oj.uz

답안 #877367

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
877367 2023-11-23T07:52:55 Z simona1230 Jail (JOI22_jail) C++17
5 / 100
 1075 ms 1048576 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(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,min(mid,qr),pr);
    update(i*2+1,mid+1,r,max(ql,mid+1),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();
        if(test)assert(false);
        /*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();
    }
    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 16 ms 72280 KB Output is correct
2 Correct 14 ms 72280 KB Output is correct
3 Correct 14 ms 72284 KB Output is correct
4 Correct 89 ms 72788 KB Output is correct
5 Correct 181 ms 73140 KB Output is correct
6 Correct 18 ms 72540 KB Output is correct
7 Correct 18 ms 72540 KB Output is correct
8 Correct 22 ms 72540 KB Output is correct
9 Correct 66 ms 75796 KB Output is correct
10 Correct 116 ms 123240 KB Output is correct
11 Correct 180 ms 72560 KB Output is correct
12 Correct 230 ms 73544 KB Output is correct
13 Correct 230 ms 134480 KB Output is correct
14 Correct 231 ms 134992 KB Output is correct
15 Correct 551 ms 144852 KB Output is correct
16 Correct 1075 ms 182724 KB Output is correct
17 Correct 296 ms 150372 KB Output is correct
18 Correct 238 ms 144684 KB Output is correct
19 Correct 275 ms 146512 KB Output is correct
20 Correct 281 ms 146804 KB Output is correct
21 Correct 322 ms 148820 KB Output is correct
22 Correct 182 ms 131664 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 72440 KB Output is correct
3 Correct 17 ms 72536 KB Output is correct
4 Runtime error 65 ms 138068 KB Execution killed with signal 6
5 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 72440 KB Output is correct
3 Correct 17 ms 72536 KB Output is correct
4 Runtime error 65 ms 138068 KB Execution killed with signal 6
5 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 72440 KB Output is correct
3 Correct 17 ms 72536 KB Output is correct
4 Runtime error 65 ms 138068 KB Execution killed with signal 6
5 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 72440 KB Output is correct
3 Correct 17 ms 72536 KB Output is correct
4 Runtime error 65 ms 138068 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 72284 KB Output is correct
2 Correct 14 ms 72284 KB Output is correct
3 Correct 15 ms 72460 KB Output is correct
4 Correct 14 ms 72536 KB Output is correct
5 Correct 163 ms 72600 KB Output is correct
6 Correct 17 ms 72536 KB Output is correct
7 Runtime error 520 ms 1048576 KB Execution killed with signal 9
8 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 16 ms 72280 KB Output is correct
2 Correct 14 ms 72280 KB Output is correct
3 Correct 14 ms 72284 KB Output is correct
4 Correct 89 ms 72788 KB Output is correct
5 Correct 181 ms 73140 KB Output is correct
6 Correct 18 ms 72540 KB Output is correct
7 Correct 18 ms 72540 KB Output is correct
8 Correct 22 ms 72540 KB Output is correct
9 Correct 66 ms 75796 KB Output is correct
10 Correct 116 ms 123240 KB Output is correct
11 Correct 180 ms 72560 KB Output is correct
12 Correct 230 ms 73544 KB Output is correct
13 Correct 230 ms 134480 KB Output is correct
14 Correct 231 ms 134992 KB Output is correct
15 Correct 551 ms 144852 KB Output is correct
16 Correct 1075 ms 182724 KB Output is correct
17 Correct 296 ms 150372 KB Output is correct
18 Correct 238 ms 144684 KB Output is correct
19 Correct 275 ms 146512 KB Output is correct
20 Correct 281 ms 146804 KB Output is correct
21 Correct 322 ms 148820 KB Output is correct
22 Correct 182 ms 131664 KB Output is correct
23 Correct 14 ms 72284 KB Output is correct
24 Correct 14 ms 72440 KB Output is correct
25 Correct 17 ms 72536 KB Output is correct
26 Runtime error 65 ms 138068 KB Execution killed with signal 6
27 Halted 0 ms 0 KB -