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- #include <iostream>
- using namespace std;
- int n,st[52];
- void tipar()
- { int i;
- for (i=1;i<=n;i++)
- cout<<st[i]<<' ';
- cout<<endl;
- }
- int valid(int k)
- {
- int i;
- for (i=1;i<k;i++)
- if (st[i]==st[k]) return 0;
- if (k>1)
- if (st[k]==st[k-1]+1) return 0;
- return 1;
- }
- void back(int k)
- {
- int i;
- for (i=1;i<=n;i++)
- {
- st[k]=i;
- if (valid(k))
- if (k==n) tipar();
- else back(k+1);
- }
- }
- int main()
- {
- cin>>n;
- back(1);
- return 0;
- }
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