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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#672757#8551. DFS Order 5libantian#WA 67ms3608kbC++233.7kb2024-10-24 18:46:012024-10-24 18:46:01

Judging History

你现在查看的是最新测评结果

  • [2024-10-24 18:46:01]
  • 评测
  • 测评结果:WA
  • 用时:67ms
  • 内存:3608kb
  • [2024-10-24 18:46:01]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define INF 0x3f3f3f3f3f3f3f3f
#define pii pair<int,int>
#define fi first
#define se second
#define all(_a) _a.begin(), _a.end()
struct HLD {
    int n, idx;
    vector<vector<int>> ver;
    vector<int> siz, dep,cnt;
    vector<int> top, son, parent;

    HLD(int n) {
        this->n = n;
        ver.resize(n + 1);
        siz.resize(n + 1);
        dep.resize(n + 1);
        cnt.resize(n + 1);

        top.resize(n + 1);
        son.resize(n + 1);
        parent.resize(n + 1);
    }
    void add(int x, int y) { // 建立双向边
        ver[x].push_back(y);
        ver[y].push_back(x);
    }
    void dfs1(int x) {
        siz[x] = 1;
        dep[x] = dep[parent[x]] + 1;
        for (auto y : ver[x]) {
            if (y == parent[x]) continue;
            cnt[x]++;
            parent[y] = x;
            dfs1(y);
            siz[x] += siz[y];
            if (siz[y] > siz[son[x]]) {
                son[x] = y;
            }
        }
    }
    void dfs2(int x, int up) {
        top[x] = up;
        if (son[x]) dfs2(son[x], up);
        for (auto y : ver[x]) {
            if (y == parent[x] || y == son[x]) continue;
            dfs2(y, y);
        }
    }
    int lca(int x, int y) {
        while (top[x] != top[y]) {
            if (dep[top[x]] > dep[top[y]]) {
                x = parent[top[x]];
            } else {
                y = parent[top[y]];
            }
        }
        return dep[x] < dep[y] ? x : y;
    }
    int clac(int x, int y) { // 查询两点间距离
        return dep[x] + dep[y] - 2 * dep[lca(x, y)];
    }
    void work(int root = 1) { // 在此初始化
        dfs1(root);
        dfs2(root, root);
    }
};
void solve(){
    int n,q;
    cin>>n>>q;
    HLD hld(n);
    for(int i=1;i<n;i++){
        int x,y;
        cin>>x>>y;
        hld.add(x,y);
    }
    hld.work();
    while(q--){
        int k;
        cin>>k;
        vector<int>a(k+1);
        set<int> s;
        for(int i=1;i<=k;i++){
            cin>>a[i];
            s.insert(a[i]);
        }
        if(s.size()!=k){
            cout<<"No"<<endl;
            continue;
        }
        // for(int i=1;i<=k;i++)cout<<a[i]<<" ";
        // cout<<endl;
        if(k==1){
            cout<<"Yes"<<endl;
            continue;
        }
        int p=a[1];
        for(int i=2;i<=k;i++)p=hld.lca(p,a[i]);
        map<int,int>mp;
        //cout<<p<<endl;
        if(p==a[1]){
            for(int i=2;i<=k;i++){
                if(hld.parent[a[i]]==a[1])mp[hld.dep[p]]++;
            }
        }else{
            for(int i=2;i<=k;i++){
                if(hld.parent[a[i]]==a[1])mp[hld.dep[a[1]]]++;
                if(hld.parent[a[i]]==p)mp[hld.dep[p]]++;
            }
           
        }
        //for(auto v:mp)cout<<v.fi<<" "<<v.se<<endl;
        //  for(int i=1;i<=k;i++)cout<<a[i]<<" ";
        // cout<<endl;
        bool is=true;
        for(int i=2;i<=k;i++){
            // cout<<i<<" "<<a[k]<<endl;
            int d=hld.dep[hld.parent[a[i]]];
            //cout<<d<<endl;
            if(mp.empty()||d!=(*mp.rbegin()).fi){
                //cout<<i<<endl;
                is=false;
                break;
            }else{
                mp[d]--;
                if(mp[d]==0)mp.erase(d);
            }
            if(hld.cnt[a[i]])mp[hld.dep[a[i]]]+=hld.cnt[a[i]];
        }
        if(is)cout<<"Yes"<<endl;
        else cout<<"No"<<endl;
    }

}
signed main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr), cout.tie(nullptr);
    cout << setiosflags(ios::fixed) << setprecision(15);
    int T;
    T=1;
    //cin>>T;
    while(T--)solve();
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3608kb

input:

6 7
1 2
1 3
2 4
3 5
2 6
2 4 1
2 4 2
2 4 3
2 4 4
2 4 5
2 4 6
6 1 2 6 4 3 5

output:

No
No
Yes
No
No
Yes
Yes

result:

ok 7 tokens

Test #2:

score: -100
Wrong Answer
time: 67ms
memory: 3500kb

input:

10 100000
7 2
1 7
7 10
8 6
8 7
1 3
4 5
9 5
5 8
8 8 9 7 2 8 1 6 1
4 8 3 5 2
6 7 10 3 9 9 1
1 1
8 10 3 2 9 3 8 7 3
7 5 6 2 8 5 9 1
6 3 4 6 2 1 3
5 8 9 2 4 9
1 3
2 1 5
5 8 5 1 7 9
10 5 2 9 2 6 4 10 6 3 8
3 4 5 8
2 8 4
9 4 10 1 2 4 3 3 6 3
1 3
6 1 1 6 8 3 1
3 7 3 2
3 9 1 5
4 3 7 8 10
9 4 2 3 10 2 5 4 3 ...

output:

No
No
No
Yes
No
No
No
No
Yes
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
Yes
No
No
No
No
No
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Yes
No
No
Yes
Yes
No
No
No
No
Yes
No
No
No
No
No
No
No
No
Yes
No
No
No
No
No
No
No
N...

result:

wrong answer 46th words differ - expected: 'Yes', found: 'No'