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#include
#include
using namespace std; int main() { ios_base::sync_with_stdio(false); int n; cin >> n; int niza1[n], niza2[n]; for(int i = 0; i < n - 1; i++) { cin >> niza1[i]; cin >> niza2[i]; } int iskoristen_par[n]; for(int i = 0; i < n; i++) { iskoristen_par[i] = 0; } int prv = 0; cout << prv << " " ; for(int i = 0; i < n - 1; i++) { int pomosna = -1; for(int j = 0; j < n - 1; j++) { if(niza1[j] == prv and iskoristen_par[j] == 0) { prv = niza2[j]; pomosna = 0; iskoristen_par[j] = 1; break; } if(niza2[j] == prv and iskoristen_par[j] == 0) { prv = niza1[j]; iskoristen_par[j] = 1; pomosna = 0; break; } } if(pomosna == -1) { break; } cout << prv << " "; } int sosedi[n]; prv = n; sosedi[0] = prv; int indeks = 1; for(int i = 0; i < n - 1; i++) { int pomosna = -1; for(int j = 0; j < n - 1; j++) { if(prv == niza1[j] and iskoristen_par[j] == 0) { prv = niza2[j]; iskoristen_par[j] = 1; pomosna = 0; break; } if(prv == niza2[j] and iskoristen_par[j] == 0) { prv = niza1[j]; iskoristen_par[j] = 1; pomosna = 0; break; } } if(pomosna == -1) { break; } sosedi[indeks] = prv; indeks++; } for(int i = indeks - 1; i >= 0; i--) { cout << sosedi[i] << " "; } return 0; } /* 7 3 6 4 1 5 2 6 1 5 0 4 7 0 5 2 _ _ _ _ 7 **/
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everlasting (like CCCP)