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  1. // 
  2. // 
  3. #include <stdio.h>
  4.  
  5. int main()
  6. {
  7.     int n,k,i,b,count=0;
  8.     double avg=0.0;
  9.     scanf("%d",&n);
  10.     int a[6];
  11.     for(i=0;i<6;i++)
  12.     a[i]=0;
  13.     for(i=0;i<n;i++)
  14.     {
  15.        scanf("%d ",&b);
  16.        a[b]++;
  17.     }
  18.     for(i=0;i<6;i++)
  19.     {
  20.         avg+=a[i]*i;
  21. 	}
  22. 	avg/=n;
  23. 	if(avg>=4.5)
  24. 	printf("0\n");
  25. 	else
  26. 	{
  27. 	    i=0;
  28. 	    while(i<6 && avg)
  29. 	    {
  30. 	        if(a[i]!=0)
  31. 	        {
  32. 	            avg= avg*n -i + 5.0;
  33. 	            a[i]--;
  34. 	            count++;
  35. 	        }
  36. 	        else 
  37. 	        {i++;continue;}
  38. 	        avg=avg/n;
  39. 	        if(avg>=4.5)
  40. 	        break;
  41. 	    }
  42. 	    printf("%d\n",count);
  43. 	}
  44. 	return 0;
  45. }
Success #stdin #stdout 0s 4336KB
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stdin
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100
3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
stdout
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https://ideone.com/fNrNDf
language:
C (gcc 8.3)
created:
5 years ago
visibility:
public

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