Submission #594267

#	Time	Username	Problem	Language	Result	Execution time	Memory
594267		andrei_boaca	Pipes (CEOI15_pipes)	C++14	70 / 100	3012 ms	19868 KiB

pipes

#include <bits/stdc++.h>
#pragma GCC opimize("O3")
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 z=0;z<muchii1[nod].size();z++)
    {
        int node=muchii1[nod][z];
        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 z=0;z<muchii2[nod].size();z++)
    {
        int node=muchii2[nod][z];
        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 z=0;z<muchii1[nod].size();z++)
        {
            int i=muchii1[nod][z];
            if(i==par[nod])
                cnt++;
        }
        for(int z=0;z<muchii2[nod].size();z++)
        {
            int i=muchii2[nod][z];
            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 z=0;z<muchii1[nod].size();z++)
    {
        int i=muchii1[nod][z];
        if(!use[i])
            dfs1(i);
    }
}
void dfs2(int nod)
{
    use[nod]=1;
    nodes.push_back(nod);
    for(int z=0;z<muchii2[nod].size();z++)
    {
        int i=muchii2[nod][z];
        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;
    }
    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);
            muchii1[a].push_back(b);
            muchii1[b].push_back(a);
            cnt++;
        }
        else
        {
            if(comp2[a]!=comp2[b])
            {
                dsu_merge2(a,b);
                muchii2[a].push_back(b);
                muchii2[b].push_back(a);
                cnt++;
            }
        }
    }
    for(int i=1;i<=n;i++)
        if(!use[i])
            dfs(i);
    return 0;
}

Compilation message (stderr)

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<muchii1[nod].size();z++)
      |                 ~^~~~~~~~~~~~~~~~~~~~
pipes.cpp:28:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     for(int z=0;z<muchii2[nod].size();z++)
      |                 ~^~~~~~~~~~~~~~~~~~~~
pipes.cpp:46:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |         for(int z=0;z<muchii1[nod].size();z++)
      |                     ~^~~~~~~~~~~~~~~~~~~~
pipes.cpp:52:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |         for(int z=0;z<muchii2[nod].size();z++)
      |                     ~^~~~~~~~~~~~~~~~~~~~
pipes.cpp: In function 'void dfs1(int)':
pipes.cpp:66:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |     for(int z=0;z<muchii1[nod].size();z++)
      |                 ~^~~~~~~~~~~~~~~~~~~~
pipes.cpp: In function 'void dfs2(int)':
pipes.cpp:77:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |     for(int z=0;z<muchii2[nod].size();z++)
      |                 ~^~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10