Submission #553985

#	Time	Username	Problem	Language	Result	Execution time	Memory
553985		proma	Jail (JOI22_jail)	C++17	0 / 100	5089 ms	420 KiB

jail

#include <bits/stdc++.h>

using namespace std;

const int N = 300;

int n, m, p[N];
vector <int> g[N];
vector <pair<int, int>> v;

void dfs(int v) {
    for (auto i: g[v]) {
        if (i != p[v]) {
            p[i] = v;
            dfs(i);
        }
    }
}

void solve() {
    cin >> n;
    for (int i = 1; i <= n; i ++) {
        g[i].clear();
    }
    for (int i = 1; i < n; i ++) {
        int a, b;
        cin >> a >> b;
        g[a].push_back(b);
        g[b].push_back(a);
    }
    cin >> m;
    v.clear();
    v.resize(m);
    for (int i = 0; i < m; i ++) {
        cin >> v[i].first >> v[i].second;
    }
    do {
        int flag = 1;
        for (int i = 0; i < m; i ++) {
            memset(p, 0, sizeof(p));
            dfs(v[i].first);
            for (int j = v[i].second; j != v[i].first and j; j = p[j]) {
                for (int k = 0; k < i; k ++) {
                    if (j == v[k].second) flag = 0;
                }
                for (int k = i + 1; k < m; k ++) {
                    if (j == v[k].first) flag = 0;
                }
            }
        }
        if (flag) {
            cout << "Yes\n";
            return;
        }
    } while(next_permutation(v.begin(), v.end()));
    cout << "No\n";
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int q;
    cin >> q;
    while (q --) {
        solve();
    }

    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23