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| #include <stdio.h>
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| #include <math.h>
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| #include <stdlib.h>
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| #include <string.h>
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| #include <stack>
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| #include <queue>
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| #include <vector>
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| #include <utility>
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| #include <string>
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| #include <sstream>
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| #include <iostream>
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| #include <set>
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| #include <map>
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| #include <algorithm>
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| #include <memory.h>
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| #include <functional>
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| #include <numeric>
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| #include <bits/stdc++.h>
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| using namespace std;
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|
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| #define pi 2*acos(0.0)
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| #define all(v) v.begin(),v.end()
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|
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| #define si(t) scanf("%d",&t)
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| #define sl(t) scanf("%lld",&t)
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| #define sf(t) scanf("%f",&t)
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| #define sd(t) scanf("%lf",&t)
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| #define sc(c) scanf("%c",&c)
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| #define sii(a,b) scanf("%d%d",&a,&b)
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| #define sll(a,b) scanf("%lld%lld",&a,&b)
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| #define P(a) printf("%d\n",a)
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| #define PL(a) printf("%lld\n",a)
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| #define PF(a) printf("%f\n",a)
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| #define PD(a) printf("%lf\n",a)
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| #define PS(a) printf("%s\n",a)
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| #define PSN(a) printf("%s ",a)
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| #define PN(a) printf("%d ",a)
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| #define PLN(a) printf("%lld ",a)
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| #define PFN(a) printf("%f ",a)
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| #define PDN(a) printf("%lf ",a)
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| #define PP(a,b) printf("%d %d\n",a,b)
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| #define PPN(a,b) printf("%d %d ",a,b)
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| #define PPL(a,b) printf("%lld %lld\n",a,b)
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| #define PPLN(a,b) printf("%lld %lld ",a,b)
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|
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| #define CP(a) cout<<a<<endl
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| #define CPN(a) cout<<a<<" "
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|
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| #define ff first
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| #define se second
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| #define pb push_back
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| #define ST(v) sort(all(v))
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| #define sz(x) (int)x.size()
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| #define gcd(a,b) __gcd(a,b)
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| #define lcm(a,b) (a*(b/gcd(a,b)))
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| #define max3(a,b,c) max(a,max(b,c))
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| #define min3(a,b,c) min(a,min(b,c))
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| #define maxall(v) *max_element(all(v))
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| #define minall(v) *min_element(all(v))
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| #define sqr(a) ((a)*(a))
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| #define abs(x) (((x)<0)?-(x):(x))
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| #define cover(a,d) memset(a,d,sizeof(a))
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| #define popcount(i) __builtin_popcount(i)
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| #define parity(i) __builtin_parity(i)
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| #define btz(a) __builtin_ctz(a)
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| #define un(v) ST(v), (v).erase(unique(all(v)),v.end())
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| #define common(a,b) ST(a), ST(b), a.erase(set_intersection(all(a),all(b),a.begin()),a.end())
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| #define uncommon(a,b) ST(a), ST(b), a.erase(set_symmetric_difference(all(a),all(b),a.begin()),a.end())
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|
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| typedef long long ll;
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| typedef unsigned long long ull;
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|
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| typedef vector<int> vi;
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| typedef vector<ll> vll;
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| typedef vector<string> vs;
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| typedef set<int> si;
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| typedef set<string> ss;
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| typedef map<int,int> mii;
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| typedef map<ll,ll> mll;
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| typedef map<string,int> msi;
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| typedef map<char,int> mci;
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|
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| template <typename T>string toString( T Number ){stringstream st;st << Number;return st.str();}
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| template <typename T> T SOD(T n) {__typeof(n) sum=0;for(__typeof(n) i=1;i*i<=n;i++)sum+=(n%i)?0:((i*i==n)?i:i+n/i);return sum;}
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| #define forab(i,a,b) for(__typeof(b) i=(a);i<=(b);i++)
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| #define for0(i,n) forab(i,0,(n)-1)
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| #define for1(i,n) forab(i,1,n)
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| #define rforab(i,b,a) for(__typeof(b) i=(b);i>=(a);i--)
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| #define rfor0(i,n) rforab(i,(n)-1,0)
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| #define rfor1(i,n) rforab(i,n,1)
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| #define forstl(i,s) for(__typeof((s).end()) i=(s).begin(); i != (s).end(); i++)
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| #define input freopen("in.txt","r",stdin)
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| #define output freopen("out.txt","w",stdout)
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| #define LB(a,value) (lower_bound(all(a),value)-a.begin())
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| #define UB(a,value) (upper_bound(all(a),value)-a.begin())
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| #define Case(no) printf("Case %d: ",++no)
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| #define nl puts("")
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|
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| int stringconvert(string s){int p; istringstream st(s); st>>p ; return p;}
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|
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| ll pow(ll a,ll b, ll m) { ll res = 1; while(b) { if(b & 1) { res = ( (res % m) * (a % m) ) %m ; } a= ((a%m) * (a%m)) %m; b >>= 1; } return res; }
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| ll modInverse(ll a, ll m){return pow(a,m-2,m);}
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| #define mx7 10000007
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| #define mx6 1000006
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| #define mx5 100005
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| #define inf 1<<30
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| #define eps 1e-9
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| #define mx (100010)
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| #define mod 1000000007
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|
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| int par[1000005];
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|
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| struct point {
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| double x,y;
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| };
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|
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| struct f{
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|
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| int a,b;
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| double d;
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|
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| f(int x,int y,double z)
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| {
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| a=x,b=y,d=z;
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| }
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| };
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|
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| int Find(int n)
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| {
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| if(par[n]==n)
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| return n;
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| return par[n]=Find(par[n]);
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| }
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|
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| void Union(int a,int b)
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| {
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| int u= Find(a);
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| int v= Find(b);
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| if(u!=v)
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| {
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| par[u]=v;
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| }
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| }
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|
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| double dis(point a,point b)
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| {
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| return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));
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| }
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|
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| bool cmp(f a,f b)
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| {
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| return a.d<b.d;
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| }
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|
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| int main()
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| {
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| int t;
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| si(t);
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| while(t--)
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| {
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| int n;
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| si(n);
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|
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| for0(i,100)
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| par[i]=i;
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|
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| point a[110];
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| for0(i,n)
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| {
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| sd(a[i].x),sd(a[i].y);
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| }
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|
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| vector<f> v;
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|
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| for0(i,n)
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| {
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| for0(j,n)
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| {
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| if(i==j) continue;
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|
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| double p = dis(a[i],a[j]);
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| v.pb(f(i,j,p));
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| }
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| }
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|
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| sort(v.begin(),v.end(),cmp);
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| int len = v.size();
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|
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| double res = 0.0;
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| for0(i,len)
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| {
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| int x= Find(v[i].a);
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| int y= Find(v[i].b);
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| if(x!=y)
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| {
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| Union(x,y);
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| res+=v[i].d;
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| }
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| }
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|
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| printf("%.2lf\n",res);
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|
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| if(t)
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| nl;
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|
|
| }
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|
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| return 0;
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| }
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