Submission #927348

#	Time	Username	Problem	Language	Result	Execution time	Memory
927348		andrei_boaca	Jail (JOI22_jail)	C++17	0 / 100	19 ms	33884 KiB

jail

#include <bits/stdc++.h>

using namespace std;
typedef pair<int,int> pii;
int t,n,m,A[120005],B[120005],in[120005],out[120005],timp,par[120005],niv[1200005],dp[21][120005],nr[120005];
bool isheavy[120005];
vector<int> muchii[120005];
vector<vector<int>> v;
vector<set<pii>> suf,active;
set<pii> vtm;
vector<vector<set<int>>> arb;
vector<int> tati;
vector<set<int>> emp;
int where[120005],poz[120005];
vector<int> stiva;
bool use[120005];
bool isancestor(int a,int b)
{
    return in[a]<=in[b]&&out[a]>=out[b];
}
int LCA(int a,int b)
{
    if(niv[a]>niv[b])
        swap(a,b);
    if(isancestor(a,b))
        return a;
    for(int i=18;i>=0;i--)
        if(dp[i][a]!=0&&!isancestor(dp[i][a],b))
            a=dp[i][a];
    return par[a];
}
int dist(int a,int b)
{
    int lca=LCA(a,b);
    return niv[a]+niv[b]-2*niv[lca];
}
void initdfs(int nod)
{
    nr[nod]=1;
    timp++;
    in[nod]=timp;
    dp[0][nod]=par[nod];
    for(int i=1;i<=18;i++)
        dp[i][nod]=dp[i-1][dp[i-1][nod]];
    int who=0,maxim=0;
    for(int i:muchii[nod])
        if(i!=par[nod])
        {
            par[i]=nod;
            niv[i]=niv[nod]+1;
            initdfs(i);
            nr[nod]+=nr[i];
            if(nr[i]>maxim)
            {
                maxim=nr[i];
                who=i;
            }
        }
    if(who!=0)
        isheavy[who]=1;
    out[nod]=timp;
}
void buildhld()
{
    for(int i=1;i<=n;i++)
    {
        bool ok=1;
        for(int j:muchii[i])
            if(j!=par[i]&&isheavy[j])
            {
                ok=0;
                break;
            }
        if(ok)
        {
            vector<int> nodes;
            int nod=i;
            while(true)
            {
                nodes.push_back(nod);
                if(!isheavy[nod])
                    break;
                nod=par[nod];
            }
            for(int i=0;i<nodes.size();i++)
            {
                where[nodes[i]]=v.size();
                poz[nodes[i]]=i;
            }
            v.push_back(nodes);
            arb.push_back(emp);
            suf.push_back(vtm);
            active.push_back(vtm);
            int lg=arb.size();
            lg--;
            arb[lg].resize(4*(int)nodes.size()+5);
        }
    }
}
void addnode(int nod,int ind,int add)
{
    int chain=where[nod];
    int p=poz[nod];
    if(add==1)
        active[chain].insert({p,ind});
    else
        active[chain].erase({p,ind});
}
void update(int chain,int nod,int st,int dr,int a,int b,int val,int add)
{
    if(st>=a&&dr<=b)
    {
        if(add==1)
            arb[chain][nod].insert(val);
        else
            arb[chain][nod].erase(val);
        return;
    }
    int mij=(st+dr)/2;
    if(a<=mij)
        update(chain,nod*2,st,mij,a,b,val,add);
    if(b>mij)
        update(chain,nod*2+1,mij+1,dr,a,b,val,add);
}
void query(int chain,int nod,int st,int dr,int p)
{
    tati.push_back(nod);
    if(st==dr)
        return;
    int mij=(st+dr)/2;
    if(p<=mij)
        query(chain,nod*2,st,mij,p);
    if(p>mij)
        query(chain,nod*2+1,mij+1,dr,p);
}
void addseg(int a,int b,int ind,int add)
{
    int lca=LCA(a,b);
    while(niv[a]>=niv[lca])
    {
        int p=poz[a];
        int chain=where[a];
        int last=v[chain].size();
        last--;
        if(where[a]==where[lca])
            last=poz[lca];
        if(p<=last)
        {
            if(last!=(int)v[chain].size()-1)
                update(chain,1,0,(int)v[chain].size()-1,p,last,ind,add);
            else
            {
                pii x={p,ind};
                if(add==1)
                    suf[chain].insert(x);
                else
                    suf[chain].erase(x);
            }
        }
        a=par[v[chain][last]];
    }

    while(niv[b]>niv[lca])
    {
        int p=poz[b];
        int chain=where[b];
        int last=v[chain].size();
        last--;
        if(where[b]==where[lca])
            last=poz[lca]-1;
        if(p<=last)
        {
            if(last!=(int)v[chain].size()-1)
                update(chain,1,0,(int)v[chain].size()-1,p,last,ind,add);
            else
            {
                pii x={p,ind};
                if(add==1)
                    suf[chain].insert(x);
                else
                    suf[chain].erase(x);
            }
        }
        b=par[v[chain][last]];
    }
}
void dfs1(int nod)
{
    use[nod]=1;
    addseg(A[nod],B[nod],nod,-1);
    addnode(B[nod],nod,-1);
    int chain=where[A[nod]];
    int p=poz[A[nod]];
    while(!suf[chain].empty())
    {
        auto it=suf[chain].upper_bound({p,1e9});
        if(it==suf[chain].begin())
            break;
        it=prev(it);
        int x=(*it).second;
        dfs1(x);
    }
    tati.clear();
    query(chain,1,0,v[chain].size()-1,p);
    for(int x:tati)
    {
        while(!arb[chain][x].empty())
        {
            int y=*arb[chain][x].begin();
            dfs1(y);
        }
    }
    int a=A[nod];
    int b=B[nod];
    int lca=LCA(a,b);
    while(a!=0&&niv[a]>=niv[lca])
    {
        p=poz[a];
        chain=where[a];
        int last=v[chain].size();
        last--;
        if(where[a]==where[lca])
            last=poz[lca];
        while(!active[chain].empty())
        {
            auto it=active[chain].lower_bound({p,0});
            if(it==active[chain].end())
                break;
            if((*it).first>last)
                break;
            int x=(*it).second;
            dfs1(x);
        }
        a=par[v[chain][last]];
    }
    while(b!=0&&niv[b]>niv[lca])
    {
        p=poz[b];
        chain=where[b];
        int last=v[chain].size();
        last--;
        if(where[a]==where[lca])
            last=poz[lca]-1;
        while(!active[chain].empty())
        {
            auto it=active[chain].lower_bound({p,0});
            if(it==active[chain].end())
                break;
            if((*it).first>last)
                break;
            int x=(*it).second;
            dfs1(x);
        }
        b=par[v[chain][last]];
    }
    stiva.push_back(nod);
}
void dfs2(int nod)
{
    use[nod]=1;
    addseg(A[nod],B[nod],nod,-1);
    addnode(A[nod],nod,-1);
    int chain=where[B[nod]];
    int p=poz[B[nod]];
    while(!suf[chain].empty())
    {
        auto it=suf[chain].upper_bound({p,1e9});
        if(it==suf[chain].begin())
            break;
        it=prev(it);
        int x=(*it).second;
        dfs2(x);
    }
    tati.clear();
    query(chain,1,0,v[chain].size()-1,p);
    for(int x:tati)
    {
        while(!arb[chain][x].empty())
        {
            int y=*arb[chain][x].begin();
            dfs2(y);
        }
    }
    int a=A[nod];
    int b=B[nod];
    int lca=LCA(a,b);
    while(a!=0&&niv[a]>=niv[lca])
    {
        p=poz[a];
        chain=where[a];
        int last=v[chain].size();
        last--;
        if(where[a]==where[lca])
            last=poz[lca];
        while(!active[chain].empty())
        {
            auto it=active[chain].lower_bound({p,0});
            if(it==active[chain].end())
                break;
            if((*it).first>last)
                break;
            int x=(*it).second;
            dfs2(x);
        }
        a=par[v[chain][last]];
    }
    while(b!=0&&niv[b]>niv[lca])
    {
        p=poz[b];
        chain=where[b];
        int last=v[chain].size();
        last--;
        if(where[a]==where[lca])
            last=poz[lca]-1;
        while(!active[chain].empty())
        {
            auto it=active[chain].lower_bound({p,0});
            if(it==active[chain].end())
                break;
            if((*it).first>last)
                break;
            int x=(*it).second;
            dfs2(x);
        }
        b=par[v[chain][last]];
    }
}
void solve()
{
    cin>>n;
    timp=0;
    v.clear();
    suf.clear();
    active.clear();
    arb.clear();
    arb.shrink_to_fit();
    for(int i=1;i<=n;i++)
    {
        muchii[i].clear();
        isheavy[i]=0;
    }
    for(int i=1;i<n;i++)
    {
        int a,b;
        cin>>a>>b;
        muchii[a].push_back(b);
        muchii[b].push_back(a);
    }
    niv[1]=1;
    initdfs(1);
    cin>>m;
    for(int i=1;i<=m;i++)
        cin>>A[i]>>B[i];
    buildhld();
    stiva.clear();
    for(int i=1;i<=m;i++)
    {
        addseg(A[i],B[i],i,+1);
        addnode(B[i],i,+1);
    }
    for(int i=1;i<=m;i++)
        if(!use[i])
            dfs1(i);
    for(int i=0;i<v.size();i++)
        assert(suf[i].empty());
    reverse(stiva.begin(),stiva.end());
    for(int i=1;i<=m;i++)
    {
        use[i]=0;
        addseg(A[i],B[i],i,+1);
        addnode(A[i],i,+1);
    }
    int nrcomp=0;
    for(int i:stiva)
        if(!use[i])
        {
            nrcomp++;
            dfs2(i);
        }
    if(nrcomp==m)
        cout<<"Yes\n";
    else
        cout<<"No\n";
    /*for(int i=1;i<=m;i++)
        for(int j=1;j<=m;j++)
            if(i!=j)
            {
                if(onchain(A[j],A[i],B[i]))
                {
                    edges[j].push_back(i);
                    grad[i]++;
                }
                if(onchain(B[j],A[i],B[i]))
                {
                    edges[i].push_back(j);
                    grad[j]++;
                }
            }*/

}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cin>>t;
    while(t--)
        solve();
    return 0;
}

Compilation message (stderr)

jail.cpp: In function 'void buildhld()':
jail.cpp:85:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |             for(int i=0;i<nodes.size();i++)
      |                         ~^~~~~~~~~~~~~
jail.cpp: In function 'void solve()':
jail.cpp:364:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  364 |     for(int i=0;i<v.size();i++)
      |                 ~^~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23