#include<iostream>
#include<vector>
#include<algorithm>
#define ep emplace
#define eb emplace_back
#define fi first
#define se second
#define all(x) (x).begin(),(x).end()
using namespace std;
typedef long long ll;
typedef pair<int,int>pi;
typedef pair<ll,ll>pl;
const int inf=1e9+7;
const ll INF=1e18;
const int mx=300010;
vector<int>adj[mx];
int par[mx];
void dfs(int x,int p)
{
par[x]=p;
for(int&t:adj[x])
{
if(par[t]==0)
dfs(t,p^3);
else if(par[t]==p)
{
cout<<-1<<endl;
exit(0);
}
}
return;
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int n,m;
cin>>n>>m;
if(n%2==1)
return cout<<-1<<endl,0;
vector<pi>ev;
for(int i=0;i<m;i++)
{
int u,v;
cin>>u>>v;
ev.eb(u,v);
if(u==v)
return cout<<-1<<endl,0;
adj[u].eb(v);
adj[v].eb(u);
}
for(int i=0;i++<n;)
if(par[i]==0)
dfs(i,1);
for(pi&t:ev)
if(par[t.fi]==2)
cout<<1<<' '<<t.fi<<' '<<t.se<<'\n';
for(int i=1;i<n;i++)
cout<<2<<' '<<i<<' '<<i+1<<'\n';
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
5 ms |
7424 KB |
Integer 3 violates the range [1, 2] |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
6 ms |
7424 KB |
Integer 3 violates the range [1, 2] |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
5 ms |
7424 KB |
Integer 3 violates the range [1, 2] |
2 |
Halted |
0 ms |
0 KB |
- |