oj.uz

Submission #598686

# Submission time Handle Problem Language Result Execution time Memory
598686 2022-07-18T17:38:45 Z andrei_boaca Pipes (CEOI15_pipes) C++14
80 / 100
 919 ms 65536 KB 
#include <bits/stdc++.h>
#pragma GCC opimize("O3")
using namespace std;
vector<vector<int>> muchii;
vector<int> nodes;
int comp1[100005],comp2[100005],lg1[100005],lg2[100005];
bool use[100005];
int n,m;
void dfs(int nod)
{
    use[nod]=1;
    comp2[nod]=lg1[nod];
    for(int z=0;z<muchii[nod].size();z++)
    {
        int node=muchii[nod][z];
        if(node==comp1[nod])
            continue;
        if(!use[node])
        {
            comp1[node]=nod;
            lg1[node]=lg1[nod]+1;
            dfs(node);
            comp2[nod]=min(comp2[nod],comp2[node]);
        }
        else
            comp2[nod]=min(comp2[nod],lg1[node]);
    }
    int cnt=0;
    if(comp2[nod]==lg1[nod]&&comp1[nod]!=0)
    {
        for(int z=0;z<muchii[nod].size();z++)
        {
            int i=muchii[nod][z];
            if(i==comp1[nod])
                cnt++;
        }
        if(cnt==1)
            cout<<comp1[nod]<<' '<<nod<<'\n';
    }
}
void dfs1(int nod)
{
    use[nod]=1;
    nodes.push_back(nod);
    for(int z=0;z<muchii[nod].size();z++)
    {
        int i=muchii[nod][z];
        if(comp1[nod]==comp1[i]&&!use[i])
            dfs1(i);
    }
}
void dfs2(int nod)
{
    use[nod]=1;
    nodes.push_back(nod);
    for(int z=0;z<muchii[nod].size();z++)
    {
        int i=muchii[nod][z];
        if(comp2[nod]==comp2[i]&&!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();
    //nodes.shrink_to_fit();
    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()
{
    ios_base::sync_with_stdio(false);
    cin>>n>>m;
    muchii.resize(n+1);
    for(int i=1;i<=n;i++)
    {
        comp1[i]=i;
        comp2[i]=i;
        lg1[i]=1;
        lg2[i]=1;
    }
    int cnt=0;
    for(int i=1;i<=m;i++)
    {
        int a,b;
        cin>>a>>b;
        if(comp1[a]!=comp1[b])
        {
            dsu_merge1(a,b);
            muchii[a].push_back(b);
            muchii[b].push_back(a);
            cnt++;
        }
        else
        {
            if(comp2[a]!=comp2[b])
            {
                dsu_merge2(a,b);
                muchii[a].push_back(b);
                muchii[b].push_back(a);
                cnt++;
            }
        }
    }
    for(int i=1;i<=n;i++)
    {
        comp1[i]=0;
        comp2[i]=0;
        lg1[i]=0;
        lg2[i]=0;
    }
    for(int i=1;i<=n;i++)
        if(!use[i])
            dfs(i);
    return 0;
}

Compilation message

pipes.cpp:2: warning: ignoring '#pragma GCC opimize' [-Wunknown-pragmas]
    2 | #pragma GCC opimize("O3")
      | 
pipes.cpp: In function 'void dfs(int)':
pipes.cpp:13:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for(int z=0;z<muchii[nod].size();z++)
      |                 ~^~~~~~~~~~~~~~~~~~~
pipes.cpp:31:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |         for(int z=0;z<muchii[nod].size();z++)
      |                     ~^~~~~~~~~~~~~~~~~~~
pipes.cpp: In function 'void dfs1(int)':
pipes.cpp:45:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |     for(int z=0;z<muchii[nod].size();z++)
      |                 ~^~~~~~~~~~~~~~~~~~~
pipes.cpp: In function 'void dfs2(int)':
pipes.cpp:56:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |     for(int z=0;z<muchii[nod].size();z++)
      |                 ~^~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 852 KB Output is correct
2 Correct 4 ms 724 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 78 ms 740 KB Output is correct
2 Correct 77 ms 628 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 137 ms 1612 KB Output is correct
2 Correct 152 ms 1292 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 216 ms 3540 KB Output is correct
2 Correct 236 ms 3396 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 294 ms 9996 KB Output is correct
2 Correct 280 ms 6604 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 507 ms 11344 KB Output is correct
2 Correct 486 ms 8580 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 609 ms 13936 KB Output is correct
2 Correct 603 ms 9276 KB Output is correct

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 838 ms 14000 KB Output is correct
2 Runtime error 847 ms 62240 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 903 ms 13284 KB Output is correct
2 Runtime error 919 ms 65536 KB Memory limit exceeded
3 Halted 0 ms 0 KB -