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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#417442#8720. BFS 序 0grass8cow#WA 125ms60960kbC++171.8kb2024-05-22 18:52:272024-05-22 18:52:28

Judging History

你现在查看的是最新测评结果

  • [2024-05-22 18:52:28]
  • 评测
  • 测评结果:WA
  • 用时:125ms
  • 内存:60960kb
  • [2024-05-22 18:52:27]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
vector<int>g[501000];
int f[500100][20],d[500100],dfn[501000],sz[501000];
#define pb push_back
void dfs(int x){
    sz[x]=1,dfn[x]=++dfn[0];
    for(int v:g[x]){
        f[v][0]=x,d[v]=d[x]+1;
        for(int i=1;i<20;i++)f[v][i]=f[f[v][i-1]][i-1];
        dfs(v),sz[x]+=sz[v];
    }
}
int lca(int u,int v){
    if(d[u]<d[v])swap(u,v);int a=d[u]-d[v];
    for(int i=19;i>=0;i--)if((a>>i)&1)u=f[u][i];if(u==v)return u;
    for(int i=19;i>=0;i--)if(f[u][i]!=f[v][i])u=f[u][i],v=f[v][i];
    return f[u][0];
}
int zj(int x,int t){
    if(dfn[x]<=dfn[t]&&dfn[t]<dfn[x]+sz[x]){
        for(int i=19;i>=0;i--)
        if(f[t][i]&&d[f[t][i]]>d[x])t=f[t][i];
        return t;
    }
    return f[x][0];
}
#define pb push_back
int n,tp[501000],S,a[500100],rk[501000],b[501000],ru[501000];
vector<int>cj[501000];
int main(){
    scanf("%d",&n);
    for(int i=2,f;i<=n;i++)scanf("%d",&f),g[f].pb(i);
    dfs(1);
    int q;scanf("%d",&q);
    while(q--){
        scanf("%d",&S);
        for(int i=1;i<=S;i++)scanf("%d",&a[i]),b[i]=a[i];
        sort(b+1,b+S+1);
        bool fl=1;
        for(int i=1;i<S;i++)fl&=(d[a[i]]<=d[a[i+1]]),fl&=(b[i]!=b[i+1]);
        if(!fl){puts("No");continue;}
        int e=0;
        for(int i=1;i<S;i++)if(d[a[i]]==d[a[i+1]]){
            int lc=lca(a[i],a[i+1]),u=zj(a[i],lc),v=zj(a[i+1],lc);
            if(tp[u]!=q)tp[u]=q,rk[u]=++e,ru[e]=0,cj[e].clear();
            if(tp[v]!=q)tp[v]=q,rk[v]=++e,ru[e]=0,cj[e].clear();
            cj[rk[u]].pb(rk[v]),ru[rk[v]]++;
        }
        queue<int>z;
        for(int i=1;i<=e;i++)if(!ru[i])z.push(i);
        int vc=0;
        while(!z.empty()){
            int u=z.front();z.pop();vc++;
            for(int v:g[u])if(!(--ru[v]))z.push(v);
        }
        puts((vc==e)?"Yes":"No");
    }
    return 0;
}

Details

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Test #1:

score: 100
Accepted
time: 3ms
memory: 28264kb

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: 125ms
memory: 60960kb

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

result:

wrong answer expected YES, found NO [2nd token]