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- #include <iostream>
- using namespace std;
- int main ()
- {
- long long n,a[200001],b[200001],out[200001],i=0,j=0,k=0,l=0;
- cin>>n;
- for (i=0;i<n;i++)
- {
- cin>>a[i];
- cin>>b[i];
- }
- for (i=0;i<n;i++)
- {
- for(j=0;j<n;j++)
- {
- if(a[i]==b[j])
- {
- k++;
- break;
- }
- }
- if(k==0)
- {
- k=a[i]; break;
- }
- else
- k=0;
- }
- out[0]=k; k=0;
- for(i=0;i<n;i++)
- {
- if(a[i]==0)
- {
- out[1]=b[i];
- }
- }
- for(i=0;;i++)
- {
- for (j=0;j<n;j++)
- {
- if(out[i]==a[j] &&b[j]==0)
- {
- k++;
- break;
- }
- if(out[i]==a[j])
- {
- out[i+2]=b[j];
- break;
- }
- }
- if(k!=0)
- break;
- }
- for(i=0;i<n;i++)
- {
- cout<<out[i]<<" ";
- }
- return 0;
- }
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