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- #include <iostream>
- #include <fstream>
- using namespace std;
- int n,m,L,a[101][101],x[11],nrsol,start;
- void citire()
- {
- cin>>n>>m;
- for(int p=1;p<=m;p++)
- {
- int i,j;
- cin>>i>>j;
- a[i][j]=a[j][i]=1;
- }
- cin>>start>>L;
- }
- void afisare(int k)
- {
- for(int i=1;i<=n;i++)
- cout<<x[i]<<' ';
- cout<<'\n';
- }
- int valid(int k)
- {
- if(a[x[k]][x[k-1]]==0)
- return 0;
- for(int i=1;i<k;i++)
- if(x[i]==x[k])
- return 0;
- return 1;
- }
- void back(int k)
- {
- for(int i=1;i<=n;i++)
- {
- x[k]=i;
- if(valid(k))
- {
- if(k-1==L)
- {afisare(k);
- nrsol++;}
- else back(k+1);
- }
- }
- }
- int main()
- {
- citire();
- x[1]=start;
- back(2);
- if(nrsol==0)
- cout<<"nu exista lanturi de lungime k";
- return 0;
- }
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