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Submission #466356

# Submission time Handle Problem Language Result Execution time Memory
466356 2021-08-18T22:29:29 Z ivan_tudor Roads (CEOI20_roads) C++14
0 / 100
 62 ms 3608 KB 
#include<bits/stdc++.h>
using namespace std;
const int N = 1e5+ 5;
struct points{
  int x, y;
  int type;
  int id;
  bool operator <(points oth) const{
    if(y == oth.y)
      return id < oth.id;
    return y < oth.y;
  }
};
set<points> act;
pair<int, int> upper[N], lower[N];
bool cmp(points a, points b){
  if(a.x == b.x)
    return a.type < b.type;
  return a.x < b.x;
}
int v[N][4];
pair<int, int> general = {INT_MIN, INT_MIN};
int main()
{
  //freopen(".in","r",stdin);
  ios::sync_with_stdio(false);
  cin.tie(0),cout.tie(0);
  int n;
  cin>>n;
  vector<points> ev;
  for(int i =1 ; i <=n; i++){
    int x1, y1, x2, y2;
    cin>>x1>>y1>>x2>>y2;
    if(x1 >x2){
      swap(x1, x2);
      swap(y1, y2);
    }
    v[i][0] = x1;
    v[i][1] = y1;
    v[i][2] = x2;
    v[i][3] = y2;
    if(x1 == x2){
      ev.push_back({x1, y1, 2, i});
      ev.push_back({x1, y1, -1, i});
    }
    else{
      ev.push_back({x1, y1, 1, i});
      ev.push_back({x2, y2, 0, i});
    }
  }
  sort(ev.begin(), ev.end(), cmp);
  for(auto e : ev){
    if(e.type == 1){
      pair<int, int> last = {INT_MIN, INT_MIN};
      auto nxt = act.upper_bound({e});
      if(nxt != act.end()){
          last = upper[(*nxt).id];
          upper[(*nxt).id] = {e.x, e.y};
      }
      if(nxt != act.begin()){
        nxt = prev(nxt);
        if(lower[(*nxt).id].first > last.first)
          last =  lower[(*nxt).id];
        lower[(*nxt).id] = {e.x, e.y};
      }
      if(last.first == INT_MIN)
        last = general;
      if(last.first != INT_MIN){
        cout<<last.first<<" "<<last.second<<" "<<e.x<<" "<<e.y<<"\n";
      }
      act.insert({e.x, e.y, 0, e.id});
      upper[e.id] = {e.x, e.y};
      lower[e.id] = {e.x, e.y};
    }
    else if(e.type == 0){
      auto itr = act.find({v[e.id][0], v[e.id][1], 0, e.id});
      assert(itr != act.end());
      auto nxt = next(itr);
      if(nxt != act.end()){
        upper[(*nxt).id] = {e.x, e.y};
      }
      if(itr != act.begin()){
        nxt = prev(itr);
        lower[(*nxt).id] = {e.x, e.y};
      }
      act.erase({v[e.id][0], v[e.id][1], 0, e.id});
    }
    else if(e.type == -1){

      int ys = v[e.id][1], yf = v[e.id][3];
      if(ys > yf)
        swap(ys, yf);
      pair<int, int> last = {INT_MIN, INT_MIN};
      int tp = 0;
      auto nxt = act.upper_bound({0, yf, 0, e.id});
      if(nxt != act.end()){
        last = upper[(*nxt).id];
        tp = 1;
        upper[(*nxt).id] = {e.x, yf};
      }
      if(nxt != act.begin()){
        nxt = prev(nxt);
        if(lower[(*nxt).id].first > last.first)
          last = lower[(*nxt).id], tp = 2;
        lower[(*nxt).id] = {e.x, ys};
      }
      if(tp == 1){
        cout<<last.first<<" "<<last.second<<" "<<e.x<<" "<<yf<<"\n";
      }
      else if(tp == 2){
        cout<<last.first<<" "<<last.second<<" "<<e.x<<" "<<ys<<"\n";
      }
      else if(general.first != INT_MIN)
        cout<<general.first<<" "<<general.second<<" "<<e.x<<" "<<ys<<"\n";
      act.insert({e.x, v[e.id][1], 0, e.id});
    }
    else if(e.type == 2){
      act.erase({e.x, v[e.id][1], 0, e.id});
    }
    general = {e.x, e.y};
  }
  return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Failed 50 ms 3608 KB Condition failed: "pf == Sline.end() || !Cross(S[*pi], S[*pf])"

Subtask #2
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Failed 2 ms 460 KB Condition failed: "iA != P2I.end()"
4 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Failed 2 ms 460 KB Condition failed: "iA != P2I.end()"
4 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Failed 2 ms 460 KB Condition failed: "iA != P2I.end()"
4 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Failed 2 ms 460 KB Condition failed: "iA != P2I.end()"
5 Halted 0 ms 0 KB -

Subtask #6
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Failed 62 ms 3556 KB Condition failed: "pf == Sline.end() || !Cross(S[*pi], S[*pf])"
3 Halted 0 ms 0 KB -