oj.uz

답안 #877388

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
877388 2023-11-23T08:04:16 Z simona1230 Jail (JOI22_jail) C++17
5 / 100
 1107 ms 180448 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 22 ms 72280 KB Output is correct
2 Correct 15 ms 72484 KB Output is correct
3 Correct 14 ms 72284 KB Output is correct
4 Correct 94 ms 72528 KB Output is correct
5 Correct 194 ms 72540 KB Output is correct
6 Correct 18 ms 72536 KB Output is correct
7 Correct 18 ms 72540 KB Output is correct
8 Correct 20 ms 72596 KB Output is correct
9 Correct 65 ms 74744 KB Output is correct
10 Correct 115 ms 121632 KB Output is correct
11 Correct 167 ms 72284 KB Output is correct
12 Correct 199 ms 72540 KB Output is correct
13 Correct 240 ms 132692 KB Output is correct
14 Correct 240 ms 133144 KB Output is correct
15 Correct 583 ms 142800 KB Output is correct
16 Correct 1107 ms 180448 KB Output is correct
17 Correct 311 ms 148488 KB Output is correct
18 Correct 343 ms 141904 KB Output is correct
19 Correct 287 ms 144724 KB Output is correct
20 Correct 290 ms 144564 KB Output is correct
21 Correct 346 ms 147100 KB Output is correct
22 Correct 212 ms 129728 KB Output is correct

Subtask #2
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 72280 KB Output is correct
2 Correct 15 ms 72284 KB Output is correct
3 Correct 18 ms 72476 KB Output is correct
4 Correct 18 ms 72540 KB Output is correct
5 Incorrect 20 ms 72432 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 72280 KB Output is correct
2 Correct 15 ms 72284 KB Output is correct
3 Correct 18 ms 72476 KB Output is correct
4 Correct 18 ms 72540 KB Output is correct
5 Incorrect 20 ms 72432 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #4
0 / 28.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 72280 KB Output is correct
2 Correct 15 ms 72284 KB Output is correct
3 Correct 18 ms 72476 KB Output is correct
4 Correct 18 ms 72540 KB Output is correct
5 Incorrect 20 ms 72432 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 72280 KB Output is correct
2 Correct 15 ms 72284 KB Output is correct
3 Correct 18 ms 72476 KB Output is correct
4 Correct 18 ms 72540 KB Output is correct
5 Incorrect 20 ms 72432 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 15 ms 72280 KB Output is correct
2 Correct 14 ms 72284 KB Output is correct
3 Correct 14 ms 72284 KB Output is correct
4 Correct 16 ms 72312 KB Output is correct
5 Correct 169 ms 72280 KB Output is correct
6 Correct 20 ms 72540 KB Output is correct
7 Incorrect 18 ms 72564 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 22 ms 72280 KB Output is correct
2 Correct 15 ms 72484 KB Output is correct
3 Correct 14 ms 72284 KB Output is correct
4 Correct 94 ms 72528 KB Output is correct
5 Correct 194 ms 72540 KB Output is correct
6 Correct 18 ms 72536 KB Output is correct
7 Correct 18 ms 72540 KB Output is correct
8 Correct 20 ms 72596 KB Output is correct
9 Correct 65 ms 74744 KB Output is correct
10 Correct 115 ms 121632 KB Output is correct
11 Correct 167 ms 72284 KB Output is correct
12 Correct 199 ms 72540 KB Output is correct
13 Correct 240 ms 132692 KB Output is correct
14 Correct 240 ms 133144 KB Output is correct
15 Correct 583 ms 142800 KB Output is correct
16 Correct 1107 ms 180448 KB Output is correct
17 Correct 311 ms 148488 KB Output is correct
18 Correct 343 ms 141904 KB Output is correct
19 Correct 287 ms 144724 KB Output is correct
20 Correct 290 ms 144564 KB Output is correct
21 Correct 346 ms 147100 KB Output is correct
22 Correct 212 ms 129728 KB Output is correct
23 Correct 15 ms 72280 KB Output is correct
24 Correct 15 ms 72284 KB Output is correct
25 Correct 18 ms 72476 KB Output is correct
26 Correct 18 ms 72540 KB Output is correct
27 Incorrect 20 ms 72432 KB Output isn't correct
28 Halted 0 ms 0 KB -