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  1. #include<stdio.h>
  2. #define ll long long 
  3. #include<math.h>
  4. int gcd(int a, int b){
  5. 	while(b > 0){
  6. 		int tmp = a % b;
  7. 		a = b; 
  8. 		b = tmp;
  9. 	}
  10. 	return a;
  11. }
  12. int main(){
  13.     int n;
  14.     scanf("%d",&n);
  15.     int a[n];
  16.     for(int i = 0; i < n; i++){
  17.     	scanf("%d",&a[i]);
  18. 	}
  19. 	int cnt = 0; 
  20. 	for(int i = 0; i < n; i++){
  21. 		for(int j = i+1 ; j < n; j++ ){
  22. 			if(gcd(a[i], a[j]) == 1){
  23. 				cnt++;
  24. 			}
  25. 		}
  26. 	}
  27. 	printf("%d", cnt);
  28. 	return 0;
  29. }
Success #stdin #stdout 0.01s 5300KB
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https://ideone.com/ZAA72l
bai6_demcapsonguyentocungnhau
language:
C (gcc 8.3)
created:
19 days ago
visibility:
public

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