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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#417931#8720. BFS 序 0OOBMABTRAMS#WA 319ms252176kbC++232.1kb2024-05-23 03:13:502024-05-23 03:13:51

Judging History

你现在查看的是最新测评结果

  • [2024-05-23 03:13:51]
  • 评测
  • 测评结果:WA
  • 用时:319ms
  • 内存:252176kb
  • [2024-05-23 03:13:50]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
const int N=300013;
vector<int>mp[N];
int dfn[N],dep[N],mnd[19][N],tot;
int s[N],t;
void dfs(int x,int fa){
    dep[x]=dep[fa]+1,mnd[0][dfn[x]=++tot]=fa;
    for(auto i:mp[x])if(i^fa)dfs(i,x);
}
int get(int x,int y){return dep[x]<dep[y]?x:y;}
int lca(int x,int y){
    if(x==y)return x;
    x=dfn[x],y=dfn[y];
    if(x>y)swap(x,y);
    int i=__lg(y-x++);
    return get(mnd[i][x],mnd[i][y-(1<<i)+1]);
}
void get_lca(int n){
    tot=0,dfs(1,0);
    for(int i=1;i<=18;i++)for(int j=1;j+(1<<i)-1<=n;j++)
            mnd[i][j]=get(mnd[i-1][j],mnd[i-1][j+(1<<(i-1))]);
}
int id[N],tp[N],occ[N];
queue<int>q[N];
void wk(){
    int x,sz;
    cin>>x;
    vector<int>v(x),v1;
    for(auto&p:v)cin>>p,id[p]=1;
    for(int i=0;i+1<x;i++){
        if(dep[v[i]]>dep[v[i+1]]){
            cout<<"No\n";
            return;
        }
    }
    v1=v;
    sort(v.begin(),v.end(),[&](int x,int y){return dfn[x]<dfn[y];});
    for(int i=1;i<x;i++)v.push_back(lca(v[i],v[i-1]));
    sort(v.begin(),v.end(),[&](int x,int y){return dfn[x]<dfn[y];});
    v.resize(unique(v.begin(),v.end())-v.begin());
    sz=v.size();
    s[t=1]=v[0];
    for(int i=1;i<sz;i++){
        while(t){
            if(lca(s[t],v[i])==s[t]){
                if(id[s[t]])tp[v[i]]=s[t];else tp[v[i]]=tp[s[t]];break;
            }
            t--;
        }
        s[++t]=v[i];
    }
    int flg=1;
    for(int i=x-1;~i;i--){
        int o=v1[i];
        if(occ[o]){
            if(q[dep[o]].empty()||q[dep[o]].front()!=o)flg=0;
            else q[dep[o]].pop();
        }
        if(tp[o])if(q[dep[tp[o]]].empty()||q[dep[tp[o]]].back()!=tp[o])q[dep[tp[o]]].push(tp[o]),occ[tp[o]]=1;
    }
    for(int i=x-1;~i;i--){
        occ[v1[i]]=0;
        while(!q[dep[v1[i]]].empty())flg=0,q[dep[v1[i]]].pop();
    }
    if(flg)cout<<"Yes\n";
    else cout<<"No\n";
    cout<<endl;
}
int main()
{
    int n;cin>>n;
    for(int i=2,x;i<=n;i++)cin>>x, mp[x].push_back(i), mp[i].push_back(x);
    get_lca(n);
    //dfs(1,0);
    int q;
    cin>>q;
    for(int i=1;i<=q;i++) wk();
}

Details

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Test #1:

score: 100
Accepted
time: 47ms
memory: 215908kb

input:

6
1 1 3 2 4
10
4 3 6 2 5
1 4
3 2 4 5
5 2 5 4 6 3
3 1 4 2
3 5 6 3
5 4 5 2 6 1
4 4 3 2 5
4 4 6 2 3
3 3 2 6

output:

No
Yes

Yes

No
No
No
No
No
No
Yes


result:

ok 10 token(s): yes count is 3, no count is 7

Test #2:

score: -100
Wrong Answer
time: 319ms
memory: 252176kb

input:

300000
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1...

output:

Yes

Yes

No

No

Yes

Yes

Yes

Yes

Yes

Yes

No

No

Yes

No

Yes

No

Yes

No

Yes

Yes

Yes

Yes

No

Yes

Yes

No

No

Yes

Yes

Yes

No

Yes

No

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

No

No

Yes

Yes

Yes

No

Yes

No

Yes

Yes

No

No

No

Yes

Yes

No

Yes

Yes

Yes

Yes

Yes

No

No...

result:

wrong answer expected NO, found YES [1st token]