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you hua Perl zha qu dai ma de zui da xing neng

2008-05-19 06:25:39 编辑來源:互联网 评论
 
 
 
本文为【优化Perl榨取代码的最大性能】的拼音翻译版
  Perl shi yi men fei chang ling huo de yu yan , ran er , qi yi yong te xing hui shi cheng xu yuan zi sheng chu yi zhong lan san de bian cheng xi guan 。 wo men ying gai dui zhe xie huai xi guan fu ze , tong shi ke yi cai qu yi xie kuai jie bu zhou lai ti gao Perl ying yong cheng xu de xing neng 。 zai ben wen zhong , wo men jiang jie shao you hua de yi xie guan jian nei rong , le jie na xie jie jue fang an you xiao 、 na xie wu xiao , yi ji ru he ji xu gou jian bing kuo zhan she ji shi jiu kao lv dao you hua he su du de ying yong cheng xu 。
  zhuo lie de xing neng yuan zi cao lv de bian cheng
  tan lv di shuo , wo xi huan Perl, er qie dao chu shi yong Perl。 wo yi jing shi yong Perl kai fa le hen duo Web zhan dian , bian xie le hen duo guan li jiao ben , bing bian xie le yi xie you xi 。 tong chang shi yong Perl shi wei le jie sheng shi jian , bing wei wo zi dong jian cha yi xie xin xi : cong cai piao hao ma dao gu piao jia ge , wo shen zhi shi yong Perl lai zi dong bian xie you jian 。 you yu shi yong Perl rang yi qie dou bian de ru ci jian dan , yin ci hen rong yi wang ji dui qi jin xing you hua 。 xu duo qing kuang xia , zhe bing bu shi shi jie mo ri 。 yin ci duo hua ji ge hao miao lai cha xun gu piao jia ge huo chu li ri zhi wen jian you you shen me guan xi ne ?
  ran er , zhe xie xiang tong de lan duo xi guan zai xiao cheng xu zhong ke neng zhi shi duo hua fei ji hao miao de shi jian , dan shi zai da gui mo kai fa xiang mu zhong , duo hao fei de shi jian jiu bian cheng shu bei le 。 zhe jiu shi Perl de TMTOWTDI (There's More Than One Way To Do It) song ge kai shi bian huai de di fang 。 ru guo nin xu yao hen kuai de su du , bu guan you duo shao zhong man su de fang fa , dan shi ke neng zhi you yi liang zhong fang fa ke yi da dao zui kuai de jie guo 。 zui zhong , ji shi nin ke yi de dao yu qi de jie guo , dan cao lv de bian cheng huan shi hui dao zhi zhuo lie de xing neng 。 yin ci , zai ben wen zhong , wo men jiang jie shao yi xie ke yi yong lai qu xiao Perl ying yong cheng xu e wai zhi xing zhou qi de guan jian ji shu 。
  you hua fang fa
  shou xian , you bi yao sui shi ji zhu Perl shi yi men bian yi yu yan cheng xu 。 nin suo bian xie de yuan dai ma shi zhuan huan wei zhi xing de zi jie ma shi jin xing bian yi de 。 zi jie ma ben shen jiu you yi ge zhi ling fan wei , suo you de zhi ling dou shi shi yong gao du you hua de C yu yan bian xie de 。 ran er , ji shi zai zhe xie zhi ling zhong , you xie cao zuo reng ran ke yi jin xing you hua , de dao xiang tong de jie guo , dan shi zhi xing de xiao lv geng gao 。 zong ti lai jiang , zhe yi wei zhe nin yao shi yong luo ji xu lie yu zi jie ma de zu he , hou zhe shi cong qian zhe zhong sheng cheng de , zui zhong hui ying xiang xing neng 。 mou xie xiang si cao zuo zhi jian xing neng de cha ju ke neng fei chang ju da 。 xian zai rang wo men kao lv qing dan 1 he qing dan 2 zhong de dai ma 。 zhe liang duan dai ma dou shi jiang liang ge zi fu chuan lian jie wei yi ge zi fu chuan , yi ge shi tong guo pu tong de lian jie fang fa shi xian , er ling wai yi ge shi tong guo sheng cheng yi ge shu zu bing shi yong join fang fa jin xing lian jie 。
  qing dan 1. lian jie zi fu chuan , ban ben 1
  my $string = 'abcdefghijklmnopqrstuvwxyz';
  my $concat = '';
  foreach my $count (1..999999)
  {
  $concat .= $string;
  }
  qing dan 2. lian jie zi fu chuan , ban ben 2
  my $string = 'abcdefghijklmnopqrstuvwxyz';
  my @concat;
  foreach my $count (1..999999)
  {
  push @concat,$string;
  }
  my $concat = join('',@concat);
  zhi xing qing dan 1 xu yao 1.765 miao , er zhi xing qing dan 2 ze xu yao 5.244 miao 。 zhe liang duan dai ma dou sheng cheng yi ge zi fu chuan , na me shi shen me cao zuo hao fei le zhe me duo shi jian ne ? chuan tong shang jiang ( bao kuo Perl kai fa zu ), wo men dou ren wei lian jie zi fu chuan shi yi ge fei chang hao shi de guo cheng , yin wei wo men xu yao wei bian liang kuo zhan nei cun , ran hou jiang zi fu chuan ji xin tian jia de nei rong fu zhi dao xin de bian liang zhong 。 ling yi fang mian , xiang yi ge shu zu zhong tian jia yi ge zi fu chuan ying gai fei chang jian dan 。 wo men huan tian jia le shi yong join() fu zhi lian jie zi fu chuan de wen ti , zhe hui e wai zeng jia 1 miao de shi jian 。
  zhe zhong qing kuang xia de wen ti zai yu , jiang zi fu chuan push() dao yi ge zi fu chuan zhong fei chang hao shi ; shou xian , wo men yao zhi xing yi ci han shu tiao yong ( zhe hui she ji ya zhan he chu zhan cao zuo ), huan yao tian jia e wai de shu zu guan li gong zuo 。 xiang fan , lian jie zi fu chuan cao zuo fei chang jian dan , zhi shi yun xing yi ge cao zuo ma , jiang yi ge zi fu chuan bian liang fu jia dao yi ge xian you de zi fu chuan bian liang zhong ji ke 。 ji shi she zhi shu zu de da xiao lai jian shao qi ta gong zuo de fu zai ( shi yong $#concat = 999999), ye zhi neng jie sheng 1 miao zhong de shi jian 。
  shang mian zhe ge li zi shi fei chang ji duan de yi ge li zi , zai shi yong shu zu shi , su du ke yi bi shi yong zi fu chuan kuai shu bei ; ru guo xu yao chong yong yi ge te ding de xu lie , dan yao shi yong bu tong de ci xu huo bu tong de kong ge zi fu , na me zhe jiu shi hen hao de yi ge li zi 。 dang ran , ru guo xiang chong xin pai lie xu lie de nei rong , na me shu zu ye fei chang you yong 。 shun bian shuo yi xia , zai zhe ge li zi zhong , chan sheng yi ge chong fu 999,999 ci zi fu de zi fu chuan de geng jian bian fang fa shi :
  $concat = 999999 x 'abcdefghijklmnopqrstuvwxyz';
  zhe li jie shao de hen duo ji shu dan du shi yong dou bu hui yin qi duo da de cha yi , dan shi dang nin zai ying yong cheng xu zhong zu he shi yong zhe xie ji shu shi , jiu ke yi zai Perl ying yong cheng xu zhong jie sheng ji bai hao miao de shi jian , shen zhi shi ji miao de shi jian 。
  shi yong yin yong
  ru guo shi yong da xing shu zu huo hash biao , bing shi yong ta men zuo wei han shu de shen shu , na me ying gai shi yong ta men de yi ge yin yong , er bu ying gai zhi jie shi yong ta men 。 tong guo shi yong yin yong , ke yi gao su han shu zhi xiang xin xi de zhi zhen 。 ru guo bu shi yong yin yong , jiu xu yao jiang zheng ge shu zu huo hash biao fu zhi dao gai han shu de tiao yong zhan zhong , ran hou zai han shu zhong zai ci dui qi jin xing fu zhi 。 yin yong huan ke yi jie sheng nei cun ( zhe ke yi jian shao zu ji he guan li de fu zai ), bing jian hua nin de bian cheng 。
  zi fu chuan chu li
  ru guo zai cheng xu zhong shi yong le da liang de jing tai zi fu chuan , li ru , zai Web ying yong cheng xu zhong , na me jiu yao ji de shi yong dan yin hao , er bu shi shi yong shuang yin hao 。 shuang yin hao hui qiang zhi Perl jian cha ke neng cha ru de xin xi , zhe hui zeng jia da yin zi fu chuan de fu zai :
  print 'A string','another string',"\n";
  wo shi yong dou hao lai fen ge shen shu , er bu shi shi yong ju hao jiang zhe xie zi fu chuan lian jie zai yi qi 。 zhe yang ke yi jian hua chu li guo cheng ;print zhi shi jian dan di xiang shu chu wen jian fa song yi ge shen shu 。 lian jie cao zuo hui shou xian jiang zi fu chuan lian jie zai yi qi , ran hou jiang qi zuo wei yi ge shen shu da yin 。
  xun huan
  zheng ru nin yi jing kan dao de yi yang , dai you shen shu de han shu tiao yong de kai xiao hen gao , yin wei yao xiang rang han shu tiao yong zheng chang gong zuo ,Perl zhi neng jiang zhe xie shen shu ya ru tiao yong dui zhan zhi hou , zai tiao yong han shu , ran hou cong dui zhan zhong zai ci jie shou xiang ying 。 suo you zhe xie cao zuo dou xu yao jin bi mian wo men bu xu yao de fu zai he chu li cao zuo 。 you yu zhe ge yuan yin , zai yi ge xun huan zhong shi yong tai duo han shu tiao yong bu shi ge hao zhu yi 。 tong yang , zhe jian shao le bi jiao de ci shu 。 xun huan 1,000 ci bing xiang han shu chuan di xin xi hui dao zhi tiao yong gai han shu 1,000 ci 。 yao jie jue zhe ge wen ti , zhi xu yao tiao zheng yi xia dai ma de shun xu ji ke 。 wo men bu shi yong qing dan 3 de ge shi , er shi shi yong qing dan 4 zhong de ge shi 。
  qing dan 3. xun huan tiao yong han shu
  foreach my $item (keys %{$values})
  {
  $values-{$item}-{result} = calculate($values-{$item});
  }
  sub calculate
  {
  my ($item) = @_;
  return ($item-{adda}+$item-{addb});
  }
  qing dan 4. han shu shi yong xun huan
  calculate_list($values);
  sub calculate_list
  {
  my ($list) = @_;
  foreach my $item (keys %{$values})
  {
  $values-{$item}-{result} = ($item-{adda}+$item-{addb});
  }
  }
  geng hao de fang shi shi zai zhe zhong jian dan de ji suan zhong huo zhe zai jian dan de xun huan zhong shi yong map:
  map { $values-{$_}-{result} = $values-{$_}-{adda}+$values-{$_}-{addb} } keys %{$values};
  huan yao ji zhu de shi , zai xun huan zhong , mei ci fan fu dou shi zai lang fei shi jian , yin ci bu yao duo ci shi yong xiang tong de xun huan , er shi yao jin liang zai yi ge xun huan zhong zhi xing suo you de cao zuo 。
  pai xu
  ling wai yi zhong you guan xun huan de tong yong cao zuo shi pai xu , te bie shi dui hash biao zhong de jian zhi jin xing pai xu 。 zai zhe ge li zi zhong qian ru dui lie biao yuan su jin xing pai xu de cao zuo shi fei chang you ren de , ru qing dan 5 suo shi 。
  qing dan 5. bu hao de pai xu
  my @marksorted = sort {sprintf('%s%s%s',
  $marked_items-{$b}-{'upddate'},
  $marked_items-{$b}-{'updtime'},
  $marked_items-{$a}-{itemid})
  sprintf('%s%s%s',
  $marked_items-{$a}-{'upddate'},
  $marked_items-{$a}-{'updtime'},
  $marked_items-{$a}-{itemid}) } keys %{$marked_items};
  zhe shi yi ge dian xing de fu duo shu ju pai xu cao zuo , zai gai li zhong , yao dui ri qi 、 shi jian he ID hao jin xing pai xu , zhe shi tong guo jiang shu zi lian jie zai yi ge shu zi shang , ran hou dui qi jin xing shu zi pai xu shi xian de 。 wen ti shi pai xu cao zuo yao bian li lie biao yuan su , bing gen ju bi jiao cao zuo shang xia yi dong lie biao 。 zhe shi yi zhong lei xing de pai xu , dan shi yu wo men yi jing kan dao de pai xu de li zi bu tong , ta dui mei ci bi jiao cao zuo dou tiao yong sprintf。 mei ci xun huan zhi shao zhi xing liang ci , bian li lie biao xu yao zhi xing de jing que xun huan ci shu qu jue yu lie biao zui chu pai xu de qing kuang 。 li ru , dui yu yi ge 10,000 ge yuan su de lie biao lai shuo , nin ke neng hui tiao yong sprintf chao guo 240,000 ci 。
  jie jue fang an shi chuang jian yi ge bao han pai xu xin xi de lie biao , bing zhi sheng cheng yi ci pai xu yu xin xi 。 shen kao qing dan 5 zhong de li zi , wo jiang zhe duan dai ma gai xie wei qing dan 6 de dai ma 。
  qing dan 6. jiao hao de pai xu
  map { $marked_items-{$_}-{sort} = sprintf('%s%s%s',
  $marked_items-{$_}-{'upddate'},
  $marked_items-{$_}-{'updtime'},
  $marked_items-{$_}-{itemid}) } keys %{$marked_items};
  my @marksorted = sort { $marked_items-{$b}-{sort}
  $marked_items-{$a}-{sort} } keys %{$marked_items};
  xian zai bu xu yao mei ci dou tiao yong sprintf, dui hash biao zhong de mei yi xiang , zhi xu yao tiao yong yi ci gai han shu , jiu ke yi zai hash biao zhong sheng cheng yi ge pai xu zi duan , ran hou zai pai xu shi jiu ke yi shi yong zhe ge pai xu zi duan le 。 pai xu cao zuo zhi neng fang wen pai xu zi duan de zhi 。 nin ke yi jiang dui bao han 10,000 ge yuan su de hash biao de tiao yong cong 240,000 ci jian shao dao 10,000 ci 。 zhe qu jue yu zui chu dui pai xu bu fen zhi xing de cao zuo , dan shi ru guo shi yong qing dan 6 zhong de fang fa , ze ke neng jie sheng yi ban de shi jian 。
  ru guo shi yong cong shu ju ku ( li ru MySQL huo lei si de shu ju ku ) cha xun de jie guo lai gou jian hash biao , bing zai cha xun zhong shi yong shi yong pai xu cao zuo , ran hou an zhao zhe ge shun xu lai gou jian hash biao , na me jiu wu xu zai ci bian li zhe xie xin xi lai jin xing pai xu 。
  shi yong jian duan de luo ji
  yu pai xu xiang guan de shi ru he bian li ke xuan zhi lie biao 。 shi yong hen duo if yu ju hao fei de shi jian ke neng hui ling ren nan yi zhi xin 。 li ru , qing shen yue qing dan 7 zhong de dai ma 。
  qing dan 7. jin xing xuan ze
  if ($userchoice 0)
  {
  $realchoice = $userchoice;
  }
  【原文】【汉音对照
 
 
 
 
 
 
 
 
 
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  Perl shi yi men fei chang ling huo de yu yan , ran er , qi yi yong te xing hui shi cheng xu yuan zi sheng chu yi zhong lan san de bian cheng xi guan 。 wo men ying gai dui zhe xie huai xi guan fu ze , tong shi ke yi cai qu yi xie kuai jie bu zhou lai ti gao Perl ying yong cheng xu de xing neng 。 zai ben wen zhong , wo men jiang jie shao you hua de yi xie guan jian nei rong , le jie na xie jie jue fang an you xiao 、 na xie wu xiao , yi ji ru he ji xu gou jian bing kuo zhan she ji shi jiu kao lv dao you hua he su du de ying yong cheng xu 。    zhuo lie de xing neng yuan zi cao lv de bian cheng    tan lv di shuo , wo xi huan Perl, er qie dao chu shi yong Perl。 wo yi jing shi yong Perl kai fa le hen duo Web zhan dian , bian xie le hen duo guan li jiao ben , bing bian xie le yi xie you xi 。 tong chang shi yong Perl shi wei le jie sheng shi jian , bing wei wo zi dong jian cha yi xie xin xi : cong cai piao hao ma dao gu piao jia ge , wo shen zhi shi yong Perl lai zi dong bian xie you jian 。 you yu shi yong Perl rang yi qie dou bian de ru ci jian dan , yin ci hen rong yi wang ji dui qi jin xing you hua 。 xu duo qing kuang xia , zhe bing bu shi shi jie mo ri 。 yin ci duo hua ji ge hao miao lai cha xun gu piao jia ge huo chu li ri zhi wen jian you you shen me guan xi ne ?    ran er , zhe xie xiang tong de lan duo xi guan zai xiao cheng xu zhong ke neng zhi shi duo hua fei ji hao miao de shi jian , dan shi zai da gui mo kai fa xiang mu zhong , duo hao fei de shi jian jiu bian cheng shu bei le 。 zhe jiu shi Perl de TMTOWTDI (There's More Than One Way To Do It) song ge kai shi bian huai de di fang 。 ru guo nin xu yao hen kuai de su du , bu guan you duo shao zhong man su de fang fa , dan shi ke neng zhi you yi liang zhong fang fa ke yi da dao zui kuai de jie guo 。 zui zhong , ji shi nin ke yi de dao yu qi de jie guo , dan cao lv de bian cheng huan shi hui dao zhi zhuo lie de xing neng 。 yin ci , zai ben wen zhong , wo men jiang jie shao yi xie ke yi yong lai qu xiao Perl ying yong cheng xu e wai zhi xing zhou qi de guan jian ji shu 。    you hua fang fa    shou xian , you bi yao sui shi ji zhu Perl shi yi men bian yi yu yan cheng xu 。 nin suo bian xie de yuan dai ma shi zhuan huan wei zhi xing de zi jie ma shi jin xing bian yi de 。 zi jie ma ben shen jiu you yi ge zhi ling fan wei , suo you de zhi ling dou shi shi yong gao du you hua de C yu yan bian xie de 。 ran er , ji shi zai zhe xie zhi ling zhong , you xie cao zuo reng ran ke yi jin xing you hua , de dao xiang tong de jie guo , dan shi zhi xing de xiao lv geng gao 。 zong ti lai jiang , zhe yi wei zhe nin yao shi yong luo ji xu lie yu zi jie ma de zu he , hou zhe shi cong qian zhe zhong sheng cheng de , zui zhong hui ying xiang xing neng 。 mou xie xiang si cao zuo zhi jian xing neng de cha ju ke neng fei chang ju da 。 xian zai rang wo men kao lv qing dan 1 he qing dan 2 zhong de dai ma 。 zhe liang duan dai ma dou shi jiang liang ge zi fu chuan lian jie wei yi ge zi fu chuan , yi ge shi tong guo pu tong de lian jie fang fa shi xian , er ling wai yi ge shi tong guo sheng cheng yi ge shu zu bing shi yong join fang fa jin xing lian jie 。    qing dan 1. lian jie zi fu chuan , ban ben 1   my $string = 'abcdefghijklmnopqrstuvwxyz';   my $concat = '';   foreach my $count (1..999999)   {   $concat .= $string;   }    qing dan 2. lian jie zi fu chuan , ban ben 2   my $string = 'abcdefghijklmnopqrstuvwxyz';   my @concat;   foreach my $count (1..999999)   {   push @concat,$string;   }   my $concat = join('',@concat);    zhi xing qing dan 1 xu yao 1.765 miao , er zhi xing qing dan 2 ze xu yao 5.244 miao 。 zhe liang duan dai ma dou sheng cheng yi ge zi fu chuan , na me shi shen me cao zuo hao fei le zhe me duo shi jian ne ? chuan tong shang jiang ( bao kuo Perl kai fa zu ), wo men dou ren wei lian jie zi fu chuan shi yi ge fei chang hao shi de guo cheng , yin wei wo men xu yao wei bian liang kuo zhan nei cun , ran hou jiang zi fu chuan ji xin tian jia de nei rong fu zhi dao xin de bian liang zhong 。 ling yi fang mian , xiang yi ge shu zu zhong tian jia yi ge zi fu chuan ying gai fei chang jian dan 。 wo men huan tian jia le shi yong join() fu zhi lian jie zi fu chuan de wen ti , zhe hui e wai zeng jia 1 miao de shi jian 。    zhe zhong qing kuang xia de wen ti zai yu , jiang zi fu chuan push() dao yi ge zi fu chuan zhong fei chang hao shi ; shou xian , wo men yao zhi xing yi ci han shu tiao yong ( zhe hui she ji ya zhan he chu zhan cao zuo ), huan yao tian jia e wai de shu zu guan li gong zuo 。 xiang fan , lian jie zi fu chuan cao zuo fei chang jian dan , zhi shi yun xing yi ge cao zuo ma , jiang yi ge zi fu chuan bian liang fu jia dao yi ge xian you de zi fu chuan bian liang zhong ji ke 。 ji shi she zhi shu zu de da xiao lai jian shao qi ta gong zuo de fu zai ( shi yong $#concat = 999999), ye zhi neng jie sheng 1 miao zhong de shi jian 。    shang mian zhe ge li zi shi fei chang ji duan de yi ge li zi , zai shi yong shu zu shi , su du ke yi bi shi yong zi fu chuan kuai shu bei ; ru guo xu yao chong yong yi ge te ding de xu lie , dan yao shi yong bu tong de ci xu huo bu tong de kong ge zi fu , na me zhe jiu shi hen hao de yi ge li zi 。 dang ran , ru guo xiang chong xin pai lie xu lie de nei rong , na me shu zu ye fei chang you yong 。 shun bian shuo yi xia , zai zhe ge li zi zhong , chan sheng yi ge chong fu 999,999 ci zi fu de zi fu chuan de geng jian bian fang fa shi :   $concat = 999999 x 'abcdefghijklmnopqrstuvwxyz';    zhe li jie shao de hen duo ji shu dan du shi yong dou bu hui yin qi duo da de cha yi , dan shi dang nin zai ying yong cheng xu zhong zu he shi yong zhe xie ji shu shi , jiu ke yi zai Perl ying yong cheng xu zhong jie sheng ji bai hao miao de shi jian , shen zhi shi ji miao de shi jian 。    shi yong yin yong    ru guo shi yong da xing shu zu huo hash biao , bing shi yong ta men zuo wei han shu de shen shu , na me ying gai shi yong ta men de yi ge yin yong , er bu ying gai zhi jie shi yong ta men 。 tong guo shi yong yin yong , ke yi gao su han shu zhi xiang xin xi de zhi zhen 。 ru guo bu shi yong yin yong , jiu xu yao jiang zheng ge shu zu huo hash biao fu zhi dao gai han shu de tiao yong zhan zhong , ran hou zai han shu zhong zai ci dui qi jin xing fu zhi 。 yin yong huan ke yi jie sheng nei cun ( zhe ke yi jian shao zu ji he guan li de fu zai ), bing jian hua nin de bian cheng 。    zi fu chuan chu li    ru guo zai cheng xu zhong shi yong le da liang de jing tai zi fu chuan , li ru , zai Web ying yong cheng xu zhong , na me jiu yao ji de shi yong dan yin hao , er bu shi shi yong shuang yin hao 。 shuang yin hao hui qiang zhi Perl jian cha ke neng cha ru de xin xi , zhe hui zeng jia da yin zi fu chuan de fu zai :   print 'A string','another string',"\n";    wo shi yong dou hao lai fen ge shen shu , er bu shi shi yong ju hao jiang zhe xie zi fu chuan lian jie zai yi qi 。 zhe yang ke yi jian hua chu li guo cheng ;print zhi shi jian dan di xiang shu chu wen jian fa song yi ge shen shu 。 lian jie cao zuo hui shou xian jiang zi fu chuan lian jie zai yi qi , ran hou jiang qi zuo wei yi ge shen shu da yin 。    xun huan    zheng ru nin yi jing kan dao de yi yang , dai you shen shu de han shu tiao yong de kai xiao hen gao , yin wei yao xiang rang han shu tiao yong zheng chang gong zuo ,Perl zhi neng jiang zhe xie shen shu ya ru tiao yong dui zhan zhi hou , zai tiao yong han shu , ran hou cong dui zhan zhong zai ci jie shou xiang ying 。 suo you zhe xie cao zuo dou xu yao jin bi mian wo men bu xu yao de fu zai he chu li cao zuo 。 you yu zhe ge yuan yin , zai yi ge xun huan zhong shi yong tai duo han shu tiao yong bu shi ge hao zhu yi 。 tong yang , zhe jian shao le bi jiao de ci shu 。 xun huan 1,000 ci bing xiang han shu chuan di xin xi hui dao zhi tiao yong gai han shu 1,000 ci 。 yao jie jue zhe ge wen ti , zhi xu yao tiao zheng yi xia dai ma de shun xu ji ke 。 wo men bu shi yong qing dan 3 de ge shi , er shi shi yong qing dan 4 zhong de ge shi 。    qing dan 3. xun huan tiao yong han shu   foreach my $item (keys %{$values})   {   $values-{$item}-{result} = calculate($values-{$item});   }   sub calculate   {   my ($item) = @_;   return ($item-{adda}+$item-{addb});   }    qing dan 4. han shu shi yong xun huan   calculate_list($values);   sub calculate_list   {   my ($list) = @_;   foreach my $item (keys %{$values})   {   $values-{$item}-{result} = ($item-{adda}+$item-{addb});   }   }    geng hao de fang shi shi zai zhe zhong jian dan de ji suan zhong huo zhe zai jian dan de xun huan zhong shi yong map:   map { $values-{$_}-{result} = $values-{$_}-{adda}+$values-{$_}-{addb} } keys %{$values};    huan yao ji zhu de shi , zai xun huan zhong , mei ci fan fu dou shi zai lang fei shi jian , yin ci bu yao duo ci shi yong xiang tong de xun huan , er shi yao jin liang zai yi ge xun huan zhong zhi xing suo you de cao zuo 。    pai xu    ling wai yi zhong you guan xun huan de tong yong cao zuo shi pai xu , te bie shi dui hash biao zhong de jian zhi jin xing pai xu 。 zai zhe ge li zi zhong qian ru dui lie biao yuan su jin xing pai xu de cao zuo shi fei chang you ren de , ru qing dan 5 suo shi 。    qing dan 5. bu hao de pai xu   my @marksorted = sort {sprintf('%s%s%s',   $marked_items-{$b}-{'upddate'},   $marked_items-{$b}-{'updtime'},   $marked_items-{$a}-{itemid})   sprintf('%s%s%s',   $marked_items-{$a}-{'upddate'},   $marked_items-{$a}-{'updtime'},   $marked_items-{$a}-{itemid}) } keys %{$marked_items};    zhe shi yi ge dian xing de fu duo shu ju pai xu cao zuo , zai gai li zhong , yao dui ri qi 、 shi jian he ID hao jin xing pai xu , zhe shi tong guo jiang shu zi lian jie zai yi ge shu zi shang , ran hou dui qi jin xing shu zi pai xu shi xian de 。 wen ti shi pai xu cao zuo yao bian li lie biao yuan su , bing gen ju bi jiao cao zuo shang xia yi dong lie biao 。 zhe shi yi zhong lei xing de pai xu , dan shi yu wo men yi jing kan dao de pai xu de li zi bu tong , ta dui mei ci bi jiao cao zuo dou tiao yong sprintf。 mei ci xun huan zhi shao zhi xing liang ci , bian li lie biao xu yao zhi xing de jing que xun huan ci shu qu jue yu lie biao zui chu pai xu de qing kuang 。 li ru , dui yu yi ge 10,000 ge yuan su de lie biao lai shuo , nin ke neng hui tiao yong sprintf chao guo 240,000 ci 。    jie jue fang an shi chuang jian yi ge bao han pai xu xin xi de lie biao , bing zhi sheng cheng yi ci pai xu yu xin xi 。 shen kao qing dan 5 zhong de li zi , wo jiang zhe duan dai ma gai xie wei qing dan 6 de dai ma 。    qing dan 6. jiao hao de pai xu   map { $marked_items-{$_}-{sort} = sprintf('%s%s%s',   $marked_items-{$_}-{'upddate'},   $marked_items-{$_}-{'updtime'},   $marked_items-{$_}-{itemid}) } keys %{$marked_items};   my @marksorted = sort { $marked_items-{$b}-{sort}   $marked_items-{$a}-{sort} } keys %{$marked_items};    xian zai bu xu yao mei ci dou tiao yong sprintf, dui hash biao zhong de mei yi xiang , zhi xu yao tiao yong yi ci gai han shu , jiu ke yi zai hash biao zhong sheng cheng yi ge pai xu zi duan , ran hou zai pai xu shi jiu ke yi shi yong zhe ge pai xu zi duan le 。 pai xu cao zuo zhi neng fang wen pai xu zi duan de zhi 。 nin ke yi jiang dui bao han 10,000 ge yuan su de hash biao de tiao yong cong 240,000 ci jian shao dao 10,000 ci 。 zhe qu jue yu zui chu dui pai xu bu fen zhi xing de cao zuo , dan shi ru guo shi yong qing dan 6 zhong de fang fa , ze ke neng jie sheng yi ban de shi jian 。    ru guo shi yong cong shu ju ku ( li ru MySQL huo lei si de shu ju ku ) cha xun de jie guo lai gou jian hash biao , bing zai cha xun zhong shi yong shi yong pai xu cao zuo , ran hou an zhao zhe ge shun xu lai gou jian hash biao , na me jiu wu xu zai ci bian li zhe xie xin xi lai jin xing pai xu 。    shi yong jian duan de luo ji    yu pai xu xiang guan de shi ru he bian li ke xuan zhi lie biao 。 shi yong hen duo if yu ju hao fei de shi jian ke neng hui ling ren nan yi zhi xin 。 li ru , qing shen yue qing dan 7 zhong de dai ma 。    qing dan 7. jin xing xuan ze   if ($userchoice 0)   {   $realchoice = $userchoice;   }   
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