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a.txt中有20行随机产生的数列,如下: 2928326128601232462131283250710027308938740594716691200992050511576 5352129649530193383124730478244772348721985707222557212265817305 217141333532296179938475175265792931789219830308392472584606305 2371620291160322081050531817416284225477019123161801285941026814244 283929972304551060318886921731765136928849135391662294051194618754 1809165929787147057932949630411324311737224509104016550662932273 27396236084901303873154718299242931819623155304661177528921164510335 254221462410491137971033914630292752245114969186002809930190939425 1085287492160525651862932475207612387312368408826675135332406418337 2567810118246621010283281198810903279355871571118961177731143829148 23727111515524141721964179351992331180134926914198081871053303186 378579502856625703213542353218420835730692264021219729654278515442 30215186011014395001656818458819061824708536511543271701327524725 223702764213159156022932717903282522044350522584222768193271431422354 3079720530119542370417125702274761144023302102641160114921224469221 15642298214000242538839193816839550322381321993212316517861828002 13042178002978222022331319116624809338275899045263351248023569 11252165681825711849278422768716060438517976169102391532289954712000 105084292396529699311371735329685626410510259482788519645152723476 29674179062831103792824121564178225289202161443911094228581583531951 要求通过纯批处理按照数列的大小顺序,正序输出如下: 13042178002978222022331319116624809338275899045263351248023569 217141333532296179938475175265792931789219830308392472584606305 1809165929787147057932949630411324311737224509104016550662932273 5352129649530193383124730478244772348721985707222557212265817305 15642298214000242538839193816839550322381321993212316517861828002 23727111515524141721964179351992331180134926914198081871053303186 30215186011014395001656818458819061824708536511543271701327524725 105084292396529699311371735329685626410510259482788519645152723476 254221462410491137971033914630292752245114969186002809930190939425 283929972304551060318886921731765136928849135391662294051194618754 378579502856625703213542353218420835730692264021219729654278515442 1085287492160525651862932475207612387312368408826675135332406418337 2371620291160322081050531817416284225477019123161801285941026814244 2567810118246621010283281198810903279355871571118961177731143829148 2928326128601232462131283250710027308938740594716691200992050511576 3079720530119542370417125702274761144023302102641160114921224469221 11252165681825711849278422768716060438517976169102391532289954712000 27396236084901303873154718299242931819623155304661177528921164510335 29674179062831103792824121564178225289202161443911094228581583531951 223702764213159156022932717903282522044350522584222768193271431422354 每行的数值都远远超过了cmd所能计算的最大数值。 要求,正确输出,不生成临时文件,代码高效通用。完成题目,视思路加分。 batman: 先说明下思路: 此题确实是出给我们的一大难题,为什么这要说呢?楼主要求的是文本内所有超大数值的排序, 所有的数值都远远超过了cmd所能运算的最大数值,用常规的比较法都是行不通的这是难点之一; 第二这些数值是随机生成的且字符总数不定,甚至可能达到数行和数十行之长,如采用逐字符判断 的方法来确实行最大字符数,效率将会是此类方案所无法逾越的障碍;第三楼主要求不生成临时文 件,这对用findstr /o来获取行最大字符的方案来讲,无疑是锁上了大门。 综上所述总结如下: 代码要通用就要获取行最大字符数,一种方法是逐字符法,用逐字符法效率上就存在很大问题; 第二种方法是使用findstr /o一次性获取每行字符偏移量,再通过处理获得行最大字符数,效率上比 逐字符法是高多了,但因为单用findstr /o是不能获得文本行未行字符偏移量的,必须要对未行强加 回车,在不破坏原文件的情况下就要用到临时文件。 而我们写代码时一般遵循四条原则:高效率、通用、简洁、尽量不生成临时文件,其中首要的 一条就是高效,其次是通用,至于简洁和有无临时文件都不是主要考虑因素,所以依此主次关系我 给出以下两种方案: 一、通用性差一点(数值字符都在一行内是绝对没问题的),效率高,代码简洁,无临时文件: @echo off&setlocal enabledelayedexpansion for /l %%i in (1,1,80) do set "kong=!kong!#" for /f %%i in (1.txt) do ( set "str=%%i%kong%" set "a=!str:~,80!" set "a=!a:%%i=!" set "_!a!%%i=a" ) for /f "delims==_" %%i in ('set _') do ( set "str=%%i" echo !str:#=! ) pause>nul 二、通用性极高,效率一般,生成临时文件,代码较复杂: 复制代码 代码如下: @echo off&setlocal enabledelayedexpansion set "max=0"&set "a=0" for /f %%i in (1.txt) do echo %%i>>2.txt echo.>>2.txt for /f "tokens=1,2* delims=:" %%i in ('findstr /n /o .* 2.txt') do ( set /a n+=1,m=n-1 set "num=%%i"&set "_!n!=%%j"&set "#%%i=%%k" if !m! gtr 0 set /a a=_!n!-_!m!-2 if !max! lss !a! set "max=!a!" ) set /a num-=1 for /l %%i in (1,1,%max%) do set "kong=!kong!#" for /l %%i in (1,1,%num%) do ( set "str=!#%%i!%kong%" set "a=!str:~,%max%!" call,set "a=%%a:!#%%i!=%%" set ".!a!!#%%i!=a" ) for /f "delims==." %%i in ('set .') do ( set "str=%%i" echo !str:#=! ) del /q 2.txt&pause>nul pusofalse: 复制代码 代码如下: @echo off&setlocal enabledelayedexpansion set m=0 for /f "tokens=1,* delims=:" %%a in ('findstr/o .* 1.txt') do ( set/a n+=1,l=n-1,y+=1 set ..!n!=%%a set ##!y!=%%b if !n! geq 2 ( call,set/a s=%%..!n!%%-%%..!l!%%-2,line+=1 call,set "_!s!=%%_!s!%%%%##!line!%% " if !s! geq !m! set m=!s! ) ) for /f "skip=1 delims=:" %%a in ('^(echo !##%y%!^&echo.^)^|findstr/o .*') do set/a final=%%a-3 call,set "_%final%=%%_!final!%% !##%y%!" if %final% geq !m! set m=%final% for /l %%a in (1 1 %m%) do ( if defined _%%a ( for %%i in (!_%%a!) do set -%%i=faith for /f "delims=-=" %%s in ('set -') do ( echo %%s set "-%%s=" ) ) ) pause>nul |
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