Submission #2006

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
2006	2013-07-19 15:35:42	gs13105	지우개 (GA4_eraser)	C++98	48 / 100	16 ms	1668 KiB

eraser

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#include <stdio.h>
#define d 1000000007
long long arr[100001];
int main()
{
  int n,i;
  long long sum1=0,sum2=0,sum3=0,vol;
  scanf("%d",&n);
  for(i=0;i<n;i++)
  {
    scanf("%d",&arr[i]);
    sum1+=arr[i];
    sum1%=d;
    sum2+=arr[i]*arr[i];
    sum2%=d;
    sum3+=((arr[i]*arr[i])%d)*arr[i];
    sum3%=d;
  }
  vol=((((sum1*sum1)%d)*sum1)%d-sum3)%d;
  for(i=0;i<n;i++)
  {
    vol-=(3*((arr[i]*arr[i])%d)*(sum1-arr[i]))%d;
    vol+=d;
    vol%=d;
  }
  while(vol%6!=0)
    vol+=d;
  vol/=6;
 
 
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• Subtask 1: 6 / 6
• Subtask 2: 0 / 7
• Subtask 3: 16 / 16
• Subtask 4: 0 / 17
• Subtask 5: 26 / 26
• Subtask 6: 0 / 28