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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
#469088	#8720. BFS 序 0	JEdward	WA	190ms	91360kb	C++17	2.2kb	2024-07-09 13:31:44	2024-07-09 13:31:44

Judging History

你现在查看的是最新测评结果

[2024-07-09 13:31:44]
评测

测评结果：WA
用时：190ms
内存：91360kb

查看

[2024-07-09 13:31:44]
提交

answer

#include <bits/stdc++.h>
#define IOS ios::sync_with_stdio(0), cin.tie(0)
#define int long long
#define endl '\n'
#define lowbit(x) (x)&(-x)
#define pii pair<int,int>
#define all(s) s.begin(), s.end()
#define ls(x) (x<<1)
#define rs(x) (x<<1|1) 
#define here system("pause")
using namespace std;

const int N = 3e5+5;
const int mod = 1e9+7;
const int INF = 1e15+7;
const double eps = 1e-6;
inline int pow(int a, int b, int p){ int res = 1%p; while(b){ if(b&1) res=res*a%p; a=a*a%p, b>>=1;} return res;}
inline int inv(int a, int p){ return pow(a,p-2,p)%p;}

int n, q;
vector<int> g[N], pd[N];
int f[N][20], dep[N], ask[N<<1], indeg[N];

inline void sol(){
	cin >> n;
	for(int i=2;i<=n;i++){
		cin >> f[i][0];
		g[f[i][0]].push_back(i);
		g[i].push_back(f[i][0]);
	}
	for(int i=1;i<=n;i++){
		dep[i]=dep[f[i][0]]+1;
	}
	for(int i=1;i<19;i++){
		for(int j=1;j<=n;j++){
			f[i][j]=f[i-1][f[i-1][j]];
		}
	}
		
	cin >> q;
	while(q--){
		int num;
		cin >> num;
		bool flag = 1;
		
		for(int i=1;i<=num;i++){
			cin >> ask[i];
			if(i!=1 && ask[i-1]==ask[i]) flag = 0;
			if(i!=1 && dep[ask[i]] < dep[ask[i-1]]) flag = 0;
		}
		
		if(!flag){
			cout << "No\n";
			continue;
		}
		
		set<int> st;
		for(int i=2;i<=num;i++){
			if(dep[ask[i-1]]==dep[ask[i]]){
				int a = ask[i-1], b = ask[i];
				for(int j=19;j>=0;j--){
					if(f[j][a] != f[j][b]) a = f[j][a], b = f[j][b];
				}
				
				st.insert(a), st.insert(b);
				pd[a].clear(), pd[b].clear();
				indeg[a] = indeg[b] = 0;
			}
		}
		
		for(int i=2;i<=num;i++){
			if(dep[ask[i-1]]==dep[ask[i]]){
				int a = ask[i-1], b = ask[i];
				for(int j=19;j>=0;j--){
					if(f[j][a] != f[j][b]) a = f[j][a], b = f[j][b];
				}
				
				pd[a].push_back(b);
				++indeg[b];
			}
		}
		
		queue<int> q;
		for(int k:st){
			if(!indeg[k]) q.push(k);
		}
		
		while(q.size()){
			int now = q.front();
			q.pop();
			for(int k:pd[now]){
				--indeg[k];
				if(!indeg[k]) q.push(k);
			}
		}
		
		for(int k:st){
			if(indeg[k]) flag = 0;
		}
		if(!flag) cout << "No\n";
		else cout << "Yes\n";
	}
}

signed main(){
	IOS;
	int tc = 1;
	while(tc--){
		sol();
	}
	return 0;
}

源文件, 语言: C++17

詳細信息

Test #1:

score: 100

Accepted

time: 0ms

memory: 22400kb

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: 190ms

memory: 91360kb

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]