#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;
vector<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])
{
low[src] = min(low[src], tin[it]);
continue;
}
dfs(it, src);
low[src] = min(low[src], low[it]);
}
if((~par) && low[src] > tin[par])
{
se.push_back({min(par, src), max(par, 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);
}
sort(se.begin(), se.end());
for(int i = 0; i < se.size(); i++)
{
if(i && se[i] == se[i-1]) continue;
if(i+1 < se.size() && se[i] == se[i+1]) continue;
cout << se[i][0] << ' ' << se[i][1] << '\n';
}
return 0;
}
Compilation message
pipes.cpp: In function 'int main()':
pipes.cpp:54:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
54 | for(int i = 0; i < se.size(); i++)
| ~~^~~~~~~~~~~
pipes.cpp:57:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
57 | if(i+1 < se.size() && se[i] == se[i+1]) continue;
| ~~~~^~~~~~~~~~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1 ms |
3160 KB |
Output is correct |
2 |
Incorrect |
1 ms |
3160 KB |
Wrong number of edges |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3 ms |
3932 KB |
Output is correct |
2 |
Incorrect |
3 ms |
3672 KB |
Wrong number of edges |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
92 ms |
11344 KB |
Output is correct |
2 |
Correct |
75 ms |
10692 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
136 ms |
14928 KB |
Output is correct |
2 |
Runtime error |
174 ms |
19132 KB |
Memory limit exceeded |
3 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
295 ms |
25872 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
440 ms |
31624 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
705 ms |
62704 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
960 ms |
65536 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
1191 ms |
65536 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
1354 ms |
65536 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |