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ID	Problem	Submitter	Result	Time	Memory	Language	File size	Submit time	Judge time
#578240	#8551. DFS Order 5	gungod^#	WA	34ms	13856kb	C++14	1.6kb	2024-09-20 17:36:00	2024-09-20 17:36:00

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你现在查看的是最新测评结果

[2024-09-20 17:36:00]
评测

测评结果：WA
用时：34ms
内存：13856kb

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[2024-09-20 17:36:00]
提交

answer

#include<bits/stdc++.h>
using namespace std;
const int N=1e5+10;
int Y,m,pos,a[N],dep[N],anc[N][21],siz[N];
set<int>son[N];
vector<int>G[N];
void Dfs(int u) {
	siz[u]=1;
	for(int i=1;i<=20;i++) anc[u][i]=anc[anc[u][i-1]][i-1];
	for(auto v:G[u]) if(!dep[v]) {
		dep[v]=dep[u]+1;
		son[u].insert(v);
		anc[v][0]=u;//cout<<u<<"     "<<v<<endl;
		Dfs(v); 
		siz[u]+=siz[v];
	}
}
int lca(int u,int v) {
	if(dep[u]>dep[v]) swap(u,v);
	for(int i=20;i>=0;i--) if(dep[anc[v][i]]>=dep[u]) v=anc[v][i];
	if(u==v) return v;
	for(int i=20;i>=0;i--) if(anc[v][i]^anc[u][i]) u=anc[u][i],v=anc[v][i];
	return anc[u][0];
}
void DFS(int u) {
	while(pos<=Y&&son[u].count(a[pos])) {
		DFS(a[pos++]);
	}
}
bool chk1(int x) {
	Y=x+siz[a[x]]-1;
	pos=x+1;
	DFS(a[x]);
	return pos>Y;
} 
bool chk2(int x) {
	for(int j=1;j<x;j++) if(lca(a[j],a[x])==a[x]) return false;
	Y=m;
	pos=x+1;
	DFS(a[x]);
	return pos>Y;
}
void main1() {
	scanf("%d",&m);
	for(int i=1;i<=m;i++) scanf("%d",&a[i]);
	for(int i=1;;) {
		if(i+siz[a[i]]-1>=m) {
        	if(!chk2(i)) puts("No");
			else puts("Yes");
        	return ;
		}
		else {
			//cout<<"flag" <<a[i]<<" "<<a[i+siz[a[i]]]<<" "<<lca(a[i],a[i+siz[a[i]]])<<" "<<anc[a[i+siz[a[i]]]][0]<<endl;
			if(!chk1(i)) return puts("No"),void();
			if(lca(a[i],a[i+siz[a[i]]])!=anc[a[i+siz[a[i]]]][0]||anc[a[i+siz[a[i]]]][0]==a[i]) return puts("No"),void();
			i+=siz[a[i]];
		}
	}
}
int main() {
	int n,q;
	scanf("%d%d",&n,&q);
	for(int i=1,u,v;i<n;i++) scanf("%d%d",&u,&v),G[u].push_back(v),G[v].push_back(u);
	dep[1]=1;
	Dfs(1);
	for(int _=1;_<=q;_++) {
		main1();
	}
}

Source code, Language: C++14

Details

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Test #1:

score: 100

Accepted

time: 3ms

memory: 13856kb

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: 34ms

memory: 13600kb

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

result:

wrong answer 20th words differ - expected: 'No', found: 'Yes'