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  1. #include <bits/stdc++.h>
  2. #define X first
  3. #define Y second
  4. #define ll long long
  5. #define pii pair<ll, ll>
  6. #define all(x) (x).begin(), (x).end()
  7. #define tp tuple<ll,int,int>
  8. #define oo (ll) 1e18
  9. #define LOG_MAX 20
  10. using namespace std;
  11. #define MAXN 100010
  12. #define MOD 1000000007
  13.  
  14. int n;
  15. int par[MAXN];
  16. vector<pii>points[5];
  17. vector<tp>op;
  18. int Find(int u){
  19.     if(u==par[u]) return u;
  20.     return par[u]=Find(par[u]);
  21. }
  22. bool join(int u,int v){
  23.     u = Find(u) , v = Find(v);
  24.     if(u!=v){
  25.         par[v] = u;
  26.         return true;
  27.     }
  28.     return false;
  29. }
  30. void add(int j,int i){
  31.     int x=abs(points[j][i].X-points[j][i-1].X);
  32.     op.push_back({x,points[j][i].Y,points[j][i-1].Y});
  33. }
  34. signed main(){
  35.     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  36.     //freopen("SHIP.inp","r",stdin);
  37.     //freopen("SHIP.out","w",stdout);
  38.     cin>>n;
  39.     for(int i=1;i<=n;i++){
  40.         int x,y,z; cin>>x>>y>>z;
  41.         points[1].push_back({x,i});
  42.         points[2].push_back({y,i});
  43.         points[3].push_back({z,i});
  44.         par[i]=i;
  45.     }
  46.     ll ans=0;
  47.     sort(all(points[1]));
  48.     sort(all(points[2]));
  49.     sort(all(points[3]));
  50.     for(int i=1;i<n;i++){
  51.         for(int j=1;j<=3;j++)
  52.             add(j,i);
  53.     }
  54.     sort(all(op));
  55.     for(auto [w,u,v] : op){
  56.         if(join(u,v)) ans+=w;
  57.     }
  58.     cout<<ans;
  59.     return 0;
  60. }
  61. /*
  62. */
  63.  
Success #stdin #stdout 0.01s 5312KB
comments (?)
stdin
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5
11 -15 -15
14 -5 -15
-1 -1 -5
10 -4 -1
19 -4 19
stdout
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4
https://ideone.com/jEKQ9o
language:
C++14 (clang 8.0)
created:
20 days ago
visibility:
public

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