oj.uz

Submission #594260

# Submission time Handle Problem Language Result Execution time Memory
594260 2022-07-12T09:41:31 Z andrei_boaca Pipes (CEOI15_pipes) C++14
40 / 100
 3086 ms 65536 KB 
#include <bits/stdc++.h>

using namespace std;
vector<vector<int>> muchii1,muchii2;
vector<int> nodes;
int comp1[100005],comp2[100005],par[100005],niv[100005],nivmin[100005],lg1[100005],lg2[100005];
bool use[100005];
int n,m;
void dfs(int nod)
{
    use[nod]=1;
    nivmin[nod]=niv[nod];
    for(int i:muchii1[nod])
    {
        int node=i;
        if(node==par[nod])
            continue;
        if(!use[node])
        {
            par[node]=nod;
            niv[node]=niv[nod]+1;
            dfs(node);
            nivmin[nod]=min(nivmin[nod],nivmin[node]);
        }
        else
            nivmin[nod]=min(nivmin[nod],niv[node]);
    }
    for(int i:muchii2[nod])
    {
        int node=i;
        if(node==par[nod])
            continue;
        if(!use[node])
        {
            par[node]=nod;
            niv[node]=niv[nod]+1;
            dfs(node);
            nivmin[nod]=min(nivmin[nod],nivmin[node]);
        }
        else
            nivmin[nod]=min(nivmin[nod],niv[node]);
    }
    int cnt=0;
    if(nivmin[nod]==niv[nod]&&par[nod]!=0)
    {
        for(int i:muchii1[nod])
            if(i==par[nod])
                cnt++;
        for(int i:muchii2[nod])
            if(i==par[nod])
                cnt++;
        if(cnt==1)
            cout<<par[nod]<<' '<<nod<<'\n';
    }
}
void dfs1(int nod)
{
    use[nod]=1;
    nodes.push_back(nod);
    for(int i:muchii1[nod])
        if(!use[i])
            dfs1(i);
}
void dfs2(int nod)
{
    use[nod]=1;
    nodes.push_back(nod);
    for(int i:muchii2[nod])
        if(!use[i])
            dfs2(i);
}
void dsu_merge1(int a,int b)
{
    int c1=comp1[a],c2=comp1[b];
    if(lg1[c1]<lg1[c2])
    {
        swap(c1,c2);
        swap(a,b);
    }
    nodes.clear();
    dfs1(b);
    for(int i:nodes)
    {
        comp1[i]=c1;
        use[i]=0;
    }
    lg1[c1]+=lg1[c2];
    lg1[c2]=0;
}
void dsu_merge2(int a,int b)
{
    int c1=comp2[a],c2=comp2[b];
    if(lg2[c1]<lg2[c2])
    {
        swap(c1,c2);
        swap(a,b);
    }
    nodes.clear();
    dfs2(b);
    for(int i:nodes)
    {
        comp2[i]=c1;
        use[i]=0;
    }
    lg2[c1]+=lg2[c2];
    lg2[c2]=0;
}
int main()
{
    cin>>n>>m;
    muchii1.resize(n+1);
    muchii2.resize(n+1);
    for(int i=1;i<=n;i++)
    {
        comp1[i]=i;
        comp2[i]=i;
        lg1[i]=1;
        lg2[i]=1;
    }
    for(int i=1;i<=m;i++)
    {
        int a,b;
        cin>>a>>b;
        if(comp1[a]!=comp1[b])
        {
            dsu_merge1(a,b);
            muchii1[a].push_back(b);
            muchii1[b].push_back(a);
        }
        else
        {
            if(comp2[a]!=comp2[b])
            {
                dsu_merge2(a,b);
                muchii2[a].push_back(b);
                muchii2[b].push_back(a);
            }
        }
    }
    for(int i=1;i<=n;i++)
        if(!use[i])
            dfs(i);
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 1232 KB Output is correct
2 Correct 8 ms 1084 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 268 ms 1272 KB Output is correct
2 Correct 293 ms 872 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 439 ms 2304 KB Output is correct
2 Correct 581 ms 13008 KB Output is correct

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 735 ms 4988 KB Output is correct
2 Runtime error 657 ms 18644 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1052 ms 14060 KB Output is correct
2 Runtime error 851 ms 28876 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1536 ms 17304 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 2044 ms 59304 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 2565 ms 65536 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 3086 ms 65536 KB Memory limit exceeded
2 Halted 0 ms 0 KB -