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ID	Problem	Submitter	Result	Time	Memory	Language	File size	Submit time	Judge time
#537125	#8551. DFS Order 5	obiwan114	WA	26ms	5652kb	C++20	1.9kb	2024-08-29 21:18:38	2024-08-29 21:18:38

Judging History

你现在查看的是最新测评结果

[2024-08-29 21:18:38]
评测

测评结果：WA
用时：26ms
内存：5652kb

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[2024-08-29 21:18:38]
提交

answer

#include <bits/stdc++.h>

using namespace std;
//#define int long long
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
const int MAXX = 1e5 + 5;
vector<int>g[MAXX];
int fa[MAXX],dep[MAXX],siz[MAXX],son[MAXX],top[MAXX],dfn[MAXX],rnk[MAXX];
void dfs1(int u){
    son[u] = -1;
    siz[u] = 1;
    for(int v : g[u]){
        if(dep[v])continue;
        dep[v] = dep[u] + 1;
        fa[v] = u;
        dfs1(v);
        siz[u] += siz[v];
        if(son[u] == -1 || siz[v] > siz[son[u]]){
            son[u] = v;
        }
    }
}
//int cnt = 0;
//void dfs2(int u,int t){
//    cnt++;
//    dfn[u] = cnt;
//    rnk[cnt] = u;
//    top[u] = t;
//    if(son[u] == -1)return;
//    dfs2(son[u],t);
//    for(int v : g[u]){
//        if(v == fa[u])continue;
//        if(v == son[u])continue;
//        dfs2(v,v);
//    }
//}
int n,q;
int a[MAXX];
void solve() {
    int k;
    cin >> k;
    for(int i = 1;i <= k;i++){
        cin >> a[i];
    }
    vector<int>dp(n + 2);
    dp[a[1]]++;
    for(int i = 2;i <= k;i++){
        int x = a[i - 1];
        int y = a[i];
        if(x != fa[y] && son[x] != -1){
            cout << "No\n";
            return;
        }
        while(x != fa[y] && x != 1){
//            if(dp[x] < siz[x]){
//                cout << "No\n";
//                return;
//            }
            dp[fa[x]] += dp[x];
            x = fa[x];
        }
        if(x != fa[y]){
            cout << "No\n";
            return;
        }
        if(dp[a[i]]){
            cout << "No\n";
            return;
        }
    }
    cout << "Yes\n";
}

signed main() {
    ios::sync_with_stdio(false), cin.tie(0);
    cin >> n >> q;
    for(int i = 1;i < n;i++){
        int u,v;
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
    }
    dep[1] = 1;
    dfs1(1);
//    dfs2(1,1);
    while (q--) {
        solve();
    }
    return 0;
}

Source code, Language: C++20

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100

Accepted

time: 1ms

memory: 5652kb

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: 26ms

memory: 5616kb

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
No
No
No
No
No
No
No
No
N...

result:

wrong answer 114th words differ - expected: 'No', found: 'Yes'