 (cookies in a single header) (SPR- 12196) fixed @Qualifier resolution

SPRING FRAMEWORK CHANGELOG =========================== http://www.spring.io Changes in version 3.2.14 (2015-06-30) ------------------------------------- fixed disable DTD by default when parsing untrusted non-singleton beans (SPR-12250) improved error messages for MockRestServiceServer (SPR-12230) allow spring HTTP clients to enforce RFC 6265 (cookies in a single header) (SPR- 12196) fixed @Qualifier resolution test instance between TestNG test methods (SPR-11626) fixed If-Modified-Since header is parsed as HTTP-date; but IE 10 sends length (SPR- 11727) fixed unsafe fallback pointcut construction in AspectJExpressionPointcut

SPRING FRAMEWORK CHANGELOG =========================== http://www.spring.io Changes in version 3.2.13 (2014-12-30) ------------------------------------- fixed Java 8 bridge method handling can lead to non-singleton beans (SPR-12250) improved error messages for MockRestServiceServer (SPR-12230) allow spring HTTP clients to enforce RFC 6265 (cookies in a single header) (SPR- 12196) fixed @Qualifier resolution test instance between TestNG test methods (SPR-11626) fixed If-Modified-Since header is parsed as HTTP-date; but IE 10 sends length (SPR- 11727) fixed unsafe fallback pointcut construction in AspectJExpressionPointcut

SPRING FRAMEWORK CHANGELOG =========================== http://www.spring.io Changes in version 3.2.12 (2014-11-11) ------------------------------------- fixed directory traversal with static resource non-singleton beans (SPR-12250) improved error messages for MockRestServiceServer (SPR-12230) allow spring HTTP clients to enforce RFC 6265 (cookies in a single header) (SPR- 12196) fixed @Qualifier resolution test instance between TestNG test methods (SPR-11626) fixed If-Modified-Since header is parsed as HTTP-date; but IE 10 sends length (SPR- 11727) fixed unsafe fallback pointcut construction in AspectJExpressionPointcut

SPRING FRAMEWORK CHANGELOG =========================== http://www.springsource.org Changes in version 3.2.1 (2013-01-24) -------------------------------------- * SpEL support for static finals on interfaces properly works in combination with "completeAutoload" (SPR-10195) * Spring MVC Test framework supports HTTP OPTIONS method as well (SPR-10093) * MockHttpServletRequest's getParameter(Values) returns null for * improved regular expression for parsing query params (SPR-9832) * added mock implementations of Http[Input|Output]Message * MediaType's include method now recognizes wildcards in media types with a suffix

SPRING FRAMEWORK CHANGELOG =========================== http://www.spring.io Changes in version 3.2.10 (2014-07-15) ------------------------------------- restored backward compatibility in RestTemplate's test instance between TestNG test methods (SPR-11626) fixed If-Modified-Since header is parsed as HTTP-date; but IE 10 sends length (SPR- 11727) fixed unsafe fallback pointcut construction in AspectJExpressionPointcut properly works in combination with "completeAutoload" (SPR-10195) * Spring MVC Test framework supports HTTP OPTIONS method as well (SPR-10093) * MockHttpServletRequest's getParameter(Values) returns null for