oj.uz

답안 #554544

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
554544 2022-04-28T16:29:55 Z 600Mihnea Jail (JOI22_jail) C++17
49 / 100
 5000 ms 46324 KB 
#include <bits/stdc++.h>

bool home = 1;

using namespace std;

const int N = 120000 + 7; // change this!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
const int K = 20;
int n;
int m;
int bad;
int vis[N];
int act[N];
vector<int> g[N];
vector<int> relations[N];
pair<int, int> paths[N];
int first[N];
int last[N];
int top;
int depth[N];
int lg[2 * N];
pair<int, int> rmq[K][N];

void dfs(int a, int p, int dep) {
  depth[a] = dep;
  {
    vector<int> kids;
    for (auto &b : g[a]) {
      if (b == p) continue;
      kids.push_back(b);
    }
    g[a] = kids;
  }
  rmq[0][++top] = {dep, a};
  first[a] = last[a] = top;

  for (auto &b : g[a]) {
    dfs(b, a, dep + 1);
    rmq[0][++top] = {dep, a};
    last[a] = top;
  }
}

int get_lca(int a, int b) {
  assert(1 <= a && a <= n);
  assert(1 <= b && b <= n);
  if (first[a] > last[b]) swap(a, b);
  a = first[a];
  b = last[b];
  assert(a <= b);
  int k = lg[b - a + 1];
  return min(rmq[k][a], rmq[k][b - (1 << k) + 1]).second;
}

bool is_on_path(int a, int query, int b) {
  int c = get_lca(a, b);
  if (get_lca(c, query) == c) {
    return get_lca(a, query) == query || get_lca(b, query) == query;
  }
  return 0;
}

void check_for_cycle(int a) {
  vis[a] = act[a] = 1;
  for (auto &b : relations[a]) {
    if (act[b]) {
      bad = 1;
    }
    if (!vis[b]) {
      check_for_cycle(b);
    }
  }
  act[a] = 0;
}

signed main() {
#ifdef ONLINE_JUDGE
  home = 0;
#endif
  home = 0;

  if (home) {
    freopen("I_am_iron_man", "r", stdin);
  }
  else {
    ios::sync_with_stdio(0); cin.tie(0);
  }


  int Tests;
  cin >> Tests;
  for (int tc = 1; tc <= Tests; tc++) {
    bad = 0;
    cin >> n;
    for (int i = 1; i <= n; i++) g[i].clear(), relations[i].clear(), vis[i] = 0;
    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;
    for (int i = 1; i <= m; i++) {
      cin >> paths[i].first >> paths[i].second;
    }
    top = 0;
    dfs(1, -1, 0);
    for (int i = 2; i <= top; i++) {
      lg[i] = 1 + lg[i / 2];
    }
    for (int k = 1; (1 << k) <= top; k++) {
      for (int i = 1; i + (1 << k) - 1 <= top; i++) {
        rmq[k][i] = min(rmq[k - 1][i], rmq[k - 1][i + (1 << (k - 1))]);
      }
    }
    /**for (int i = 1; i <= n; i++) {
      assert(get_lca(i, i) == i);
      assert(get_lca(1, i) == 1);
      for (int j = 1; j <= n; j++) {
        assert(get_lca(i, j) == get_lca(j, i));
        if (1 < i && i < j) {
          cout << i << " " << j << " -> " << get_lca(i, j) << "\n";
        }
      }
    }**/

    for (int i = 1; i <= m; i++) {
      for (int j = 1; j <= m; j++) {
        if (i == j) {
          continue;
        }
        int a = paths[i].first, b = paths[i].second;
        int x = paths[j].first, y = paths[j].second;

        if (is_on_path(a, x, b)) {
          relations[i].push_back(j);
        }

        if (is_on_path(a, y, b)) {
          relations[j].push_back(i);
        }
      }
    }

    for (int i = 1; i <= n; i++) {
      if (!vis[i]) {
        check_for_cycle(i);
      }
    }

    cout << ((!bad) ? ("Yes") : ("No")) << "\n";
  }

}

Compilation message

jail.cpp: In function 'int main()':
jail.cpp:83:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |     freopen("I_am_iron_man", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5972 KB Output is correct
2 Correct 3 ms 5972 KB Output is correct
3 Correct 3 ms 5972 KB Output is correct
4 Correct 13 ms 6072 KB Output is correct
5 Correct 26 ms 6112 KB Output is correct
6 Correct 4 ms 6052 KB Output is correct
7 Correct 5 ms 6100 KB Output is correct
8 Correct 13 ms 6120 KB Output is correct
9 Correct 251 ms 11224 KB Output is correct
10 Correct 69 ms 45416 KB Output is correct
11 Correct 13 ms 6180 KB Output is correct
12 Correct 150 ms 7328 KB Output is correct
13 Execution timed out 5027 ms 46324 KB Time limit exceeded
14 Halted 0 ms 0 KB -

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5972 KB Output is correct
2 Correct 3 ms 5972 KB Output is correct
3 Correct 4 ms 6100 KB Output is correct
4 Correct 5 ms 6116 KB Output is correct
5 Correct 5 ms 6100 KB Output is correct
6 Correct 5 ms 6104 KB Output is correct
7 Correct 5 ms 6108 KB Output is correct
8 Correct 5 ms 6108 KB Output is correct
9 Correct 6 ms 6100 KB Output is correct
10 Correct 5 ms 6100 KB Output is correct
11 Correct 5 ms 6112 KB Output is correct
12 Correct 4 ms 6108 KB Output is correct
13 Correct 4 ms 6100 KB Output is correct

Subtask #3
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5972 KB Output is correct
2 Correct 3 ms 5972 KB Output is correct
3 Correct 4 ms 6100 KB Output is correct
4 Correct 5 ms 6116 KB Output is correct
5 Correct 5 ms 6100 KB Output is correct
6 Correct 5 ms 6104 KB Output is correct
7 Correct 5 ms 6108 KB Output is correct
8 Correct 5 ms 6108 KB Output is correct
9 Correct 6 ms 6100 KB Output is correct
10 Correct 5 ms 6100 KB Output is correct
11 Correct 5 ms 6112 KB Output is correct
12 Correct 4 ms 6108 KB Output is correct
13 Correct 4 ms 6100 KB Output is correct
14 Correct 3 ms 5972 KB Output is correct
15 Correct 3 ms 5972 KB Output is correct
16 Correct 6 ms 6116 KB Output is correct
17 Correct 5 ms 6100 KB Output is correct
18 Correct 5 ms 6104 KB Output is correct
19 Correct 3 ms 5968 KB Output is correct
20 Correct 5 ms 6104 KB Output is correct
21 Correct 5 ms 6100 KB Output is correct
22 Correct 5 ms 6100 KB Output is correct
23 Correct 4 ms 5972 KB Output is correct
24 Correct 4 ms 5972 KB Output is correct
25 Correct 5 ms 6236 KB Output is correct
26 Correct 4 ms 5972 KB Output is correct
27 Correct 5 ms 6100 KB Output is correct
28 Correct 3 ms 5972 KB Output is correct

Subtask #4
28.0 / 28.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5972 KB Output is correct
2 Correct 3 ms 5972 KB Output is correct
3 Correct 4 ms 6100 KB Output is correct
4 Correct 5 ms 6116 KB Output is correct
5 Correct 5 ms 6100 KB Output is correct
6 Correct 5 ms 6104 KB Output is correct
7 Correct 5 ms 6108 KB Output is correct
8 Correct 5 ms 6108 KB Output is correct
9 Correct 6 ms 6100 KB Output is correct
10 Correct 5 ms 6100 KB Output is correct
11 Correct 5 ms 6112 KB Output is correct
12 Correct 4 ms 6108 KB Output is correct
13 Correct 4 ms 6100 KB Output is correct
14 Correct 3 ms 5972 KB Output is correct
15 Correct 3 ms 5972 KB Output is correct
16 Correct 6 ms 6116 KB Output is correct
17 Correct 5 ms 6100 KB Output is correct
18 Correct 5 ms 6104 KB Output is correct
19 Correct 3 ms 5968 KB Output is correct
20 Correct 5 ms 6104 KB Output is correct
21 Correct 5 ms 6100 KB Output is correct
22 Correct 5 ms 6100 KB Output is correct
23 Correct 4 ms 5972 KB Output is correct
24 Correct 4 ms 5972 KB Output is correct
25 Correct 5 ms 6236 KB Output is correct
26 Correct 4 ms 5972 KB Output is correct
27 Correct 5 ms 6100 KB Output is correct
28 Correct 3 ms 5972 KB Output is correct
29 Correct 14 ms 6232 KB Output is correct
30 Correct 11 ms 6100 KB Output is correct
31 Correct 10 ms 6100 KB Output is correct
32 Correct 7 ms 6100 KB Output is correct
33 Correct 5 ms 6100 KB Output is correct
34 Correct 17 ms 6144 KB Output is correct
35 Correct 20 ms 6100 KB Output is correct
36 Correct 17 ms 6100 KB Output is correct
37 Correct 12 ms 6100 KB Output is correct

Subtask #5
0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5972 KB Output is correct
2 Correct 3 ms 5972 KB Output is correct
3 Correct 4 ms 6100 KB Output is correct
4 Correct 5 ms 6116 KB Output is correct
5 Correct 5 ms 6100 KB Output is correct
6 Correct 5 ms 6104 KB Output is correct
7 Correct 5 ms 6108 KB Output is correct
8 Correct 5 ms 6108 KB Output is correct
9 Correct 6 ms 6100 KB Output is correct
10 Correct 5 ms 6100 KB Output is correct
11 Correct 5 ms 6112 KB Output is correct
12 Correct 4 ms 6108 KB Output is correct
13 Correct 4 ms 6100 KB Output is correct
14 Correct 3 ms 5972 KB Output is correct
15 Correct 3 ms 5972 KB Output is correct
16 Correct 6 ms 6116 KB Output is correct
17 Correct 5 ms 6100 KB Output is correct
18 Correct 5 ms 6104 KB Output is correct
19 Correct 3 ms 5968 KB Output is correct
20 Correct 5 ms 6104 KB Output is correct
21 Correct 5 ms 6100 KB Output is correct
22 Correct 5 ms 6100 KB Output is correct
23 Correct 4 ms 5972 KB Output is correct
24 Correct 4 ms 5972 KB Output is correct
25 Correct 5 ms 6236 KB Output is correct
26 Correct 4 ms 5972 KB Output is correct
27 Correct 5 ms 6100 KB Output is correct
28 Correct 3 ms 5972 KB Output is correct
29 Correct 14 ms 6232 KB Output is correct
30 Correct 11 ms 6100 KB Output is correct
31 Correct 10 ms 6100 KB Output is correct
32 Correct 7 ms 6100 KB Output is correct
33 Correct 5 ms 6100 KB Output is correct
34 Correct 17 ms 6144 KB Output is correct
35 Correct 20 ms 6100 KB Output is correct
36 Correct 17 ms 6100 KB Output is correct
37 Correct 12 ms 6100 KB Output is correct
38 Correct 256 ms 10800 KB Output is correct
39 Correct 73 ms 45740 KB Output is correct
40 Correct 442 ms 10204 KB Output is correct
41 Correct 535 ms 8600 KB Output is correct
42 Correct 455 ms 10300 KB Output is correct
43 Correct 37 ms 8996 KB Output is correct
44 Correct 313 ms 6672 KB Output is correct
45 Incorrect 106 ms 31180 KB Output isn't correct
46 Halted 0 ms 0 KB -

Subtask #6
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5972 KB Output is correct
2 Correct 4 ms 5916 KB Output is correct
3 Correct 3 ms 5972 KB Output is correct
4 Correct 3 ms 5956 KB Output is correct
5 Correct 12 ms 6032 KB Output is correct
6 Correct 4 ms 5972 KB Output is correct
7 Correct 4 ms 5972 KB Output is correct
8 Correct 4 ms 5972 KB Output is correct
9 Correct 4 ms 5968 KB Output is correct
10 Correct 4 ms 5972 KB Output is correct
11 Correct 3 ms 5972 KB Output is correct
12 Correct 15 ms 6100 KB Output is correct
13 Correct 172 ms 6476 KB Output is correct
14 Correct 106 ms 6816 KB Output is correct
15 Correct 129 ms 6584 KB Output is correct
16 Execution timed out 5060 ms 30964 KB Time limit exceeded
17 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5972 KB Output is correct
2 Correct 3 ms 5972 KB Output is correct
3 Correct 3 ms 5972 KB Output is correct
4 Correct 13 ms 6072 KB Output is correct
5 Correct 26 ms 6112 KB Output is correct
6 Correct 4 ms 6052 KB Output is correct
7 Correct 5 ms 6100 KB Output is correct
8 Correct 13 ms 6120 KB Output is correct
9 Correct 251 ms 11224 KB Output is correct
10 Correct 69 ms 45416 KB Output is correct
11 Correct 13 ms 6180 KB Output is correct
12 Correct 150 ms 7328 KB Output is correct
13 Execution timed out 5027 ms 46324 KB Time limit exceeded
14 Halted 0 ms 0 KB -