#include<stdio.h>
int mod=1000000007;
long long ar[100001];
int aa[100001];
long long sum1[100001];
long long sum2[100001];
int main()
{
long long s=0;
int n,i,size=0;
scanf("%d",&n);
for(i=1;i<=n;i++){
scanf("%lld",&ar[i]);
aa[(int)ar[i]]++;
}
for(i=1;i<=100000;i++){
if(aa[i])
ar[++size]=i;
}
for(i=1;i<=size;i++){
sum1[i]=( sum1[i-1]+(ar[i]*aa[ar[i]])%mod )%mod;
sum2[i]=( sum2[i-1]+(( (ar[i]*aa[ar[i]])%mod )*( (ar[i]*aa[ar[i]])%mod )%mod);
}
for(i=1;i<=size-2;i++){
s+=aa[(int)ar[i]]*ar[i]*(((((sum1[size]-sum1[i])%mod)*((sum1[size]-sum1[i])%mod)-(sum2[size]-sum2[i]))/2)%mod);
s=s%mod;
}
printf("%lld",s);
}
Compilation message
sequence.cpp: In function 'int main()':
sequence.cpp:26: error: expected `)' before ';' token
