No submission language available for this problem.

题目描述

<style> v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} </style>

<![endif]--><!--[if gte mso 9]><xml>

<w:WordDocument>

<w:View>Normal</w:View>

<w:Zoom>0</w:Zoom>

<w:PunctuationKerning />

<w:DrawingGridVerticalSpacing>7.8 磅</w:DrawingGridVerticalSpacing>

<w:DisplayHorizontalDrawingGridEvery>0</w:DisplayHorizontalDrawingGridEvery>

<w:DisplayVerticalDrawingGridEvery>2</w:DisplayVerticalDrawingGridEvery>

<w:ValidateAgainstSchemas />

<w:SaveIfXMLInvalid>false</w:SaveIfXMLInvalid>

<w:IgnoreMixedContent>false</w:IgnoreMixedContent>

<w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText>

<w:Compatibility>

<w:SpaceForUL />

<w:BalanceSingleByteDoubleByteWidth />

<w:DoNotLeaveBackslashAlone />

<w:ULTrailSpace />

<w:DoNotExpandShiftReturn />

<w:AdjustLineHeightInTable />

<w:BreakWrappedTables />

<w:SnapToGridInCell />

<w:WrapTextWithPunct />

<w:UseAsianBreakRules />

<w:DontGrowAutofit />

<w:UseFELayout />

</w:Compatibility>

<w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel>

</w:WordDocument>

</xml><![endif]--><!--[if gte mso 9]><xml>

<w:LatentStyles DefLockedState="false" LatentStyleCount="156">

</w:LatentStyles>

</xml><![endif]--><!--[if !mso]><object

classid="clsid:38481807-CA0E-42D2-BF39-B33AF135CC4D" id=ieooui></object>

<style> st1\:*{behavior:url(#ieooui) } </style>

<![endif]--><!--[if gte mso 10]>

<style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:普通表格; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} </style>

<![endif]-->

上图中，A,B,C,D,E点为A国城市，且目前都要保护，那么修建的防线就会是A-B-C-D，花费也就是线段AB的长度+线段BC的长度+线段CD的长度,如果，这个时候撤销B点的保护，那么防线变成下图

输入格式

输出格式

对于每个询问输出1行，一个实数v，表示修建防线的花费，保留两位小数

4 2 1  2  1 2  3 2  5  2 1 1 2 1 2 2

6.47 5.84 4.47

数据范围与约定