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Submission #554554

# Submission time Handle Problem Language Result Execution time Memory
554554 2022-04-28T17:46:50 Z MilosMilutinovic One-Way Streets (CEOI17_oneway) C++14
100 / 100
 86 ms 16988 KB 
#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);  
  int n, m;
  cin >> n >> m;
  vector<vector<pair<int, int>>> g(n);
  vector<tuple<int, int, int>> edges;
  for (int i = 0; i < m; i++) {
    int x, y;
    cin >> x >> y;
    --x; --y;
    g[x].emplace_back(y, i);
    g[y].emplace_back(x, i);
    edges.emplace_back(x, y, i);
  }
  int p;
  cin >> p;
  vector<int> f(n);
  while (p--) {
    int x, y;
    cin >> x >> y;
    --x; --y;
    f[x] += 1;
    f[y] -= 1;
  }
  vector<bool> was(n, false);
  vector<bool> bridge(m);
  vector<int> col(m);
  vector<int> tin(n);
  vector<int> low(n);
  int t = 0;
  function<void(int, int)> Dfs = [&](int v, int id) {
    was[v] = true;
    tin[v] = ++t;
    low[v] = t;
    for (auto& e : g[v]) {
      int to = e.first;
      int i = e.second;  
      if (i == id) {
        continue;
      }
      if (was[to]) {
        low[v] = min(low[v], tin[to]);
      } else {
        Dfs(to, i);      
        if (low[to] > tin[v]) {
          bridge[i] = true;
        }
        low[v] = min(low[v], low[to]);
        int cx = (get<0>(edges[i]) == v ? 1 : -1);
        int cy = (f[to] == 0 ? 0 : (f[to] > 0 ? 1 : -1));
        col[i] = cx * cy;
        f[v] += f[to];
      }
    }
  };
  for (int i = 0; i < n; i++) {
    if (!was[i]) {
      Dfs(i, -1);
    }
  }
  for (int i = 0; i < m; i++) {
    if (!bridge[i] || col[i] == 0) {
      cout << 'B';
    } else {  
      cout << (col[i] == 1 ? 'L' : 'R');
    }
  }
  cout << '\n';                                                   
  return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 328 KB Output is correct
4 Correct 1 ms 328 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 464 KB Output is correct
8 Correct 1 ms 328 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 328 KB Output is correct
4 Correct 1 ms 328 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 464 KB Output is correct
8 Correct 1 ms 328 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 44 ms 7768 KB Output is correct
12 Correct 42 ms 9112 KB Output is correct
13 Correct 72 ms 10760 KB Output is correct
14 Correct 70 ms 12140 KB Output is correct
15 Correct 63 ms 12372 KB Output is correct
16 Correct 62 ms 10332 KB Output is correct
17 Correct 54 ms 12200 KB Output is correct
18 Correct 67 ms 10348 KB Output is correct
19 Correct 49 ms 13652 KB Output is correct
20 Correct 43 ms 9156 KB Output is correct
21 Correct 49 ms 8764 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 328 KB Output is correct
4 Correct 1 ms 328 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 464 KB Output is correct
8 Correct 1 ms 328 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 44 ms 7768 KB Output is correct
12 Correct 42 ms 9112 KB Output is correct
13 Correct 72 ms 10760 KB Output is correct
14 Correct 70 ms 12140 KB Output is correct
15 Correct 63 ms 12372 KB Output is correct
16 Correct 62 ms 10332 KB Output is correct
17 Correct 54 ms 12200 KB Output is correct
18 Correct 67 ms 10348 KB Output is correct
19 Correct 49 ms 13652 KB Output is correct
20 Correct 43 ms 9156 KB Output is correct
21 Correct 49 ms 8764 KB Output is correct
22 Correct 66 ms 13444 KB Output is correct
23 Correct 66 ms 11448 KB Output is correct
24 Correct 76 ms 11488 KB Output is correct
25 Correct 74 ms 16988 KB Output is correct
26 Correct 69 ms 12928 KB Output is correct
27 Correct 86 ms 11640 KB Output is correct
28 Correct 48 ms 5180 KB Output is correct
29 Correct 67 ms 9788 KB Output is correct
30 Correct 60 ms 10012 KB Output is correct
31 Correct 66 ms 10420 KB Output is correct
32 Correct 59 ms 12804 KB Output is correct