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- #include <iostream>
- using namespace std;
- int st[30],n;
- void tipar(int k)
- {
- int i;
- for (i=1; i<=k; i++)
- cout<<st[i]<<" ";
- cout<<endl;
- }
- int valid (int k)
- {
- int i;
- for (i=1; i<=k-1; i++)
- if (st[k]==st[i]) return 0;
- if(k>1) if(st[k]-st[k-1]==1) return 0;
- return 1;
- }
- void bk(int k)
- {
- int i;
- for (i=1; i<=n; i++)
- {
- st[k]=i;
- if (valid(k))
- if (k==n) tipar(k);
- else bk(k+1);
- }
- }
- int main()
- {
- cin>>n;
- bk(1);
- return 0;
- }
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