oj.uz

Submission #646018

# Submission time Handle Problem Language Result Execution time Memory
646018 2022-09-28T13:51:50 Z victor_gao Jail (JOI22_jail) C++17
0 / 100
 15 ms 8912 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;
bool ins[N];
stack<int>s;
pii pos[N];
vector<int>g[N],ng[N],scc[N];
void dfs(int p,int lp){
    fa[p]=lp;
    dep[p]=dep[lp]+1;
    for (auto i:g[p]){
        if (i!=lp) dfs(i,p);
    }
}
int LCA(int a,int b){
    while (a!=b){
        if (dep[a]>dep[b]) a=fa[a];
        else b=fa[b];
    }
    return a;
}
int find_first_start(int x,int lca){
    if (dep[x]<dep[lca]) return 0;
    while (x!=lca&&!st[x]) x=fa[x];
    if (st[x]) return st[x];
    else return 0;
}
int find_first_end(int x,int lca){
    if (dep[x]<dep[lca]) return 0;
    while (x!=lca&&!ed[x]) x=fa[x];
    if (ed[x]) return ed[x];
    else return 0;
}
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);
        }
    }
}
void reset(){
    nscc=0; dft=0;
    while (!s.empty()) s.pop();
    for (int i=0;i<=m+5;i++){
        fa[i]=0; dfn[i]=0; low[i]=0; st[i]=0; 
        dep[i]=0; ins[i]=0; ed[i]=0;
        ng[i].clear();
        scc[i].clear();
    }
    for (int i=0;i<=n+5;i++){
        g[i].clear();
    }
}
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);
        }
        dfs(1,0);
        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;
        }
        for (int i=1;i<=m;i++){
            int lca=LCA(pos[i].x,pos[i].y);
            int x=pos[i].x;
            while (x!=lca){
                if (ed[x]&&ed[x]!=i) ng[i].push_back(ed[x]);
                if (st[x]&&st[x]!=i) ng[st[x]].push_back(i);
                x=fa[x];
            }
            x=pos[i].y;
            while (x!=lca){
                if (ed[x]&&ed[x]!=i) ng[i].push_back(ed[x]);
                if (st[x]&&st[x]!=i) ng[st[x]].push_back(i); 
                x=fa[x];
            }
            if (st[lca]&&st[lca]!=i) ng[st[lca]].push_back(i);
            if (ed[lca]&&ed[lca]!=i) ng[i].push_back(ed[lca]);
        }
        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 4 ms 8800 KB Output is correct
2 Correct 4 ms 8788 KB Output is correct
3 Correct 5 ms 8788 KB Output is correct
4 Incorrect 15 ms 8912 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8796 KB Output is correct
2 Correct 5 ms 8800 KB Output is correct
3 Incorrect 7 ms 8844 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8796 KB Output is correct
2 Correct 5 ms 8800 KB Output is correct
3 Incorrect 7 ms 8844 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8796 KB Output is correct
2 Correct 5 ms 8800 KB Output is correct
3 Incorrect 7 ms 8844 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8796 KB Output is correct
2 Correct 5 ms 8800 KB Output is correct
3 Incorrect 7 ms 8844 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8788 KB Output is correct
2 Correct 4 ms 8788 KB Output is correct
3 Correct 5 ms 8744 KB Output is correct
4 Correct 5 ms 8788 KB Output is correct
5 Incorrect 10 ms 8852 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 8800 KB Output is correct
2 Correct 4 ms 8788 KB Output is correct
3 Correct 5 ms 8788 KB Output is correct
4 Incorrect 15 ms 8912 KB Output isn't correct
5 Halted 0 ms 0 KB -