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ID	题目	提交者	结果	用时	内存	语言	文件大小	提交时间	测评时间
#654822	#8551. DFS Order 5	include_BM	WA	10ms	13652kb	C++14	2.0kb	2024-10-18 22:24:34	2024-10-18 22:24:34

Judging History

你现在查看的是最新测评结果

[2024-10-18 22:24:34]
评测

测评结果：WA
用时：10ms
内存：13652kb

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[2024-10-18 22:24:34]
提交

answer

//People who believe in miracles are as amazing as miracles themselves.
#include<bits/stdc++.h>
#define ll long long
using namespace std;
inline ll read(){
    ll x=0,f=1;char ch=getchar();
    while(ch<'0'||ch>'9'){if(ch=='-') f=-f;ch=getchar();}
    while(ch>='0'&&ch<='9')x=(x<<3)+(x<<1)+(ch^48),ch=getchar();
    return x*f;
}

const int N=2e5+10,LOG=20;
int n,m,vc[N],num,siz[N],fa[N][LOG],dep[N],ans,vis[N]; vector<int> G[N];

void dfs(int x,int fa){
    siz[x]=1,::fa[x][0]=fa,dep[x]=dep[fa]+1;
    for(int j=1;j<LOG;++j) ::fa[x][j]=::fa[::fa[x][j-1]][j-1];
    for(auto y:G[x]) if(y!=fa) dfs(y,x),siz[x]+=siz[y];
}

inline bool check_x_is_ys_nfa(int x,int y){
    for(int j=LOG-1;~j;--j)
        if(dep[fa[y][j]]>=dep[x]) y=fa[y][j];
    return x==y;
}
inline bool check_jump(int x,int y){
    if(check_x_is_ys_nfa(x,y)) return 0;
    return check_x_is_ys_nfa(fa[x][0],y);
}

bool check(int x,int l,int r){
    if(vc[l]!=x) return 0;
    for(int i=l+1;i<=r;){
        if(fa[vc[i]][0]!=x) return 0;
        if(i+siz[vc[i]]-1>=r) return check(vc[i],i,r);
        if(!check(vc[i],i,i+siz[vc[i]]-1)) return 0;
        i+=siz[vc[i]];
    }
    return 1;
}

inline void solve(){
    n=read(),m=read();
    for(int u,v,i=1;i<n;++i){
        u=read(),v=read();
        G[u].emplace_back(v),G[v].emplace_back(u);
    }
    dfs(1,0);
    for(;m;--m){
        num=read(),ans=1;
        for(int i=1;i<=num;++i) vc[i]=read(),ans&=(!vis[vc[i]]++);
        for(int i=1;;){
            if(i+siz[vc[i]]-1>=num){ans&=check(vc[i],i,num);break;}
            ans&=check(vc[i],i,i+siz[vc[i]]-1);
            if(!ans||!check_jump(vc[i+siz[vc[i]]],vc[i])){ans=0;break;}
            i+=siz[vc[i]];
        }
        if(ans) puts("Yes"); else puts("No");
        for(int i=1;i<=num;++i) vis[vc[i]]=0;
    }
}

signed main(){
#ifndef ONLINE_JUDGE
    freopen("../1.in","r",stdin);
    freopen("../1.out","w",stdout);
#endif
    solve();
    return 0;
}

源文件, 语言: C++14

详细

Test #1:

score: 100

Accepted

time: 0ms

memory: 12556kb

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: 10ms

memory: 13652kb

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
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
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
...

result:

wrong answer 89th words differ - expected: 'No', found: 'Yes'