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Submission #958988

# Submission time Handle Problem Language Result Execution time Memory
958988 2024-04-07T10:54:18 Z Cyber_Wolf Pipes (CEOI15_pipes) C++17
30 / 100
 1297 ms 65536 KB 
#include <bits/stdc++.h>

using namespace std;

#define lg int
#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

const lg N = 1e5+5;

vector<lg> adj[N];
lg n,m, low[N], tin[N], tmp, id;
set<array<lg, 2>> se;

void dfs(lg src, lg par = -1)
{
	tin[src] = low[src] = ++tmp;
	for(auto it : adj[src])
	{
		if(it == par)
		{
			continue;
		}
		if(tin[it])
		{
			if(low[it] > tin[src])
			{
				if(se.find({it, src}) != se.end())	se.erase({it, src});
			}
			low[src] = min(low[src], tin[it]);
			continue;
		}
		dfs(it, src);
		low[src] = min(low[src], low[it]);
		if(low[it] > tin[src])
		{
			se.insert({it, src});
		}
	}
	// cout << src << ' ' << low[src] << '\n';
}

int main()
{
	fastio;
	cin >> n >> m;
	for(int i = 0; i < m; i++)
	{
		lg u, v;
		cin >> u >> v;
		adj[u].push_back(v);
		adj[v].push_back(u);
	}
	for(int i = 1; i <= n; i++)
	{
		if(!tin[i])	dfs(i);
	}
	for(auto [a, b] : se)	cout << a << ' ' << b << '\n';

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 3420 KB Output is correct
2 Correct 1 ms 3420 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 3932 KB Output is correct
2 Correct 3 ms 3676 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 78 ms 11492 KB Output is correct
2 Correct 74 ms 10836 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 151 ms 14932 KB Output is correct
2 Runtime error 174 ms 19544 KB Memory limit exceeded
3 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 254 ms 26196 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 432 ms 32596 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 680 ms 54872 KB Memory limit exceeded
2 Halted 0 ms 0 KB -

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 915 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 1221 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 1297 ms 65536 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -