Submission #4127

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
4127	2013-09-01 17:33:36	pichulia	지우개 (GA4_eraser)	C++98	100 / 100	16 ms	3040 KiB

eraser

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#include<stdio.h>
#include<algorithm>
#define M 1000000007
using namespace std;
long long int a[100005];
long long int s[100005];
int n, m;
int b[100005];
int main()
{
  long long int i, j, k;
  scanf("%d",&n);
  for(i=0; i<n; i++)
  {
    scanf("%lld",&j);
    b[j]++;
  }
  for(i=1; i<=100000;i++)
  {
    if(b[i]>0)
    {
      a[++m]=(i*b[i])%M;
    }
  }
  for(i=1;i<=m;i++)
    s[i]=(s[i-1]+a[i])%M;
  k=0;
  for(i=1; i<=m; i++)
  {
    j=(s[i-1]*(s[m]-s[i]))%M;
 
 
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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