oj.uz

답안 #877378

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
877378 2023-11-23T07:59:41 Z simona1230 Jail (JOI22_jail) C++17
5 / 100
 1117 ms 180196 KB 
#include <bits/stdc++.h>

using namespace std;
const int maxn=1e6;
int q,n,m;
vector<int> f[200001];
bool test=0;
void read()
{
    cin>>n;
    for(int i=1; i<=n; i++)
        f[i].clear();
    for(int i=1; i<n; i++)
    {
        int x,y;
        cin>>x>>y;
        if(i==1&&x==1&&y==15)test=1;
        if(i==2&&x!=15||i==2&&y!=16)test=0;
        f[x].push_back(y);
        f[y].push_back(x);
    }
}
int num;
int ts[800001];// number of the vertex corresponding
int te[800001];// to the given tree and segment of the hld
int dw[200001];
int up[200001];

vector<int> v[maxn],o[maxn];

void make_tree(int i,int l,int r)
{
    if(l==r)
    {
        ts[i]=num++;
        dw[l]=ts[i];
        te[i]=num++;
        up[l]=te[i];
        //cout<<l<<" "<<r<<" "<<te[i]<<endl;
        return;
    }
    int mid=(l+r)/2;
    ts[i]=num++;
    te[i]=num++;
    //cout<<l<<" "<<r<<" "<<te[i]<<endl;
    make_tree(i*2,l,mid);
    make_tree(i*2+1,mid+1,r);
    int il=ts[i*2];
    int ir=ts[i*2+1];
    v[ts[i]].push_back(il);
    v[ts[i]].push_back(ir);
    o[il].push_back(ts[i]);
    o[ir].push_back(ts[i]);
    il=te[i*2];
    ir=te[i*2+1];
    v[il].push_back(te[i]);
    v[ir].push_back(te[i]);
    o[te[i]].push_back(il);
    o[te[i]].push_back(ir);
}

int used[200001];
int jump[200001][21];
int sz[200001];
int pos[200001];// new number of vertex i in original graph
int chain[200001];// leader of the chain in which i is
int maxx[200001];
int lvl[200001];
void necessities(int i,int h)
{
    sz[i]=1;
    used[i]=1;
    for(int j=0; j<f[i].size(); j++)
    {
        int nb=f[i][j];
        if(!used[nb])
        {
            necessities(nb,h+1);
            sz[i]+=sz[nb];
            if(sz[maxx[i]]<sz[nb])maxx[i]=nb;
        }
    }
}
int cnt=1;
void hld(int i,int lead,int h)
{
    pos[i]=cnt++;
    chain[pos[i]]=pos[lead];
    lvl[pos[i]]=h;
    if(maxx[i])
    {
        hld(maxx[i],lead,h+1);
        jump[pos[maxx[i]]][0]=pos[i];
    }
    for(int j=0; j<f[i].size(); j++)
    {
        int nb=f[i][j];
        if(pos[nb]==0)
        {
            hld(nb,nb,h+1);
            jump[pos[nb]][0]=pos[i];
        }
    }
}
void prec()
{
    for(int j=1; j<=20; j++)
    {
        for(int i=1; i<=n; i++)
        {
            jump[i][j]=jump[jump[i][j-1]][j-1];
            //cout<<i<<" "<<j<<" "<<jump[i][j]<<endl;
        }
    }
}
int make_jump(int x,int k)
{
    for(int i=20; i>=0; i--)
        if(k&(1<<i))
            x=jump[x][i];
    return x;
}
int lca(int x,int y)
{
    if(lvl[x]>lvl[y])swap(x,y);
    y=make_jump(y,abs(lvl[y]-lvl[x]));
    //cout<<x<<" "<<y<<endl;
    if(x==y)return x;
    for(int i=20; i>=0; i--)
    {
        if(jump[x][i]!=jump[y][i])
        {
            x=jump[x][i];
            y=jump[y][i];
        }
    }
    return jump[x][0];
}
void update(int i,int l,int r,int ql,int qr,int pr)
{
    if(ql>qr)return;
    if(r<ql||l>qr)return;
    if(ql<=l&&r<=qr)
    {
        //cout<<l<<"-"<<r<<endl;
        int idx=ts[i];
        //cout<<idx<<endl;
        v[pr].push_back(idx);
        o[idx].push_back(pr);
        idx=te[i];
        //cout<<idx<<endl;
        v[idx].push_back(pr);
        o[pr].push_back(idx);
        return;
    }
    int mid=(l+r)/2;
    update(i*2,l,mid,ql,qr,pr);
    update(i*2+1,mid+1,r,ql,qr,pr);
}
void make_graph()
{
    /*for(int i=1;i<=n;i++)
        cout<<chain[i]<<" ";
    cout<<endl;*/
    for(int i=1; i<=m; i++)
    {
        int x,y;
        cin>>x>>y;
        x=pos[x];
        y=pos[y];
        //cout<<i<<" "<<dw[pos[x]]<<" "<<up[pos[y]]<<endl;
        v[dw[x]].push_back(i);
        o[i].push_back(dw[x]);
        v[i].push_back(up[y]);
        o[up[y]].push_back(i);
        int ver=lca(x,y);
        //cout<<ver<<endl;
        int c1=x;

        int br = 0;

        while(1)
        {
            int c2=chain[c1];
            if(lvl[c2]<lvl[ver])c2=ver;
            update(1,1,n,c2,c1,i);
            //cout<<c2<<" "<<c1<<endl;
            if(c2==ver)break;
            c1=jump[c2][0];

            br++;
            //if(br >= n + 1) assert(false);

        }
        c1=y;

        br = 0;

        while(1)
        {
            int c2=chain[c1];
            if(lvl[c2]<lvl[ver])c2=ver;
            update(1,1,n,c2,c1,i);
            //cout<<c2<<" "<<c1<<endl;
            if(c2==ver)break;
            c1=jump[c2][0];

            br++;
            if(br >= n + 1) assert(false);


        }
    }
}
int used1[maxn];
stack<int> st;
void dfs1(int i)
{
    used1[i]=1;
    for(int j=0; j<v[i].size(); j++)
    {
        int nb=v[i][j];
        if(!used1[nb])
        {
            dfs1(nb);
        }
    }
    st.push(i);
}
int used2[maxn];
void dfs2(int i)
{
    used2[i]=1;
    for(int j=0; j<o[i].size(); j++)
    {
        int nb=o[i][j];
        if(!used2[nb])
        {
            dfs2(nb);
        }
    }
}
void check()
{
    memset(used1,0,sizeof(used1));
    memset(used2,0,sizeof(used2));
    for(int i=1;i<=m;i++)
    {
        if(!used1[i])dfs1(i);
    }
    int cnt=0;
    while(st.size())
    {
        int vr=st.top();
        st.pop();
        if(vr<=m&&!used2[vr])
        {
            cnt++;
            dfs2(vr);
        }
    }
    if(cnt==m)cout<<"Yes"<<endl;
    else cout<<"No"<<endl;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>q;
    while(q--)
    {
        for(int i=1; i<=num; i++)
        {
            o[i].clear();
            v[i].clear();
        }
        memset(maxx,0,sizeof(maxx));
        memset(used,0,sizeof(used));
        read();
        cnt=1;
        necessities(1,1);
        hld(1,1,1);
        prec();
        cin>>m;
        num=m+1;
        make_tree(1,1,n);

        make_graph();

        /*for(int i=1;i<num;i++)
        {
            cout<<i<<": ";
            for(int j=0;j<v[i].size();j++)
                cout<<v[i][j]<<" ";
            cout<<endl;
        }*/
        check();
        //if(test)assert(false);
    }
    return 0;
}

Compilation message

jail.cpp: In function 'void read()':
jail.cpp:18:16: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   18 |         if(i==2&&x!=15||i==2&&y!=16)test=0;
      |            ~~~~^~~~~~~
jail.cpp: In function 'void necessities(int, int)':
jail.cpp:73:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |     for(int j=0; j<f[i].size(); j++)
      |                  ~^~~~~~~~~~~~
jail.cpp: In function 'void hld(int, int, int)':
jail.cpp:95:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   95 |     for(int j=0; j<f[i].size(); j++)
      |                  ~^~~~~~~~~~~~
jail.cpp: In function 'void dfs1(int)':
jail.cpp:220:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  220 |     for(int j=0; j<v[i].size(); j++)
      |                  ~^~~~~~~~~~~~
jail.cpp: In function 'void dfs2(int)':
jail.cpp:234:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  234 |     for(int j=0; j<o[i].size(); j++)
      |                  ~^~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 72284 KB Output is correct
2 Correct 17 ms 72452 KB Output is correct
3 Correct 14 ms 72460 KB Output is correct
4 Correct 92 ms 72280 KB Output is correct
5 Correct 184 ms 72516 KB Output is correct
6 Correct 18 ms 72540 KB Output is correct
7 Correct 19 ms 72536 KB Output is correct
8 Correct 20 ms 72536 KB Output is correct
9 Correct 69 ms 74772 KB Output is correct
10 Correct 116 ms 121548 KB Output is correct
11 Correct 175 ms 72284 KB Output is correct
12 Correct 251 ms 72592 KB Output is correct
13 Correct 235 ms 132688 KB Output is correct
14 Correct 248 ms 133132 KB Output is correct
15 Correct 585 ms 142840 KB Output is correct
16 Correct 1117 ms 180196 KB Output is correct
17 Correct 293 ms 148528 KB Output is correct
18 Correct 282 ms 141908 KB Output is correct
19 Correct 280 ms 144660 KB Output is correct
20 Correct 292 ms 144548 KB Output is correct
21 Correct 325 ms 147056 KB Output is correct
22 Correct 206 ms 129872 KB Output is correct

Subtask #2
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 72284 KB Output is correct
2 Correct 14 ms 72364 KB Output is correct
3 Correct 18 ms 72372 KB Output is correct
4 Correct 18 ms 72540 KB Output is correct
5 Incorrect 18 ms 72540 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 72284 KB Output is correct
2 Correct 14 ms 72364 KB Output is correct
3 Correct 18 ms 72372 KB Output is correct
4 Correct 18 ms 72540 KB Output is correct
5 Incorrect 18 ms 72540 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #4
0 / 28.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 72284 KB Output is correct
2 Correct 14 ms 72364 KB Output is correct
3 Correct 18 ms 72372 KB Output is correct
4 Correct 18 ms 72540 KB Output is correct
5 Incorrect 18 ms 72540 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 72284 KB Output is correct
2 Correct 14 ms 72364 KB Output is correct
3 Correct 18 ms 72372 KB Output is correct
4 Correct 18 ms 72540 KB Output is correct
5 Incorrect 18 ms 72540 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 72280 KB Output is correct
2 Correct 14 ms 72284 KB Output is correct
3 Correct 16 ms 72280 KB Output is correct
4 Correct 14 ms 72284 KB Output is correct
5 Correct 165 ms 72280 KB Output is correct
6 Correct 17 ms 72540 KB Output is correct
7 Incorrect 18 ms 72540 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 72284 KB Output is correct
2 Correct 17 ms 72452 KB Output is correct
3 Correct 14 ms 72460 KB Output is correct
4 Correct 92 ms 72280 KB Output is correct
5 Correct 184 ms 72516 KB Output is correct
6 Correct 18 ms 72540 KB Output is correct
7 Correct 19 ms 72536 KB Output is correct
8 Correct 20 ms 72536 KB Output is correct
9 Correct 69 ms 74772 KB Output is correct
10 Correct 116 ms 121548 KB Output is correct
11 Correct 175 ms 72284 KB Output is correct
12 Correct 251 ms 72592 KB Output is correct
13 Correct 235 ms 132688 KB Output is correct
14 Correct 248 ms 133132 KB Output is correct
15 Correct 585 ms 142840 KB Output is correct
16 Correct 1117 ms 180196 KB Output is correct
17 Correct 293 ms 148528 KB Output is correct
18 Correct 282 ms 141908 KB Output is correct
19 Correct 280 ms 144660 KB Output is correct
20 Correct 292 ms 144548 KB Output is correct
21 Correct 325 ms 147056 KB Output is correct
22 Correct 206 ms 129872 KB Output is correct
23 Correct 14 ms 72284 KB Output is correct
24 Correct 14 ms 72364 KB Output is correct
25 Correct 18 ms 72372 KB Output is correct
26 Correct 18 ms 72540 KB Output is correct
27 Incorrect 18 ms 72540 KB Output isn't correct
28 Halted 0 ms 0 KB -