oj.uz

Submission #1108115

# Submission time Handle Problem Language Result Execution time Memory
1108115 2024-11-02T20:24:23 Z Lincito_31 Parachute rings (IOI12_rings) C++17
55 / 100
 4000 ms 74464 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int N,inde_t4=0,inde_t3=0;
vector<vector<int>> gra;
set<int> ciclos;
set<int> t3,t4;
ll res=-1;
vector<int> dsu;
vector<bool> visited;
bool cambio=false,xd=false;
int find(int a){
  if(dsu[a]==a){
    return a;
  }
  return dsu[a]=find(dsu[a]);
}
bool unir(int a, int b){
  a=find(a);b=find(b);
  if(a==b){
    return false;
  }
  if(ciclos.find(a)==ciclos.end()){
    dsu[a]=b;
  }else{
    dsu[b]=a;
  }
  return true;
}

void Init(int N_) {
  N=N_;
  dsu.resize(N);
  for(int i=0;i<N;i++){
    dsu[i]=i;
  }
  gra.resize(N);
  res=N;
}
void Link(int A, int B) {
  if(!unir(A,B)){
    ciclos.insert(find(A));
    cambio=true;
  }
  gra[A].push_back(B);
  if(gra[A].size()>=3){
    t3.insert(A);
    inde_t3=A;
    cambio=true;
  }
  if(gra[A].size()>=4){
    inde_t4=A;
    t4.insert(A);
    cambio=true;
  }
  gra[B].push_back(A);
  if(gra[B].size()>=3){
    t3.insert(B);
    inde_t3=B;
    cambio=true;
  }
  if(gra[B].size()>=4){
    inde_t4=B;
    t4.insert(B);
    cambio=true;
  }
}
void dfs(int now,int nooo,int ante){
  int conta=0;
  if(xd){
    return;
  }
  if(visited[now]){
    xd=true;
    return;
  }
  visited[now]=true;
  for(auto u:gra[now]){
    if(u==nooo || u==ante){
      continue;
    }
    dfs(u,nooo,now);
    conta++;
    if(conta>1){
      xd=true;
    }
    if(xd){
      return;
    }
  }
}
int CountCritical(){
  if(!cambio || res==0){
    // no paso nada
  }else if(t4.size()>=2){
    res=0;
  }/*else if(t3.size()>=5){
    res=0;
  }*/else if(ciclos.size()>=2){
    res=0;
  }else if(t4.size()==1){
    // si quito inde_t4 es un chain?
    xd=false;
    res=1;
    visited.assign(N,false);
    for(int i=0;i<N;i++){
      if(visited[i] || i==inde_t4){
        continue;
      }
      if(gra[i].size()==1){
        dfs(i,inde_t4,-1);
      }else if(gra[i].size()==2){
        if(gra[i][0]==inde_t4 || gra[i][1]==inde_t4){
          dfs(i,inde_t4,-1);
        }
      }
      if(xd){
        res=0;
        break;
      }
    }
    if(!xd){
      for(int i=0;i<N;i++){
        if(visited[i] || i==inde_t4 || dsu[i]==i){
          continue;
        }else{
          xd=true;
          res--;
          break;
        }
      }
    }
  }else if(t3.size()>=1){
    // si quito el inde_3 o sus vecinos sera un chain?
    xd=false;
    visited.assign(N,false);
    res=4;
    for(int i=0;i<N;i++){
      if(visited[i] || i==inde_t3){
        continue;
      }
      if(gra[i].size()==1){
        dfs(i,inde_t3,-1);
      }else if(gra[i].size()==2){
        if(gra[i][0]==inde_t3 || gra[i][1]==inde_t3){
          dfs(i,inde_t3,-1);
        }
      }
      if(xd){
        res--;
        break;
      }
    }
    if(!xd){
      for(int i=0;i<N;i++){
        if(visited[i] || i==inde_t3 || dsu[i]==i){
          continue;
        }else{
          xd=true;
          res--;
          break;
        }
      }
    }
    for(auto uu:gra[inde_t3]){
      xd=false;
      visited.assign(N,false);
      for(int i=0;i<N;i++){
        if(visited[i] || i==uu){
          continue;
        }
        if(gra[i].size()==1){
          dfs(i,uu,-1);
        }else if(gra[i].size()==2){
          if(gra[i][0]==uu || gra[i][1]==uu){
            dfs(i,uu,-1);
          }
        }
        if(xd){
          res--;
          break;
        }
      }
      if(!xd){
        for(int i=0;i<N;i++){
          if(visited[i] || i==uu || dsu[i]==i){
            continue;
          }else{
            xd=true;
            res--;
            break;
          }
        }
      }
    }
  }else if(ciclos.size()==1){
    //cuantos elementos pertenecen a este ciclo?
    int com=*ciclos.begin(),cont=0;
    for(int i=0;i<N;i++){
      if(find(i)==com){
        cont++;
      }
    }
    res=cont;
  }
  cambio=false;
  return res;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 2 ms 716 KB Output is correct
3 Correct 2 ms 592 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 628 KB Output is correct
6 Correct 2 ms 592 KB Output is correct
7 Correct 1 ms 592 KB Output is correct
8 Correct 1 ms 592 KB Output is correct
9 Correct 3 ms 860 KB Output is correct
10 Correct 3 ms 592 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 241 ms 30924 KB Output is correct
2 Correct 642 ms 47688 KB Output is correct
3 Correct 1152 ms 74464 KB Output is correct
4 Correct 549 ms 59080 KB Output is correct
5 Correct 546 ms 58952 KB Output is correct
6 Correct 523 ms 57876 KB Output is correct
7 Correct 892 ms 72140 KB Output is correct
8 Correct 997 ms 55724 KB Output is correct
9 Correct 699 ms 59976 KB Output is correct
10 Correct 352 ms 57672 KB Output is correct

Subtask #3
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 2 ms 716 KB Output is correct
3 Correct 2 ms 592 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 628 KB Output is correct
6 Correct 2 ms 592 KB Output is correct
7 Correct 1 ms 592 KB Output is correct
8 Correct 1 ms 592 KB Output is correct
9 Correct 3 ms 860 KB Output is correct
10 Correct 3 ms 592 KB Output is correct
11 Correct 3 ms 592 KB Output is correct
12 Correct 5 ms 1104 KB Output is correct
13 Correct 6 ms 1104 KB Output is correct
14 Correct 12 ms 848 KB Output is correct
15 Correct 15 ms 1184 KB Output is correct
16 Correct 3 ms 848 KB Output is correct
17 Correct 3 ms 848 KB Output is correct
18 Correct 5 ms 1360 KB Output is correct
19 Correct 5 ms 848 KB Output is correct
20 Correct 5 ms 848 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 2 ms 716 KB Output is correct
3 Correct 2 ms 592 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 628 KB Output is correct
6 Correct 2 ms 592 KB Output is correct
7 Correct 1 ms 592 KB Output is correct
8 Correct 1 ms 592 KB Output is correct
9 Correct 3 ms 860 KB Output is correct
10 Correct 3 ms 592 KB Output is correct
11 Correct 3 ms 592 KB Output is correct
12 Correct 5 ms 1104 KB Output is correct
13 Correct 6 ms 1104 KB Output is correct
14 Correct 12 ms 848 KB Output is correct
15 Correct 15 ms 1184 KB Output is correct
16 Correct 3 ms 848 KB Output is correct
17 Correct 3 ms 848 KB Output is correct
18 Correct 5 ms 1360 KB Output is correct
19 Correct 5 ms 848 KB Output is correct
20 Correct 5 ms 848 KB Output is correct
21 Correct 17 ms 2640 KB Output is correct
22 Correct 16 ms 4176 KB Output is correct
23 Correct 21 ms 5200 KB Output is correct
24 Execution timed out 4085 ms 4256 KB Time limit exceeded
25 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 2 ms 716 KB Output is correct
3 Correct 2 ms 592 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 628 KB Output is correct
6 Correct 2 ms 592 KB Output is correct
7 Correct 1 ms 592 KB Output is correct
8 Correct 1 ms 592 KB Output is correct
9 Correct 3 ms 860 KB Output is correct
10 Correct 3 ms 592 KB Output is correct
11 Correct 241 ms 30924 KB Output is correct
12 Correct 642 ms 47688 KB Output is correct
13 Correct 1152 ms 74464 KB Output is correct
14 Correct 549 ms 59080 KB Output is correct
15 Correct 546 ms 58952 KB Output is correct
16 Correct 523 ms 57876 KB Output is correct
17 Correct 892 ms 72140 KB Output is correct
18 Correct 997 ms 55724 KB Output is correct
19 Correct 699 ms 59976 KB Output is correct
20 Correct 352 ms 57672 KB Output is correct
21 Correct 3 ms 592 KB Output is correct
22 Correct 5 ms 1104 KB Output is correct
23 Correct 6 ms 1104 KB Output is correct
24 Correct 12 ms 848 KB Output is correct
25 Correct 15 ms 1184 KB Output is correct
26 Correct 3 ms 848 KB Output is correct
27 Correct 3 ms 848 KB Output is correct
28 Correct 5 ms 1360 KB Output is correct
29 Correct 5 ms 848 KB Output is correct
30 Correct 5 ms 848 KB Output is correct
31 Correct 17 ms 2640 KB Output is correct
32 Correct 16 ms 4176 KB Output is correct
33 Correct 21 ms 5200 KB Output is correct
34 Execution timed out 4085 ms 4256 KB Time limit exceeded
35 Halted 0 ms 0 KB -