#include <iostream>
#include <vector>
using namespace std;
#define speed ios_base::sync_with_stdio(false); cin.tie(0)
typedef vector<int> vi;
#define pb push_back
#define REP(i, a, b) for(int i = a; i < b; i++)
#define MAXN 100005
vi adj[MAXN], adj_dfs3[MAXN];
int h[MAXN], bEdgeD[MAXN], bEdgeU[MAXN], crossEdges[MAXN], par[MAXN];
bool visited[MAXN];
void dfs(int x) {
visited[x] = true;
for(auto i: adj[x]) if(!visited[i]) {
par[i]=x;
adj_dfs3[x].pb(i);
adj_dfs3[i].pb(x);
h[i]=h[x]+1;
dfs(i);
}
}
int dp(int x) {
if(~crossEdges[x]) return crossEdges[x];
crossEdges[x]=bEdgeU[x]-bEdgeD[x];
for(auto i:adj_dfs3[x]) if(h[i]>h[x]) crossEdges[x]+=dp(i);
return crossEdges[x];
}
int32_t main() {
speed;
int N, E, A, B, ans; cin >> N >> E;
REP(i,0,E) {
cin>>A>>B;
adj[A].pb(B);
adj[B].pb(A);
}
REP(i,1,N+1)if(!visited[i]) dfs(i);
REP(i,1,N+1) for(auto j: adj[i]) {
if(h[i]>h[j]) bEdgeU[i]++;
else bEdgeD[i]++;
}
REP(i,1,N+1) crossEdges[i]=-1;
REP(i,1,N+1) if(par[i] && dp(i)==1) cout << i << " " << par[i] << "\n";
}
Compilation message
pipes.cpp: In function 'int32_t main()':
pipes.cpp:30:21: warning: unused variable 'ans' [-Wunused-variable]
30 | int N, E, A, B, ans; cin >> N >> E;
| ^~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3 ms |
4948 KB |
Output is correct |
2 |
Correct |
3 ms |
4948 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
9 ms |
5844 KB |
Output is correct |
2 |
Correct |
7 ms |
5552 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
114 ms |
13340 KB |
Output is correct |
2 |
Correct |
103 ms |
12728 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
206 ms |
16880 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
435 ms |
28024 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
651 ms |
34640 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
1153 ms |
56552 KB |
Memory limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
1280 ms |
65536 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
1531 ms |
65536 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Runtime error |
1713 ms |
65536 KB |
Execution killed with signal 9 |
2 |
Halted |
0 ms |
0 KB |
- |