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- #include <stdio.h>
- #include <stdlib.h>
- #define MAX 1000000 + 1
- int main()
- {
- int nAlunos, i, Count = 0;
- scanf("%d", &nAlunos);
- int Pres[MAX];
- for(i = 0; i <= MAX; i++)
- Pres[i] = 0;
- for(i = 0; i < nAlunos; i++) {
- int aux;
- scanf("%d", &aux);
- Pres[aux] = 1;
- }
- for(i = 0; i <= MAX; i++)
- if(Pres[i] == 1)
- Count++;
- printf("%d\n", Count);
- return 0;
- }
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