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- #include<iostream>
- int v[20],n,sum;
- int afisare(int k)
- {
- int i;
- for(i=0;i<=k;i++)
- {
- std::cout<<v[i]<<"+";
- }
- }
- int valid(int k)
- {
- int i,prim=0;
- for(i=1;i<=n/2;i++)
- {
- if(v[k]%i==0)
- {
- prim++;
- }
- }
- if(prim==2)
- {
- return 1;
- }
- else
- {
- return 0;
- }
- }
- int backtrack(int k)
- {
- int val;
- for(val=1;val<=n;val++)
- {
- v[k]=val;
- if(valid(k))
- {
- if(k==n-1)
- {
- afisare(k);
- }
- }
- else
- {
- backtrack(k+1);
- }
- }
- }
- int main()
- {
- std::cout<<"n=";
- std::cin>>n;
- backtrack(0);
- return 0;
- }
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