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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
#808175	#8551. DFS Order 5	ucup-team2179^#	WA	53ms	7896kb	C++23	2.5kb	2024-12-10 17:36:59	2024-12-10 17:37:17

Judging History

你现在查看的是最新测评结果

[2024-12-10 17:37:17]
评测

测评结果：WA
用时：53ms
内存：7896kb

查看

[2024-12-10 17:36:59]
提交

answer

#include<bits/stdc++.h>
#define int long long
#define pb push_back
#define pii pair<int, int>
using namespace std;
const int maxn=300050;
int par[maxn][22];
int dep[maxn];
int siz[maxn];
int C=20;
vector<int>  a[maxn];
void dfs(int u,int pre)  //根节点深度为1
{
    dep[u]=dep[pre]+1;
    par[u][0]=pre;
    siz[u]++;
    for(int i=1;i<C;i++)
    {
        par[u][i]=par[par[u][i-1]][i-1];
    }
    for(auto p:a[u])
    {
        if(p==pre)
            continue;
        siz[u]+=siz[p];
        dfs(p,u);
    }
}
int lca(int x,int y)
{
    if(dep[y]>dep[x])swap(x,y);
    
    for(int i=C-1;i>=0;i--)
    {
        if(dep[par[x][i]]>=dep[y])
        x=par[x][i];
    }
    if(x==y)return y;
    for(int i=C-1;i>=0;i--)
    if(par[x][i]!=par[y][i])
    {
        x=par[x][i];
        y=par[y][i];
    }
    return par[x][0];
}


int LCA(int u, int v) {
    return lca(u, v);
}
struct stable {
    vector<vector<int>> mylist;
    int n;
    int (*op) (int a, int b);
    stable(vector<int>&a, int(*f)(int, int)) {
        op = f;
        n = a.size() - 1;
        mylist = vector<vector<int>> (n + 1, vector<int>(__lg(n) + 1));
        for (int i = 1; i <= n; i++) mylist[i][0] = a[i];
        for (int j = 1; j <= __lg(n); j++)
            for (int i = 1; i <= n - (1 << j) + 1; i++)
                mylist[i][j] = op(mylist[i][j - 1], mylist[i + (1 << j - 1)][j - 1]);
    }
    int q(int l, int r) {
        assert(l >= 1 && r <= n && l <= r);
        int len = __lg(r - l + 1);
        return op(mylist[l][len], mylist[r - (1 << len) + 1][len]);
    }
};
void solve() {
    int n, q; cin >> n >> q;
    for (int i = 1; i < n; i++) {
        int u, v; cin >> u >> v;
        a[u].push_back(v);
        a[v].push_back(u);
    }
    dfs(1, 0);
    while (q--) {
        int k; cin >> k;
        set<int> s;
        vector<int> arr(k + 1);
        for (int i = 1; i <= k; i++) cin >> arr[i], s.insert(arr[i]);
        if (s.size() != k) {
            cout << "No\n";
            continue;
        }
        stable st(arr, LCA);
        int flag = 1;
        for (int i = 1; i < k && flag; i++)
            flag &= LCA(arr[i], arr[i + 1]) == par[arr[i + 1]][0];
        for (int i = 1; i <= k && flag; i++) {
            flag &= arr[i] == st.q(i, min(k, i + siz[arr[i]] - 1));
        }

        if (flag) cout << "Yes\n";
        else cout << "No\n";
    }
}
signed main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    int t = 1;
    // cin >> t;
    while (t--) solve();
    return 0;
}

源文件, 语言: C++23

詳細信息

Test #1:

score: 100

Accepted

time: 0ms

memory: 7896kb

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: 53ms

memory: 7716kb

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
Yes
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
N...

result:

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