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- #include <iostream>
- using namespace std;
- int n,X[12],F[5],m;
- void afisare()
- {
- for(int i=1;i<=m;++i)
- cout<<X[i];
- cout<<'\n';
- }
- void back(int k)
- {
- for(int i=1;i<=n;++i)
- if(F[i])
- {
- X[k]=i;
- --F[i];
- if(k==m)
- afisare();
- else
- back(k+1);
- ++F[i];
- }
- }
- int main()
- {
- cin>>n;
- for(int i=1;i<=n;++i)
- F[i]=i;
- m=n*(n+1)/2;
- back(1);
- return 0;
- }
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