oj.uz

Submission #948413

# Submission time Handle Problem Language Result Execution time Memory
948413 2024-03-18T05:31:14 Z vjudge1 Pipes (CEOI15_pipes) C++17
30 / 100
 87 ms 16268 KB 
#include <bits/stdc++.h>
using namespace std;
//#define int long long
#define all(x) x.begin(), x.end()
#define size(x) (int)x.size()

const short N = 5000;

vector<pair<short, int>> g[N];
bool vis[N];
int tin[N], fup[N], timer;
vector<pair<short, short>> bridges;
 
void dfs(short v, short p = -1, int idx = -1) {
  vis[v] = true;
  tin[v] = fup[v] = ++timer;
  for (auto [to, new_idx] : g[v]) {
    if (idx == new_idx) continue;
    else if (vis[to]) fup[v] = min(fup[v], tin[to]);
    else {
      dfs(to, v, new_idx);
      fup[v] = min(fup[v], fup[to]);
      if (fup[to] > tin[v]) {
        bridges.push_back({v, to});
      }
    }
  }
}

signed main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  short n; int m;
  cin >> n >> m;
  for (int i = 0; i < m; ++i) {
    short a, b; cin >> a >> b;
    a--, b--;
    g[a].push_back({b, i});
    g[b].push_back({a, i});
  }
  for (short i = 0; i < n; ++i) {
    if (!vis[i]) dfs(i);
  }
  for (auto [a, b] : bridges) {
    cout << a + 1 << ' ' << b + 1 << '\n';
  }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 1116 KB Output is correct
2 Correct 3 ms 860 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 87 ms 16268 KB Output is correct
2 Correct 85 ms 15388 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 604 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 604 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 860 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 860 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 860 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 860 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 860 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -