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- #include <iostream>
- #define NR 20
- using namespace std;
- int x[NR],n,k;
- void afis(int k)
- {
- if(k%2)
- {
- for(int i=1;i<=k;++i)
- cout<<x[i]<<' ';
- cout<<'\n';
- }
- }
- bool valid(int k)
- {
- if(k==1)
- return true;
- if(x[k]>x[k-1])
- return true;
- return false;
- }
- void backtracking(int k){
- for(int i=1;i<=n;++i)
- {
- x[k]=i;
- if(valid(k))
- {
- afis(k);
- backtracking(k+1);
- }
- }
- }
- int main()
- {
- cin>>n;
- backtracking(1);
- return 0;
- }
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