67 lines
1.5 KiB
C++
67 lines
1.5 KiB
C++
#include<cstdio>
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#include<cstring>
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#include<string>
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#include<algorithm>
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#include<cmath>
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#include<iostream>
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using namespace std;
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double dis[21][21],dp[1<<21];
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int n,fx,fy,mac;
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struct node
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{
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int x,y;
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}nd[21];
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double DIS(double x,double y,double xx,double yy)
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{
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return sqrt((x-xx)*(x-xx)+(y-yy)*(y-yy));
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}
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bool cmp(node a,node b)
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{
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return DIS(a.x,a.y,fx,fy)<DIS(b.x,b.y,fx,fy);
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}
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double DP(int sta)
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{
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if(dp[sta]!=0x7fffffff)
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return dp[sta];
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if(sta==0) {dp[0]=0.0;}
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else
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{
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int tem=sta,i=0;
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for(i=0;i<20;i++)
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{
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if((1<<i)&sta)break;
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}
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for(int j=i+1;j<2*n;j++)
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{
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if((sta&(1<<j))==0)continue;
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dp[sta]=min(DP(sta-(1<<j)-(1<<i))+dis[i][j],dp[sta]);
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}
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}
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return dp[sta];
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}
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int main()
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{
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int c,ca=0;
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scanf("%d",&c);
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while(c--)
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{
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ca++;
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scanf("%d%d",&fx,&fy);
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scanf("%d",&n);
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for(int i=0;i<2*n;i++)
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{
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scanf("%d%d",&nd[i].x,&nd[i].y);
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}
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sort(nd,nd+2*n,cmp);
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for(int i=0;i<2*n;i++)
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for(int j=i+1;j<2*n;j++)
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{
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dis[i][j]=DIS(nd[i].x,nd[i].y,fx,fy)+DIS(nd[i].x*1.0,nd[i].y*1.0,nd[j].x*1.0,nd[j].y*1.0);
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}
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printf("Case #%d: ",ca);
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for(int i=0;i<(1<<2*n);i++)
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dp[i]=0x7fffffff;
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printf("%.2f\n",DP((1<<(2*n))-1));
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}
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}
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