72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
#include<stdio.h>
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#include<math.h>
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#include<algorithm>
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using namespace std;
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int x[10005],y[10005],fa[1000005];
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double fun(int x1,int y1,int x2,int y2)
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{
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return sqrt(pow(x1-x2,2.0)+pow(y1-y2,2.0));
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}
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int find(int x)
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{
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int k,j,r;
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r=x;
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while(r!=fa[r])
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r=fa[r];
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k=x;
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while(k!=r)
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{
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j=fa[k];
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fa[k]=r;
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k=j;
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}
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return r;
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}
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int main()
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{
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int t,n,i,j,k;
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double len;
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scanf("%d",&t);
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while(t--)
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{
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pair<int,int> pa;
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pair< double,pair<int,int> > p[10005];
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k=0;
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scanf("%d",&n);
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for(i=0;i<n;i++)
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scanf("%d %d",&x[i],&y[i]);
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for(i=0;i<n;i++)
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for(j=0;j<n;j++)
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{
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if(i==j) continue;
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len=fun(x[i],y[i],x[j],y[j]);
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if(len>=10&&len<=1000)
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{
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pa=make_pair(i,j);
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p[k++]=make_pair(len,pa);
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}
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}
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sort(p,p+k);
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for(i=0;i<=n;i++)
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fa[i]=i;
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int a,b,ans=0;
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double cnt=0;
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for(i=0;i<k;i++)
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{
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a=find(p[i].second.first);
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b=find(p[i].second.second);
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if(a!=b)
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{
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fa[a]=b;
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cnt+=p[i].first;
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ans++;
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}
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}
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if(ans==n-1)
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printf("%.1lf\n",cnt*100);
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else
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printf("oh!\n");
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}
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return 0;
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}
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