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- #include <fstream>
- using namespace std;
- ifstream cin("preordine.in");
- ofstream cout("preordine.out");
- int n, X[1001], S[1001], D[1001], F[1001], r, h;
- void RSD(int v)
- {
- cout<<X[v]<<" ";
- if(S[v]!=0) RSD(S[v]);
- if(D[v]!=0) RSD(D[v]);
- }
- int main()
- {
- cin>>n;
- for(int i=1;i<=n;i++)
- cin>>X[i]>>S[i]>>D[i];
- for(int i=1;i<=n;i++)
- {
- F[S[i]]=1;
- F[D[i]]=1;
- }
- for(int i=1;i<=n;i++)
- if(F[i]==0)
- r=i;
- RSD(r);
- return 0;
- }
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