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  1. #include <iostream>
  2. #include <cstdio>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int p, n, x, a[305], idx=-1;
  7. 	for(int i=0; i<305; i++) a[i]=0;
  8. 	scanf("%d%d", &p, &n);
  9. 	for(int i=0; i<n; i++) {
  10. 		scanf("%d", &x); 
  11. 		if(a[x%p]==0) a[x%p]++;
  12. 		else {
  13. 			idx=i+1;
  14. 			break;
  15. 		}
  16. 	}
  17. 	printf("%d", idx);
  18. 	return 0;
  19. }
Success #stdin #stdout 0s 3300KB
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stdin
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5 5
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-1
https://ideone.com/EZ6IdH
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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