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- #include <cstdio>
- const int NBCARTES = 1e6;
- bool carteDejaVu[NBCARTES+1];
- int main()
- {
- int nbPersonnes;
- scanf("%d", &nbPersonnes);
- for(int idPers = 0; idPers < nbPersonnes; idPers++)
- {
- int numCarte;
- scanf("%d", &numCarte);
- if(carteDejaVu[numCarte])
- {
- printf("%d\n", numCarte);
- return 0;
- }
- carteDejaVu[numCarte] = true;
- }
- printf("-1\n");
- return 0;
- }
- #include <cstdio>
- const int NBCARTES = 1e6;
- bool carteDejaVu[NBCARTES+1];
- int main()
- {
- int nbPersonnes, numCarte;
- scanf("%d", &nbPersonnes);
- for(int idPers = 0; idPers < nbPersonnes; idPers++)
- {
- scanf("%d", &numCarte);
- if(carteDejaVu[numCarte])
- {
- printf("%d\n", numCarte);
- return 0;
- }
- carteDejaVu[numCarte] = true;
- }
- printf("-1\n");
- return 0;
- }
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