Submission #864719

#	Time	Username	Problem	Language	Result	Execution time	Memory
864719		mychecksedad	Drawing (CEOI22_drawing)	C++17	100 / 100	200 ms	61328 KiB

Main

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30;

struct P{
  ll x, y;
  void read(){
    cin >> x >> y;
  }
  ll operator * (const P &other) const{
    return x * other.y - y * other.x;
  }
  P operator - (const P &other) const{
    return P{x-other.x, y-other.y};
  }
  bool operator < (const P&other)const{
    return array<ll,2>{y,-x}>array<ll,2>{other.y,-other.x};
  }
};
struct Poly{
  vector<pair<P, int>> poly;
  Poly(int n){
    poly.resize(n);
    for(int i = 0; i < n; ++i)
      poly[i].first.read(), poly[i].second = i;
  }
  void ch(){
    sort(all(poly));
    vector<pair<P, int>> c;

    for(int i = 0; i < poly.size(); ++i){
      while(c.size() > 1 && (poly[i].first - c[c.size() - 2].first) * (c.back().first - c[c.size() - 2].first) < 0) c.pop_back();
      c.pb(poly[i]);
    }    
    c.pop_back();
    reverse(all(poly));
    for(int i = 0; i < poly.size(); ++i){
      while(c.size() > 1 && (poly[i].first - c[c.size() - 2].first) * (c.back().first - c[c.size() - 2].first) < 0) c.pop_back();
      c.pb(poly[i]);
    }     
    c.pop_back();

    poly = c;
  }
};

int n, s[N], pos[N];
vector<int> g[N];
vector<bool> vis, used;
void dfs(int v, int p){
  s[v] = 1;
  for(int u: g[v]){
    if(u != p) dfs(u, v), s[v] += s[u];
  }
}
// int cen(int v, int p){
//   for(int u: g[v]){
//     if(u==p||used[u]) continue
//     if(s[u] > s[v]-s[u]) return cen(u, v);
//   }
//   return v;
// }
// void centroid(int v, vector<pair<P, int>> &v){
//   pre(v, v);
//   int centro = cen(v, v);
//   sort(all(v));
//   pos[v[0].second] = v;
//   sort(v.begin() + 1, v.end(), [&](const pair<P, int> &x, const pair<P, int>  &y){
//     return (x.first - v[0].first) * (y.first - v[0].first) < 0;
//   });


// }
void dfs2(int v, int par, vector<pair<P, int>> &p, int &l){
  pos[p[l].second] = v;
  vis[p[l].second] = 1;
  // cout << v << ' ' << par << '\n';
  // cout << p.poly[l].second << '\n';
  for(int u: g[v]){
    if(u==par) continue;
    // int po = -1;
    // for(int i = 0; i < n; ++i){
    //   if(!vis[p.poly[i].second]){
    //     if(po == -1) po = i;
    //     else{
    //       if((p.poly[po].first - p.poly[l].first) * (p.poly[i].first - p.poly[l].first) > 0){
    //         po = i;
    //       }
    //     }
    //   }
    // }
    ++l;
    dfs2(u, v, p, l);
  }
}
void solve(){
  cin >> n;
  for(int i = 0; i < n-1; ++i){
    int u, v; cin >> u >> v;
    g[u].pb(v);
    g[v].pb(u);
  }
  vector<pair<P, int>> v(n);
  for(int i = 0; i < n; ++i){
    v[i].first.read();
    v[i].second = i;
  }
  vis.resize(n);
  sort(all(v));
  sort(v.begin() + 1, v.end(), [&](const pair<P, int> &x, const pair<P, int>  &y){
    return (x.first - v[0].first) * (y.first - v[0].first) < 0;
  });
  dfs(1, 1);
  int c = 0;
  dfs2(1, 1, v, c);


  for(int i = 0; i < n; ++i) cout << pos[i] << ' ';
}


int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

Compilation message (stderr)

Main.cpp: In member function 'void Poly::ch()':
Main.cpp:38:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<P, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     for(int i = 0; i < poly.size(); ++i){
      |                    ~~^~~~~~~~~~~~~
Main.cpp:44:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<P, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |     for(int i = 0; i < poly.size(); ++i){
      |                    ~~^~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:131:15: warning: unused variable 'aa' [-Wunused-variable]
  131 |   int tt = 1, aa;
      |               ^~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 35 / 35
• Subtask 5: 25 / 25