oj.uz

Submission #880182

# Submission time Handle Problem Language Result Execution time Memory
880182 2023-11-29T02:00:41 Z abcvuitunggio Parachute rings (IOI12_rings) C++17
37 / 100
 1335 ms 118404 KB 
#include <iostream>
#include <vector>
using namespace std;
int n,focused=-1,ch[5],cnt,mx,deg[1000001],deg2[1000001],p[1000001][5],cycle,cyclesize,sz[1000001][5];
vector <int> candidates,ke[1000001];
vector <pair <int, int>> edge;
void reset(int j){
    for (int i=0;i<n;i++){
        p[i][j]=i;
        sz[i][j]=1;
    }
    ch[j]=1;
}
int f(int i, int j){
    return (p[i][j]==i?i:p[i][j]=f(p[i][j],j));
}
bool unite(int u, int v, int idx){
    u=f(u,idx);
    v=f(v,idx);
    if (u==v)
        return 0;
    if (sz[u][idx]<sz[v][idx])
        swap(u,v);
    sz[u][idx]+=sz[v][idx];
    p[v][idx]=u;
    return 1;
}
void focus(int node, int j=0){
    reset(j);
    for (auto [u,v]:edge)
        if (u!=node&&v!=node)
            ch[j]&=unite(u,v,j);
}
void Init(int N){
    n=N;
    for (int i=0;i<5;i++)
        reset(i);
}
void Link(int a, int b){
    edge.push_back({a,b});
    if (focused!=-1){
        if (a!=focused&&b!=focused)
            ch[0]&=unite(a,b,0);
        return;
    }
    deg[a]++;
    deg[b]++;
    ke[a].push_back(b);
    ke[b].push_back(a);
    if (deg[a]==4){
        focus(a);
        focused=a;
        return;
    }
    if (deg[b]==4){
        focus(b);
        focused=b;
        return;
    }
    int cnt2=cnt;
    if (deg[a]==3){
        cnt2++;
        for (int v:ke[a])
            if (deg[v]>2&&v!=b){
                deg2[a]++;
                deg2[v]++;
            }
    }
    if (deg[b]==3){
        cnt2++;
        for (int v:ke[b])
            if (deg[v]>2){
                deg2[b]++;
                deg2[v]++;
            }
    }
    if (cnt2>4){
        cnt=cnt2;
        return;
    }
    if (!cnt2){
        if (deg[a]==2&&deg[b]==2&&f(a,0)==f(b,0)){
            cycle++;
            cyclesize=sz[f(a,0)][0];
        }
        unite(a,b,0);
    }
    else if (cnt2==1){
        if (!cnt){
            if (deg[a]<deg[b])
                swap(a,b);
            candidates.push_back(a);
            for (int v:ke[a])
                candidates.push_back(v);
            for (int i=0;i<candidates.size();i++)
                focus(candidates[i],i);
        }
        else{
            for (int i=0;i<candidates.size();i++)
                if (a!=candidates[i]&&b!=candidates[i])
                    ch[i]&=unite(a,b,i);
        }
    }
    else if (cnt2==2){
        if (cnt<2){
            candidates.clear();
            int u=-1,v=-1;
            for (int i=0;i<n;i++)
                if (deg[i]>2)
                    (u==-1?u=i:v=i);
            for (int i=0;i<n;i++){
                int cnt3=(i==u||i==v);
                for (int j:ke[i])
                    cnt3+=(j==u||j==v);
                if (cnt3==2)
                    candidates.push_back(i);
            }
            for (int i=0;i<candidates.size();i++)
                focus(candidates[i],i);
        }
        else{
            for (int i=0;i<candidates.size();i++)
                if (a!=candidates[i]&&b!=candidates[i])
                    ch[i]&=unite(a,b,i);
        }
    }
    else if (cnt<cnt2){
        candidates.clear();
        for (int i=0;i<n;i++)
            if (deg[i]>2&&deg2[i]==cnt2-1)
                candidates.push_back(i);
        for (int i=0;i<candidates.size();i++)
                focus(candidates[i],i);
    }
    else{
        for (int i=0;i<candidates.size();i++)
            if (a!=candidates[i]&&b!=candidates[i])
                ch[i]&=unite(a,b,i);
    }
    cnt=cnt2;
}
int CountCritical(){
    if (focused!=-1)
        return ch[0];
    if (cnt>4)
        return 0;
    if (cnt){
        int res=0;
        for (int i=0;i<candidates.size();i++)
            res+=ch[i];
        return res;
    }
    return (cycle>1?0:(cycle==1?cyclesize:n));
}

Compilation message

rings.cpp: In function 'void Link(int, int)':
rings.cpp:95:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |             for (int i=0;i<candidates.size();i++)
      |                          ~^~~~~~~~~~~~~~~~~~
rings.cpp:99:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |             for (int i=0;i<candidates.size();i++)
      |                          ~^~~~~~~~~~~~~~~~~~
rings.cpp:118:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  118 |             for (int i=0;i<candidates.size();i++)
      |                          ~^~~~~~~~~~~~~~~~~~
rings.cpp:122:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  122 |             for (int i=0;i<candidates.size();i++)
      |                          ~^~~~~~~~~~~~~~~~~~
rings.cpp:132:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  132 |         for (int i=0;i<candidates.size();i++)
      |                      ~^~~~~~~~~~~~~~~~~~
rings.cpp:136:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  136 |         for (int i=0;i<candidates.size();i++)
      |                      ~^~~~~~~~~~~~~~~~~~
rings.cpp: In function 'int CountCritical()':
rings.cpp:149:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  149 |         for (int i=0;i<candidates.size();i++)
      |                      ~^~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 29276 KB Output is correct
2 Correct 8 ms 29532 KB Output is correct
3 Correct 7 ms 29276 KB Output is correct
4 Correct 6 ms 29276 KB Output is correct
5 Correct 8 ms 29308 KB Output is correct
6 Correct 7 ms 29532 KB Output is correct
7 Correct 6 ms 29528 KB Output is correct
8 Correct 7 ms 29528 KB Output is correct
9 Correct 8 ms 31580 KB Output is correct
10 Correct 7 ms 29532 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 303 ms 72316 KB Output is correct
2 Correct 613 ms 87404 KB Output is correct
3 Correct 400 ms 78712 KB Output is correct
4 Correct 920 ms 107988 KB Output is correct
5 Correct 920 ms 108000 KB Output is correct
6 Correct 912 ms 106680 KB Output is correct
7 Correct 401 ms 80312 KB Output is correct
8 Correct 1271 ms 104992 KB Output is correct
9 Correct 1335 ms 107728 KB Output is correct
10 Correct 600 ms 118404 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 29276 KB Output is correct
2 Correct 8 ms 29532 KB Output is correct
3 Correct 7 ms 29276 KB Output is correct
4 Correct 6 ms 29276 KB Output is correct
5 Correct 8 ms 29308 KB Output is correct
6 Correct 7 ms 29532 KB Output is correct
7 Correct 6 ms 29528 KB Output is correct
8 Correct 7 ms 29528 KB Output is correct
9 Correct 8 ms 31580 KB Output is correct
10 Correct 7 ms 29532 KB Output is correct
11 Correct 8 ms 31580 KB Output is correct
12 Correct 10 ms 31832 KB Output is correct
13 Correct 11 ms 31836 KB Output is correct
14 Correct 7 ms 29532 KB Output is correct
15 Correct 8 ms 31580 KB Output is correct
16 Correct 9 ms 29788 KB Output is correct
17 Correct 8 ms 29828 KB Output is correct
18 Incorrect 8 ms 31832 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 29276 KB Output is correct
2 Correct 8 ms 29532 KB Output is correct
3 Correct 7 ms 29276 KB Output is correct
4 Correct 6 ms 29276 KB Output is correct
5 Correct 8 ms 29308 KB Output is correct
6 Correct 7 ms 29532 KB Output is correct
7 Correct 6 ms 29528 KB Output is correct
8 Correct 7 ms 29528 KB Output is correct
9 Correct 8 ms 31580 KB Output is correct
10 Correct 7 ms 29532 KB Output is correct
11 Correct 8 ms 31580 KB Output is correct
12 Correct 10 ms 31832 KB Output is correct
13 Correct 11 ms 31836 KB Output is correct
14 Correct 7 ms 29532 KB Output is correct
15 Correct 8 ms 31580 KB Output is correct
16 Correct 9 ms 29788 KB Output is correct
17 Correct 8 ms 29828 KB Output is correct
18 Incorrect 8 ms 31832 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 29276 KB Output is correct
2 Correct 8 ms 29532 KB Output is correct
3 Correct 7 ms 29276 KB Output is correct
4 Correct 6 ms 29276 KB Output is correct
5 Correct 8 ms 29308 KB Output is correct
6 Correct 7 ms 29532 KB Output is correct
7 Correct 6 ms 29528 KB Output is correct
8 Correct 7 ms 29528 KB Output is correct
9 Correct 8 ms 31580 KB Output is correct
10 Correct 7 ms 29532 KB Output is correct
11 Correct 303 ms 72316 KB Output is correct
12 Correct 613 ms 87404 KB Output is correct
13 Correct 400 ms 78712 KB Output is correct
14 Correct 920 ms 107988 KB Output is correct
15 Correct 920 ms 108000 KB Output is correct
16 Correct 912 ms 106680 KB Output is correct
17 Correct 401 ms 80312 KB Output is correct
18 Correct 1271 ms 104992 KB Output is correct
19 Correct 1335 ms 107728 KB Output is correct
20 Correct 600 ms 118404 KB Output is correct
21 Correct 8 ms 31580 KB Output is correct
22 Correct 10 ms 31832 KB Output is correct
23 Correct 11 ms 31836 KB Output is correct
24 Correct 7 ms 29532 KB Output is correct
25 Correct 8 ms 31580 KB Output is correct
26 Correct 9 ms 29788 KB Output is correct
27 Correct 8 ms 29828 KB Output is correct
28 Incorrect 8 ms 31832 KB Output isn't correct
29 Halted 0 ms 0 KB -