QOJ.ac

QOJ

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
#661371	#8551. DFS Order 5	LeNcyer^#	WA	35ms	3756kb	C++20	1.7kb	2024-10-20 15:57:14	2024-10-20 15:57:16

Judging History

你现在查看的是最新测评结果

[2024-10-20 15:57:16]
评测

测评结果：WA
用时：35ms
内存：3756kb

查看

[2024-10-20 15:57:14]
提交

answer

#include <bits/stdc++.h>

using namespace std;

#define endl '\n'
using ll = long long;

const int N = 1e5 + 10;
const int sz = 20;

int n, q;
vector<int> t[N];
int dep[N], f[N][sz];

void dfs (int x, int fa) {
    f[x][0] = fa;
    dep[x] = dep[fa] + 1;
    for (int i = 1; i < sz; i ++) {
        f[x][i] = f[f[x][i - 1]][i - 1];
    }
    for (auto y: t[x]) {
        if (y == fa) continue;
        dfs(y, x);
    }
}

int get_lca (int x, int y) {
    for (int i = sz - 1; i >= 0; i --) {
        if (dep[f[x][i]] >= dep[y]) x = f[x][i];
        if (dep[f[y][i]] >= dep[x]) y = f[y][i];
    }
    if (x == y) return x;
    for (int i = sz - 1; i >= 0; i --) {
        if (f[x][i] != f[y][i]) {
            x = f[x][i];
            y = f[y][i];
        }
    }
    return f[x][0];
}

void init () {
    cin >> n >> q;
    for (int i = 1; i < n; i ++) {
        int u, v;
        cin >> u >> v;
        t[u].push_back(v);
        t[v].push_back(u);
    }
}

int a[N];

void solve() {
    init();
    dfs(1, 0);
//    cout << "debug\n";
    while (q --) {
        int k;
        cin >> k;
        for (int i = 1; i <= k; i ++) {
            cin >> a[i];
        }
//        cout << q << ' ' << k << endl;
        bool ok = 1;
        for (int i = 2; i <= k; i ++) {
            int fa = f[a[i]][0];
            int lca = get_lca(a[i - 1], a[i]);
            if (fa != lca) {
                ok = 0;
                break;
            }
        }
        if (ok) cout << "Yes\n";
        else cout << "No\n";
    }
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int _ = 1;
//    cin >> _;
    while (_--)
        solve();
    return 0;
}

源文件, 语言: C++20

详细

Test #1:

score: 100

Accepted

time: 1ms

memory: 3756kb

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: 35ms

memory: 3716kb

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'