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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#417929#8720. BFS 序 0OOBMABTRAMS#WA 326ms59044kbC++232.1kb2024-05-23 02:42:072024-05-23 02:42:09

Judging History

你现在查看的是最新测评结果

  • [2024-05-23 02:42:09]
  • 评测
  • 测评结果:WA
  • 用时:326ms
  • 内存:59044kb
  • [2024-05-23 02:42:07]
  • 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;
vector<pair<int,int>>mp_[N];
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];

int vis[N],dis[N];
void wk(){
    int x,sz;
    cin>>x;
    vector<int>v(x),v1,v2;
    int k=0;
    for(auto&p:v)cin>>p,id[p]=++k;
    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]){
                mp_[s[t]].emplace_back(dep[v[i]]-dep[s[t]],v[i]);
                break;
            }
            t--;
        }
        s[++t]=v[i];
    }
    priority_queue<tuple<int,int,int>>pq;
    for(auto x:v)vis[x]=0,dis[x]=1e9;
    dis[v[0]]=0;
    pq.push({0,-id[v[0]],v[0]});
    while(!pq.empty()){
        auto[len,I,x]=pq.top();
        pq.pop();
        if(vis[x])continue;
        vis[x]=1;
        if(id[x])v2.push_back(x);
        for(auto[l,i]:mp_[x])if(l+dis[x]<dis[i])dis[i]=l+dis[x],pq.push({-dis[i],-id[i],i});
    }
    int flg=1;
    for(int i=0;i<v1.size();i++)flg&=v1[i]==v2[i];
    for(auto&p:v)mp_[p].resize(0),id[p]=0;

    cout<<(flg?"Yes":"No")<<'\n';
}
int main()
{
    int n;cin>>n;
    for(int i=2;i<=n;i++)
    {
        int x;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: 0ms
memory: 9960kb

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: 326ms
memory: 59044kb

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:

No
Yes
Yes
Yes
No
No
No
No
No
No
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
No
No
No
Yes
No
No
Yes
No
No
No
No
Yes
Yes
Yes
No
No
Yes
No
No
No
No
No
No
No
Yes
No
Yes
No
Yes
No
No
No
No
Yes
Yes
Yes
No
No
Yes
No
No
No
No
No
Yes
Yes
No
No
No
No
No
Yes
Yes
No
Yes
No
No
No
Yes
No
No
Yes
No
No
Yes
Yes
Yes
Yes
No
No
...

result:

wrong answer expected NO, found YES [87th token]