oj.uz

Submission #646307

# Submission time Handle Problem Language Result Execution time Memory
646307 2022-09-29T13:20:19 Z victor_gao Jail (JOI22_jail) C++17
0 / 100
 13 ms 9328 KB 
//#pragma GCC optimize("Ofast,unroll-loops,O3")
//#pragma GCC optimize("avx,avx2,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,fma,tune=native")
#include<bits/stdc++.h>
//#include<bits/extc++.h>
//#pragma pack(1)
#define fast ios::sync_with_stdio(0); cin.tie(0);
#define int long long
#define pii pair<int,int>
#define x first
#define y second
#define N 120015
using namespace std;
//using namespace __gnu_pbds;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//typedef tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update> order_multiset;
//typedef tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> order_set;
int n,m,st[N],ed[N],fa[N],dep[N],dfn[N],dft=0,low[N],nscc=0,lca[N];
int ac[25][N],in[N],out[N],t=0;
bool ins[N],vis[N][2];
stack<int>s;
pii pos[N];
vector<int>g[N],ng[N],scc[N];
void dfs(int p,int lp){
    fa[p]=lp; ac[0][p]=lp;
    dep[p]=dep[lp]+1; in[p]=++t;
    for (auto i:g[p]){
        if (i!=lp) dfs(i,p);
    }
    out[p]=++t;
}
void build(){
    for (int i=1;i<=20;i++){
        for (int j=1;j<=n;j++)
            ac[i][j]=ac[i-1][ac[i-1][j]];
    }
}
bool check(int a,int b){
    return in[a]<=in[b]&&out[a]>=out[b];
}
int LCA(int a,int b){
    if (check(a,b)) return a;
    else if (check(b,a)) return b;
    for (int i=20;i>=0;i--){
        if (!check(ac[i][a],b)) a=ac[i][a];
    }
    return ac[0][a];
}
void tarjan(int p){
    dfn[p]=low[p]=++dft;
    s.push(p); ins[p]=1;
    for (auto i:ng[p]){
        if (!dfn[i]){
            tarjan(i);
            low[p]=min(low[p],low[i]);
        }
        else if (ins[i]&&dfn[i]<dfn[p])
            low[p]=min(low[p],dfn[i]);
    }
    if (low[p]==dfn[p]){
        nscc++;
        for (int x=0;x!=p;s.pop()){
            x=s.top(); ins[x]=0;
            scc[nscc].push_back(x);
        }
    }
}
int find(int i,bool flag){
    if (vis[i][flag]) return fa[lca[i]];
    vis[i][flag]=1;
    int p=0;
    if (flag==0) p=pos[i].x;
    else p=pos[i].y;
    while (p!=0&&dep[p]>=dep[lca[i]]){
        if (st[p]){
            ng[st[p]].push_back(i);
            p=find(st[p],flag);
        }
        else p=fa[p];
    }
    if (flag==0) p=pos[i].x;
    else p=pos[i].y;
    while (p!=0&&dep[p]>=dep[lca[i]]){
        if (ed[p]){
            ng[i].push_back(ed[p]);
            p=find(ed[p],flag);
        }
        else p=fa[p];
    }
    return fa[lca[i]];
}
void reset(){
    while (!s.empty()) s.pop();
    dft=0; nscc=0; t=0;
    for (int i=0;i<=n+5;i++){
        in[i]=0; out[i]=0; dfn[i]=0;
        low[i]=0; ins[i]=0; lca[i]=0;
        dep[i]=0; fa[i]=0; st[i]=0;
        ed[i]=0; vis[i][0]=0; vis[i][1]=0;
        g[i].clear(); ng[i].clear(); scc[i].clear();
        for (int j=0;j<=23;j++)
            ac[j][i]=0;
    }
}
signed main(){
    fast
    int q; cin>>q;
    while (q--){
        reset();
        cin>>n;
        for (int i=1;i<n;i++){
            int a,b; cin>>a>>b;
            g[a].push_back(b);
            g[b].push_back(a);
        }
        cin>>m;
        for (int i=1;i<=m;i++){
            cin>>pos[i].x>>pos[i].y;
            st[pos[i].x]=i;
            ed[pos[i].y]=i;
        }
        dfs(1,0);
        build(); in[0]=0; out[0]=1e18;
        for (int i=1;i<=m;i++)
            lca[i]=LCA(pos[i].x,pos[i].y);
        for (int i=1;i<=m;i++){
            find(i,0);
            find(i,1);
        }
        /*
        for (int i=1;i<=m;i++){
            cout<<i<<" -> ";
            for (auto j:ng[i])
                cout<<j<<" ";
            cout<<'\n';
        }
        */
        for (int i=1;i<=m;i++){
            if (!dfn[i]) tarjan(i);
        }
        if (nscc==m) cout<<"Yes\n";
        else cout<<"No\n";
    }
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8928 KB Output is correct
2 Correct 4 ms 8916 KB Output is correct
3 Correct 4 ms 8932 KB Output is correct
4 Incorrect 13 ms 9328 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8916 KB Output is correct
2 Correct 4 ms 8916 KB Output is correct
3 Incorrect 7 ms 9116 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8916 KB Output is correct
2 Correct 4 ms 8916 KB Output is correct
3 Incorrect 7 ms 9116 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8916 KB Output is correct
2 Correct 4 ms 8916 KB Output is correct
3 Incorrect 7 ms 9116 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8916 KB Output is correct
2 Correct 4 ms 8916 KB Output is correct
3 Incorrect 7 ms 9116 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8916 KB Output is correct
2 Correct 4 ms 8924 KB Output is correct
3 Correct 4 ms 8948 KB Output is correct
4 Correct 5 ms 8916 KB Output is correct
5 Incorrect 11 ms 9044 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8928 KB Output is correct
2 Correct 4 ms 8916 KB Output is correct
3 Correct 4 ms 8932 KB Output is correct
4 Incorrect 13 ms 9328 KB Output isn't correct
5 Halted 0 ms 0 KB -