Submission #1637

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1637	2013-07-11 11:29:16	ainta	지우개 (GA4_eraser)	C++98	100 / 100	25 ms	1276 KiB

eraser

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#include<stdio.h>
#include<algorithm>
using namespace std;
int w[100001],n,i;
long long c,s,g,res,Mod=1000000007;
int main()
{
  scanf("%d",&n);
  for(i=0;i<n;i++)scanf("%d",&w[i]);
  sort(w,w+n);
  for(i=n-1;i>=0;i--){
    if(i!=n-1 && w[i]!=w[i+1])
    {
      g=(g+s*c*w[i+1])%Mod;
      s=(s+c*w[i+1])%Mod;
      c=0;
    }
    c++;
    res=(res+g*w[i])%Mod;
  }
  printf("%lld\n",res);
}
 
 
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• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 16 / 16
• Subtask 4: 17 / 17
• Subtask 5: 26 / 26
• Subtask 6: 28 / 28