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- #include <iostream>
- using namespace std;
- ifstream cin("preordine.in");
- ofstream cout("preordine.out");
- int n, info[1001], st[1001], dr[1001], t[1001], r, h;
- void preordine(int v)
- {
- if(v!=0)
- {
- cout<< info[v] << " ";
- preordine(st[v]);
- preordine(dr[v]);
- }
- }
- int main()
- {
- cin >> n;
- for(int i=1;i<=n;i++)
- cin >> info[i] >> st[i] >> dr[i];
- for(int i=1;i<=n;i++)
- {
- t[st[i]]=1;
- t[dr[i]]=1;
- }
- for(int i=1;i<=n;i++)
- if(t[i]==0)
- r=i;
- preordine(r);
- return 0;
- }
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