#include <bits/stdc++.h>
using namespace std;
const int M = 2e5 + 1;
vector<int> nei[M];
int cnt[M][2],dep[M];
bool vis[M];
void bfs(int u)
{
queue<int> q;
vis[u]=1;
q.push(u);
while (!q.empty())
{
int v=q.front();
q.pop();
for (int i:nei[v])
if (!vis[i])
{
vis[i]=1;
dep[i]=1+dep[v];
q.push(i);
}
}
}
signed main()
{
int n,m;
cin>>n>>m;
for (int i=0;i<m;i++)
{
int a,b;
cin>>a>>b;
nei[a].push_back(b);
nei[b].push_back(a);
cnt[a][0]++;
cnt[b][1]++;
}
int v=-1,d=0;
for (int i=1;i<=n;i++)
if (!cnt[i][0] || !cnt[i][1])
{
v=i;
if (cnt[i][0])
d=1;
break;
}
if (v==-1)
{
cout<<-1<<endl;
return 0;
}
bfs(v);
vector<pair<int,int>> ver;
for (int i=1;i<=n;i++)
ver.push_back({dep[i],i});
sort(ver.rbegin(),ver.rend());
cout<<ver.size()<<endl;
for (auto i:ver)
cout<<i.second<<' '<<(i.first+d)%2<<endl;
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
3 ms |
4952 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
351 ms |
19904 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
3 ms |
4952 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |