Submission #2392

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
2392	2013-07-21 05:23:54	hgp744	지우개 (GA4_eraser)	C++98	46 / 100	1000 ms	2448 KiB

eraser

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
#include<stdio.h>
long long int d[100001], f[100002];
int main()
{
 int n, i, j, k, a, max=0;
 long long int z, ans=0;
 scanf("%d", &n);
 for(i=1;i<=n;i++){
  scanf("%d", &a);
  d[a]+=a;
  if(max<a) max = a;
 }
 for(i=max;i>=1;i--) f[i] = f[i+1]+d[i];
 for(i=1;i<=max-2;i++){
  if(d[i]==0) continue;
  for(j=i+1;j<max;j++){
   if(d[j]==0) continue;
   z = (f[j+1]*d[j])%1000000007;
   z = (z*d[i])%1000000007;
   ans = (ans+z)%1000000007;
  }
 }
 printf("%lld", ans);
 return 0;
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 16 / 16
• Subtask 4: 17 / 17
• Subtask 5: 0 / 26
• Subtask 6: 0 / 28