[求助]达人请进，关于flag

jiju8484

<>M文件中FLAG有什么作用啊 ？那位达人解释下啊！</P>
<>2  旅行商（TSP）问题</P>
< >一名推销员准备前往若干城市推销产品，然后回到他的出发地。如何为他设计一条最短的旅行路线（从驻地出发，经过每个城市恰好一次，最后返回驻地）？这个问题称为旅行商问题。用图论的术语说，就是在一个赋权完全图中，找出一个有最小权的Hamilton圈。称这种圈为最优圈。与最短路问题及连线问题相反，目前还没有求解旅行商问题的有效算法。所以希望有一个方法以获得相当好（但不一定最优）的解。</P>
<P >一个可行的办法是首先求一个Hamilton圈<V:SHAPETYPE> <V:STROKE joinstyle="miter"><V:FORMULAS><V:F eqn="if lineDrawn pixelLineWidth 0"><V:F eqn="sum @0 1 0"><V:F eqn="sum 0 0 @1"><V:F eqn="prod @2 1 2"><V:F eqn="prod @3 21600 pixelWidth"><V:F eqn="prod @3 21600 pixelHeight"><V:F eqn="sum @0 0 1"><V:F eqn="prod @6 1 2"><V:F eqn="prod @7 21600 pixelWidth"><V:F eqn="sum @8 21600 0"><V:F eqn="prod @7 21600 pixelHeight"><V:F eqn="sum @10 21600 0"></V:FORMULAS><VATH extrusionok="f" gradientshapeok="t" connecttype="rect"><LOCK v:ext="edit" aspectratio="t"></V:SHAPETYPE><V:SHAPE><V:IMAGEDATA></V:SHAPE><IMG src="http://www.math.sdu.edu.cn/html/sxjm/texts/chapter5/5_6_3.6.gif"> ，然后适当修改<V:SHAPE> <V:IMAGEDATA></V:SHAPE><IMG src="http://www.math.sdu.edu.cn/html/sxjm/texts/chapter5/5_6_3.7.gif"> 以得到具有较小权的另一个Hamilton圈。</V:IMAGEDATA></V:IMAGEDATA></LOCK></VATH></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:STROKE></P>
<P ><V:STROKE joinstyle="miter"><V:F eqn="if lineDrawn pixelLineWidth 0"><V:F eqn="sum @0 1 0"><V:F eqn="sum 0 0 @1"><V:F eqn="prod @2 1 2"><V:F eqn="prod @3 21600 pixelWidth"><V:F eqn="prod @3 21600 pixelHeight"><V:F eqn="sum @0 0 1"><V:F eqn="prod @6 1 2"><V:F eqn="prod @7 21600 pixelWidth"><V:F eqn="sum @8 21600 0"><V:F eqn="prod @7 21600 pixelHeight"><V:F eqn="sum @10 21600 0"><VATH extrusionok="f" gradientshapeok="t" connecttype="rect"><LOCK v:ext="edit" aspectratio="t"><V:IMAGEDATA><V:IMAGEDATA></V:IMAGEDATA></V:IMAGEDATA></LOCK></V:PATH></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:F></V:STROKE>原程序如下：也可以见网址（<a href="http://www.math.sdu.edu.cn/html/sxjm/texts/chapter5/5_6_3.htm" target="_blank" >http://www.math.sdu.edu.cn/html/sxjm/texts/chapter5/5_6_3.htm</A>）</P>[em06][em06][em06][em06][em06]

jiju8484

< align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">clc,clear
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< align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">a(1,2)=56;a(1,3)=35;a(1,4)=21;a(1,5)=51;a(1,6)=60;
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< align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">a(2,3)=21;a(2,4)=57;a(2,5)=78;a(2,6)=70;
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">a(3,4)=36;a(3,5)=68;a(3,6)=68;
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">a(4,5)=51;a(4,6)=61;
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">a(5,6)=13;
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">a(6,=0;
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">a=a+a';
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jiju8484

< align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">c1=[5 1:4 6]; <BR>
<>
< align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">L=length(c1);
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none"><STRONG>flag=1;
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none"><STRONG>while flag&gt;0
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none"><STRONG>flag=0;
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">for m=1-3
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">for n=m+2-1
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">if a(c1(m),c1(n))+a(c1(m+1),c1(n+1))&lt;a(c1(m),c1(m+1))+a(c1(n),c1(n+1))
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none"><STRONG>flag=1;
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">c1(m+1:n)=c1(n:-1:m+1);
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">end
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">end
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">end
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">end
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">sum1=0;
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">for i=1-1
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">sum1=sum1+a(c1(i),c1(i+1));
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">end
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">circle=c1;
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">sum=sum1;
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">circle,sum
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<P align=left class=MsoNormal style="TEXT-ALIGN: left; tab-stops: 18.0pt 36.0pt 54.0pt 72.0pt 90.0pt 108.0pt 126.0pt 144.0pt 162.0pt 180.0pt 198.0pt 216.0pt 234.0pt 252.0pt 270.0pt 288.0pt 306.0pt 324.0pt 342.0pt 360.0pt 378.0pt 396.0pt 414.0pt 432.0pt 450.0pt 468.0pt 486.0pt 504.0pt 522.0pt 540.0pt 558.0pt 576.0pt; mso-layout-grid-align: none">
<P>大人指点啊！！！不明白FLAG的意思啊 </P>