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学编程必看:这些算法你掌握了吗?

许多初学软件开发的同学,认为学开发就是学各种编程语言,或者认为能学到最新的编程语言、技术和标准就是最牛叉的。其实这种认知是有失偏颇的。

 

全民快乐8BIANCHENGYUYANGURANZHONGYAO,DANSHIJISUANJISUANFAHELILUNGENGWEIZHONGYAO,YINWEIJISUANJIBIANCHENGYUYANHEKAIFAPINGTAIGENGXINDIEDAIRIXINYUEYI,DANWANBIANBULIQIZONGDESHINEIXIESUANFAHELILUN。


算法1算法——程序员的内功

 

XINGXIANGDIANBIYU:

 

SUANFA、SHUJUJIEGOU、BIANYIYUANLI、GUANXIXINGSHUJUKUYUANLIHEJISUANJITIXIJIEGOUDENGZHEIXIESUANFAHELILUNZHISHITIXISHUYUCHENGXUYUANDE“NEIGONG”。

 

全民快乐8GEZHONGGEYANGWUHUABAMENDEBIANCHENGYUYAN、JISHUHEBIAOZHUNZEGENGSHI“WAIGONG”。

 

ZHIHUIZHUIQIUZUIXINYUYAN,DONGXIEHUAJIAZIYONGLAIXUANYAO,QUEMEIYOUGUOYINGNEIGONGDECHENGXUYUAN,SHIBUKENENGCHENGWEIGAOSHOUDE。

 

算法内功高手

 

YEXUYOURENHUIWEN:“JINTIANJISUANJIZHEIMEKUAI,SUANFAHAIZHONGYAOMA?”

 

QISHIYONGYUANBUHUIYOUTAIKUAIDEJISUANJI,YINWEIWOMENZONGHUIXIANGCHUXINDEYINGYONG。

 

ZAIWANGLUOSHIDAI,XINXILIANGYUELAIYUEDA,YUELAIYUEDUODETIAOZHANXUYAOKAOZHUOYUEDESUANFALAIJIEJUE。

 

GUANYUCHENGXUYUANSHIFOUBIXUDONGSUANFADEWENTI,ITQUANLIUXINGDEZHEIYANGLIANGZHANGDONGTUZUYIJICHUDAAN:

 

A、DONGSUANFADECHENGXUYUAN:


懂算法的程序员

 

B、BUDONGSUANFADECHENGXUYUAN:

 

不懂算法的程序员


算法2如何学习算法?

 

一、看书

 

RUGUONISHIXIAOBAI,NILIANCHANGJIANDESHUJUJIEGOU,RULIANBIAO、SHUYIJICHANGJIANDESUANFASIXIANG,RUDIGUI、MEIJU、DONGTAIGUIHUAZHEIXIEDOUMEIXUEGUO,NEIME,JIANYINIXIANQUZHAOBENSHU,XIANBAZUIJICHUDEZHISHIGAODONG。

 

NIXUYAOGAODONGDEZUIJICHUDEZHISHIBAOKUO:

 

1、常见数据结构:链表、树(如二叉树)。

2、常见算法思想:贪婪法、分治法、穷举法、动态规划,回溯法。

 

全民快乐8ZHEILITUIJIANYIBENNENGBIJIAOXITONGDEXUEXISUANFADESHUJI:《SUANFADAOLUN》。

 04.jpg

 

ZHEIBENSHUSHENRUQIANCHU,QUANMIANXITONGDIJIESHAOLEJISUANJISUANFA。DUIMEIYIGESUANFADEFENXIJIYIYULIJIEYOUSHIFENYOUQU,BINGBAOCHILESHUXUEYANJINXING。

 

二、刷题

 

XUEXISUANFAYOUMEIYOUJIEJING?RUGUOSHUOYOU,NEIMEZHEIGEJIEJINGJIUSHIJIAOTASHIDIDUODONGSHOUQUSHUATI,DUOSHUATI。

 

全民快乐8ZAIZUOTIDESHIHOU,WOMENYAOZHUIQIUWANMEI,YAOLIQIUYITIDUOJIE。QIANWANBUYAOBAYIDAOTIZUOCHULAIZHIHOU,TIJIAOTONGGUO,RANHOUJIUGANJINXIAYIDAO。

 

RUGUOZIJISHIZAIXIANGBUCHULAIQITABANFALE,KEYIQUKANKANBIERENSHIZENMEZUODE,ZHIHOU,YUDAOLEISIDETI,NIJIUHUIGENGYOUSILU,GENGZHIDAOWANGNAGEFANGXIANGXIANG。QIANWANBUYAOJUEDEMOFANGBIERENDEZUOFASHIJIANDIURENDESHI。

 

KEYICONGJIANDANBAOLIRUSHOUZUOYIDAOTI,ZAIKAOLVKONGJIANYUSHIJIANZHIJIANDEHENGLIANG,YIDIANDIANQUYOUHUA。

 

全民快乐8DAOLIBUDUOSHUO,GANJINJUGELITI:

 

WENTI: YIZHIQINGWAYICIKEYITIAOSHANG1JITAIJIE,YEKEYITIAOSHANG2JI。QIUGAIQINGWATIAOSHANGYIGEnJIDETAIJIEZONGGONGYOUDUOSHAOZHONGTIAOFA?

 

▼FANGFAYI:BAOLIDIGUI


算法-暴力递归


ZHEIGEFANGFADESHIJIANFUZADUHENGAO,DADAOZHISHUJIBIELE。

 

▼FANGFAER:KONGJIANHUANSHIJIAN


算法-空间换时间

 

全民快乐8ZHEIGEYONGKONGJIANHUANSHIJIANDEFANGFAKEYIDADASUODUANSHIJIAN。

 

▼FANGFASAN:FEIBONEIQISHULIE


算法-斐波那契数列

 


ZHEIGEFANGFAKEYIBAKONGJIANFUZADUNONGDEGENGXIAO,BUXUYAOHashMapLAIBAOCUNZHUANGTAI。


算法3程序员必须掌握的五大基础实用算法

 

算法一:快速排序

 

KUAISUPAIXUSHIYOUDONGNI·HUOERSUOFAZHANDEYIZHONGPAIXUSUANFA。

 

全民快乐8ZAIPINGJUNZHUANGKUANGXIA,PAIXU n GEXIANGMUYAOΟ(n log n)CIBIJIAO。ZAIZUIHUAIZHUANGKUANGXIAZEXUYAOΟ(n2)CIBIJIAO,DANZHEIZHONGZHUANGKUANGBINGBUCHANGJIAN。SHISHISHANG,KUAISUPAIXUTONGCHANGMINGXIANBIQITAΟ(n log n) SUANFAGENGKUAI,YINWEITADENEIBUXUNHUAN(inner loop)KEYIZAIDABUFENDEJIAGOUSHANGHENYOUXIAOLVDIBEISHIXIANCHULAI。

 

全民快乐8KUAISUPAIXUSHIYONGFENZHIFA(Divide and conquer)CELVELAIBAYIGECHUANXING(list)FENWEILIANGGEZICHUANXING(sub-lists)。

 

算法二:堆排序算法

 

DUIPAIXU(Heapsort)SHIZHILIYONGDUIZHEIZHONGSHUJUJIEGOUSUOSHEJIDEYIZHONGPAIXUSUANFA。DUIJISHIYIGEJINSIWANQUANERCHASHUDEJIEGOU,BINGTONGSHIMANZUDUIJIDEXINGZHI:JIZIJIEDIANDEJIANZHIHUOSUOYINZONGSHIXIAOYU(HUOZHEDAYU)TADEFUJIEDIAN。

 

全民快乐8DUIPAIXUDEPINGJUNSHIJIANFUZADUWEIΟ(nlogn) 。

 

算法三:归并排序

 

GUIBINGPAIXU(Merge sort,TAIWANYIZUO:HEBINGPAIXU)SHIJIANLIZAIGUIBINGCAOZUOSHANGDEYIZHONGYOUXIAODEPAIXUSUANFA。GAISUANFASHICAIYONGFENZHIFA(Divide and Conquer)DEYIGEFEICHANGDIANXINGDEYINGYONG。

 

算法四:二分查找算法

 

ERFENCHAZHAOSUANFASHIYIZHONGZAIYOUXUSHUZUZHONGCHAZHAOMOUYITEDINGYUANSUDESOUSUOSUANFA。

 

全民快乐8SOUSUGUOCHENGCONGSHUZUDEZHONGJIANYUANSUKAISHI,RUGUOZHONGJIANYUANSUZHENGHAOSHIYAOCHAZHAODEYUANSU,ZESOU SUGUOCHENGJIESHU;RUGUOMOUYITEDINGYUANSUDAYUHUOZHEXIAOYUZHONGJIANYUANSU,ZEZAISHUZUDAYUHUOXIAOYUZHONGJIANYUANSUDENEIYIBANZHONGCHAZHAO,ERQIEGENKAISHIYIYANGCONGZHONGJIANYUANSUKAISHIBIJIAO。

 

RUGUOZAIMOUYIBUZHOUSHUZU WEIKONG,ZEDAIBIAOZHAOBUDAO。ZHEIZHONGSOUSUOSUANFAMEIYICIBIJIAODOUSHISOUSUOFANWEISUOXIAOYIBAN。ZHEBANSOUSUOMEICIBASOUSUOQUYUJIANSHAOYIBAN,SHIJIANFUZADUWEIΟ(logn) 。

 

算法五:BFPRT(线性查找算法)

 

BFPRTSUANFAJIEJUEDEWENTISHIFENJINGDIAN,JICONGMOUnGEYUANSUDEXULIEZHONGXUANCHUDIkDA(DIkXIAO)DEYUANSU,TONGGUOQIAOMIAODEFEN XI,BFPRTKEYIBAOZHENGZAIZUIHUAIQINGKUANGXIARENGWEIXIANXINGSHIJIANFUZADU。GAISUANFADESIXIANGYUKUAISUPAIXUSIXIANGXIANGSI,DANGRAN,WEISHIDESUANFAZAIZUIHUAIQINGKUANGXIA,YIRANNENGDADAOo(n)DESHIJIANFUZA DU,WUWEISUANFAZUOZHEZUOLEJINGMIAODECHULI。

 

算法图


算法4结束语:

 

全民快乐8SUANFASHICHENGXUYUANZAIZHUIQIUGAOSUDU,GAOXIAOLVDELUSHANGBUDEBUXUEDE“NEIGONG”,ERQIESUANFAJIHUSHISUOYOUDACHANGJISHUMIANSHIDEBIKAOXIANGMU。XUEHAOSUANFAHESHUJUJIEGOU,WULUNSHIYINGDUIDACHANGMIANSHI,HAISHIZHIYEZHANGYUANGUIHUA,SHENZHIDUIZIJIDELUOJINENGLIDETISHENG,DOUYOUJIDADEBANGZHU。

 

全民快乐8XIAOHUOBANMEN,RUGUONINENGNAIXINKANDAOZHEILI,BINGQIENENGDAGAIKANDONGBENWENDE50%DENEIRONG,NEIME,GONGXINI!NIYIJINGZOUZAICHENGWEICHENGXUYUANDELUSHANGLE,NIKEYIXUANZEZIXUEHUOCANJIAZHIYEPEIXUN。

 

全民快乐8RUGUONIKANBUTAIDONG,DANDUIZHEIXIEGANXINGQU,MEIGUANXI,KEYIZHAOYIJIAYOUZIZHIDEZHUANYEDEZHENDUILINGJICHUDEITZHIYEPEIXUNXUEXIAO,RANGLAOSHISHOUBASHOUJIAONICONGLINGXUEQI。

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全民快乐8

全民快乐8

全民快乐8