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📄 problem - 2156.mht

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Subject: Problem - 2156
Date: Thu, 27 Nov 2008 19:19:35 +0800
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<HTML><HEAD><TITLE>Problem - 2156</TITLE>
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        <TBODY>
        <TR class=3Dbanner align=3Dmiddle bgColor=3D#1a5cc8 height=3D25>
          <TD>Online Judge</TD>
          <TD>Problem Set</TD>
          <TD>Authors</TD>
          <TD>Online Contests</TD>
          <TD>Exercise Author</TD></TR>
        <TR style=3D"FONT-SIZE: 16px" align=3Dmiddle>
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href=3D"http://acm.hdu.edu.cn/listproblem.php?vol=3D1">Problem=20
            Archive</A><BR><A =
href=3D"http://acm.hdu.edu.cn/submit.php">Submit=20
            Solution</A><BR><A =
href=3D"http://acm.hdu.edu.cn/status.php">Realtime=20
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            href=3D"http://acm.hdu.edu.cn/register.php">Register New=20
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name=3Dfield><INPUT=20
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          <TD vAlign=3Dtop width=3D"20%"><A=20
            =
href=3D"http://acm.hdu.edu.cn/contests/contest_show.php?cid=3D158"=20
            ?>Next Contest Time<BR><SPAN=20
            style=3D"FONT-SIZE: 14px; COLOR: red">2008-12-06 12:00:00=20
            (GMT+8)</SPAN></A><BR><A=20
            =
href=3D"http://acm.hdu.edu.cn/contests/contest_list.php?type=3Dscheduled"=
>Scheduled=20
            Contests</A><BR><A=20
            =
href=3D"http://acm.hdu.edu.cn/contests/contest_list.php?type=3Dpassed">Pa=
ssed=20
            Contests</A><BR><A style=3D"COLOR: red"=20
            href=3D"http://acm.hdu.edu.cn/diy/contest_list.php">DIY =
Contests !</A>=20
          </TD>
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            <DIV style=3D"FONT-SIZE: 16px; WIDTH: 150px" align=3Dleft><A =

            =
href=3D"http://acm.hdu.edu.cn/userstatus.php?user=3Djimdavis"><IMG=20
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size=3D+0><B><SPAN=20
      style=3D"FONT-WEIGHT: bold; FONT-SIZE: 12px; COLOR: green; =
FONT-FAMILY: Arial">Time=20
      Limit: 2000/1000 MS (Java/Others)&nbsp;&nbsp;&nbsp;&nbsp;Memory =
Limit:=20
      32768/32768 K (Java/Others)<BR>Total Submission(s):=20
      478&nbsp;&nbsp;&nbsp;&nbsp;Accepted Submission(s):=20
      297<BR></SPAN></B></FONT><BR><BR>
      <DIV class=3Dpanel_title align=3Dleft>Problem Description</DIV>
      <DIV =
class=3Dpanel_content>=CE=D2=C3=C7=B6=A8=D2=E5=C8=E7=CF=C2=BE=D8=D5=F3:<B=
R>1/1 1/2 1/3<BR>1/2 1/1 1/2<BR>1/3=20
      1/2 =
1/1<BR>=BE=D8=D5=F3=B6=D4=BD=C7=CF=DF=C9=CF=B5=C4=D4=AA=CB=D8=CA=BC=D6=D5=
=CA=C71/1=A3=AC=B6=D4=BD=C7=CF=DF=C1=BD=B1=DF=B7=D6=CA=FD=B5=C4=B7=D6=C4=B8=
=D6=F0=B8=F6=B5=DD=D4=F6=A1=A3<BR>=C7=EB=C7=F3=B3=F6=D5=E2=B8=F6=BE=D8=D5=
=F3=B5=C4=D7=DC=BA=CD=A1=A3<BR></DIV>
      <DIV class=3Dpanel_bottom>&nbsp;</DIV><BR>
      <DIV class=3Dpanel_title align=3Dleft>Input</DIV>
      <DIV class=3Dpanel_content>=C3=BF=D0=D0=B8=F8=B6=A8=D5=FB=CA=FDN =
(N&lt;50000)=A3=AC=B1=ED=CA=BE=BE=D8=D5=F3=CE=AA =
N*N.=B5=B1N=CE=AA0=CA=B1=A3=AC=CA=E4=C8=EB=BD=E1=CA=F8=A1=A3</DIV>
      <DIV class=3Dpanel_bottom>&nbsp;</DIV><BR>
      <DIV class=3Dpanel_title align=3Dleft>Output</DIV>
      <DIV =
class=3Dpanel_content>=CA=E4=B3=F6=B4=F0=B0=B8=A3=AC=B1=A3=C1=F42=CE=BB=D0=
=A1=CA=FD=A1=A3</DIV>
      <DIV class=3Dpanel_bottom>&nbsp;</DIV><BR>
      <DIV class=3Dpanel_title align=3Dleft>Sample Input</DIV>
      <DIV class=3Dpanel_content><PRE>1
2
3
4
0</PRE></DIV>
      <DIV class=3Dpanel_bottom>&nbsp;</DIV><BR>
      <DIV class=3Dpanel_title align=3Dleft>Sample Output</DIV>
      <DIV class=3Dpanel_content><PRE>1.00
3.00
5.67
8.83</PRE></DIV>
      <DIV class=3Dpanel_bottom>&nbsp;</DIV><BR>
      <DIV class=3Dpanel_title align=3Dleft>Author</DIV>
      <DIV class=3Dpanel_content>Wiskey</DIV>
      <DIV class=3Dpanel_bottom>&nbsp;</DIV><BR>
      <DIV class=3Dpanel_title align=3Dleft>Source</DIV>
      <DIV =
class=3Dpanel_content>2008=D0=C5=CF=A2=B9=A4=B3=CC=D1=A7=D4=BA=BC=AF=D1=B5=
=B6=D3=A1=AA=A1=AA=D1=A1=B0=CE=C8=FC</DIV>
      <DIV class=3Dpanel_bottom>&nbsp;</DIV><BR>
      <DIV class=3Dpanel_title align=3Dleft>Recommend</DIV>
      <DIV class=3Dpanel_content>linle</DIV>
      <DIV class=3Dpanel_bottom>&nbsp;</DIV><BR>
      <CENTER=20
      style=3D"FONT-WEIGHT: bold; FONT-SIZE: 15px; COLOR: #1a5cc8; =
FONT-FAMILY: Arial"><A=20
      =
href=3D"http://acm.hdu.edu.cn/statistic.php?pid=3D2156">Statistic</A>&nbs=
p;|&nbsp;<A=20
      =
href=3D"http://acm.hdu.edu.cn/submit.php?pid=3D2156">Submit</A>&nbsp;|&nb=
sp;<A=20
      =
href=3D"http://acm.hdu.edu.cn/listproblem.php?vol=3D12">Back</A></CENTER>=
<BR></TD></TR>
  <TR>
    <TD>
      <TABLE=20
      style=3D"BORDER-RIGHT: #1a5cc8 1px solid; BORDER-TOP: #1a5cc8 1px =
solid; FONT-SIZE: 14px; BORDER-LEFT: #1a5cc8 1px solid; BORDER-BOTTOM: =
#1a5cc8 1px solid"=20

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