oj.uz

Submission #731330

# Submission time Handle Problem Language Result Execution time Memory
731330 2023-04-27T10:18:32 Z esomer Pipes (CEOI15_pipes) C++17
20 / 100
 980 ms 65536 KB 
#include<bits/stdc++.h>
 
using namespace std;
 
#define endl "\n"

typedef long long int ll;
 
const int MOD = 1e9 + 7;

vector<pair<int, int>> pipes;
int cnt = 1;

void DFS(int x, vector<vector<pair<int, int>>>& adj, vector<int>& vis, vector<int>& mn, int edge){
	vis[x] = cnt; mn[x] = cnt; cnt++;
	for(pair<int, int> pr : adj[x]){
		int node = pr.first;
		if(pr.second == edge) continue;
		if(vis[node] > 0){
			mn[x] = min(mn[x], vis[node]);
		}else{
			DFS(node, adj, vis, mn, pr.second);
			mn[x] = min(mn[x], mn[node]);
			if(mn[node] > vis[x]){
				pipes.push_back({node, x});
			}
		}
	}
}

void solve(){
	int n, m; cin >> n >> m;
	vector<vector<pair<int, int>>> adj(n);
	for(int i = 0; i < m; i++){
		int u, v; cin >> u >> v; u--; v--;
		adj[u].push_back({v, i}); adj[v].push_back({u, i});
	}
	vector<int> vis(n, 0);
	vector<int> mn(n, 0);
	for(int i = 0; i < n; i++){
		if(!vis[i]){
			DFS(i, adj, vis, mn, -1);
		}
	}
	for(auto p : pipes) cout << p.first + 1 << " " << p.second + 1 << endl;
}

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

    //~ int tt; cin >> tt;
    int tt = 1;
    for(int t = 1; t <= tt; t++){
        solve();
    }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 1156 KB Output is correct
2 Correct 3 ms 852 KB Output is correct

Subtask #3
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 115 ms 16440 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 202 ms 22912 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 393 ms 43792 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 616 ms 52936 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 854 ms 65536 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 980 ms 65536 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 956 ms 65536 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 898 ms 65536 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -