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0type Ts=set of 2..200; var s1,s2:Ts; i,j:2..200; procedure outset(s:Ts); var i:0..255; begin for i:=0 to 255 do if i in s then write(i:4); w
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0【问题】用1-9这九个数字,不许重复,能排列成多少个四位数? 标准的回溯法解题思路是: procedure tryit(i:integer); var j:integer; begin for j:=1
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1program casio; var a: string; b,c:integer; f,o:longint; g,p:byte; k:longint; s:string; function Lnum (a:string;i:integer):integer; var j:int
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