oj.uz

답안 #709958

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
709958 2023-03-15T01:41:23 Z GrandTiger1729 Jail (JOI22_jail) C++17
5 / 100
 241 ms 33676 KB 
#include <iostream>
#include <vector>
#include <functional>
using namespace std;

int main(){
    cin.tie(0)->sync_with_stdio(0);
    int t; cin >> t;
    while (t--){
        int n; cin >> n;
        vector<vector<int>> g(n);
        for (int i = 0; i < n - 1; i++){
            int u, v; cin >> u >> v;
            u--, v--;
            g[u].push_back(v);
            g[v].push_back(u);
        }
        vector<bool> vis(n);
        vector<int> dep(n);
        vector<vector<int>> up(n, vector<int>(__lg(n) + 1));
        function<void(int)> dfs = [&](int u){
            vis[u] = 1;
            for (auto &v: g[u]){
                if (vis[v]) continue;
                up[v][0] = u;
                dep[v] = dep[u] + 1;
                dfs(v);
            }
            vis[u] = 0;
        };
        dfs(0);
        for (int j = 1; j <= __lg(n); j++){
            for (int i = 0; i < n; i++){
                up[i][j] = up[up[i][j - 1]][j - 1];
            }
        }
        auto lca = [&](int u, int v){
            if (dep[u] < dep[v]) swap(u, v);
            for (int i = __lg(n); i >= 0; i--){
                if (dep[up[u][i]] >= dep[v]){
                    u = up[u][i];
                }
            }
            if (u == v) return u;
            for (int i = __lg(n); i >= 0; i--){
                if (up[u][i] != up[v][i]){
                    u = up[u][i];
                    v = up[v][i];
                }
            }
            return up[u][0];
        };
        vector<pair<int, int>> tag(n);
        for (int i = 0; i < n; i++){
            tag[i] = make_pair(i, i);
        }
        int q; cin >> q;
        while (q--){
            int u, v; cin >> u >> v;
            u--, v--;
            int l = lca(u, v);
            if (dep[l] < dep[tag[u].first]){
                tag[u].first = l;
            }
            if (dep[l] < dep[tag[v].second]){
                tag[v].second = l;
            }
        }
        // cout << endl;
        // for (int i = 0; i < n; i++){
        //     cout << tag[i].first << ' ' << tag[i].second << endl;
        // }
        // cout << endl;
        bool flag = 0;
        function<void(int)> solve = [&](int u){
            vis[u] = 1;
            pair<int, int> res{u, u};
            for (auto &v: g[u]){
                if (vis[v]) continue;
                solve(v);
                if (dep[tag[v].first] <= dep[u] && dep[tag[v].second] <= dep[u])
                    flag = 1;
                if ((tag[u].first != u && dep[tag[v].first] < dep[tag[u].first]) \
                         || (tag[u].second != u && dep[tag[v].second] < dep[tag[u].second]))
                    flag = 1;
                if (dep[tag[v].first] <= dep[res.first])
                    res.first = tag[v].first;
                if (dep[tag[v].second] <= dep[res.second])
                    res.second = tag[v].second;
            }
            if (dep[res.first] <= dep[tag[u].first])
                tag[u].first = res.first;
            if (dep[res.second] <= dep[tag[u].second])
                tag[u].second = res.second;
            vis[u] = 0;
        };
        solve(0);
        cout << (!flag? "Yes": "No") << '\n';
    }
    return 0;
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 17 ms 340 KB Output is correct
5 Correct 42 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 2 ms 340 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 47 ms 1900 KB Output is correct
10 Correct 74 ms 33652 KB Output is correct
11 Correct 8 ms 212 KB Output is correct
12 Correct 42 ms 340 KB Output is correct
13 Correct 79 ms 33596 KB Output is correct
14 Correct 80 ms 33596 KB Output is correct
15 Correct 124 ms 33628 KB Output is correct
16 Correct 241 ms 33592 KB Output is correct
17 Correct 95 ms 33676 KB Output is correct
18 Correct 101 ms 33612 KB Output is correct
19 Correct 85 ms 33644 KB Output is correct
20 Correct 83 ms 33660 KB Output is correct
21 Correct 81 ms 33612 KB Output is correct
22 Correct 83 ms 33572 KB Output is correct

Subtask #2
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Incorrect 2 ms 340 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Incorrect 2 ms 340 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 28.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Incorrect 2 ms 340 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 2 ms 340 KB Output is correct
4 Incorrect 2 ms 340 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 10 ms 212 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Incorrect 2 ms 340 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 17 ms 340 KB Output is correct
5 Correct 42 ms 340 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 2 ms 340 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 47 ms 1900 KB Output is correct
10 Correct 74 ms 33652 KB Output is correct
11 Correct 8 ms 212 KB Output is correct
12 Correct 42 ms 340 KB Output is correct
13 Correct 79 ms 33596 KB Output is correct
14 Correct 80 ms 33596 KB Output is correct
15 Correct 124 ms 33628 KB Output is correct
16 Correct 241 ms 33592 KB Output is correct
17 Correct 95 ms 33676 KB Output is correct
18 Correct 101 ms 33612 KB Output is correct
19 Correct 85 ms 33644 KB Output is correct
20 Correct 83 ms 33660 KB Output is correct
21 Correct 81 ms 33612 KB Output is correct
22 Correct 83 ms 33572 KB Output is correct
23 Correct 0 ms 212 KB Output is correct
24 Correct 0 ms 212 KB Output is correct
25 Correct 2 ms 340 KB Output is correct
26 Incorrect 2 ms 340 KB Output isn't correct
27 Halted 0 ms 0 KB -