#include <stdio.h>
#include <algorithm>
using namespace std;
const int MAXN = 100000;
const long long int mod = 1000000007;
long long int data[MAXN + 1];
long long int data2[MAXN + 1];
long long int sum[MAXN + 1];
long long int sum2[MAXN + 1];
int main ()
{
int n;
scanf ("%d", &n);
for (int i = 0; i < n; ++i)
{
scanf ("%lld", &data[i]);
}
sort (data, data + n);
sum[0] = data[0];
for (int i = 1; i < n; ++i)
{
sum[i] = (sum[i - 1] + data[i]) % mod;
if (sum[i] < 0)
sum += mod;
}
for (int i = 0; i < n - 1; ++i)
{
if (data[i] == data[i + 1])
continue;
else
{
long long int r;
int s;
r = ((sum[n - 1] - sum[i]) * data[i]) % mod;
if (r < 0)
r += mod;
s = i;
while (s >= 0)
{
if (data[s] != data[i])
break;
data2[s] = r;
--s;
}
}
}
sum2[0] = data2[0];
for (int i = 1; i < n - 1; ++i)
{
sum2[i] = (sum2[i - 1] + data2[i]) % mod;
if (sum2[i] < 0)
sum2[i] += mod;
}
long long int sol = 0;
for (int i = 0; i < n - 2; ++i)
{
if (data[i] == data[i + 1])
continue;
else
{
long long int r;
int s;
r = ((sum2[n - 2] - sum2[i]) * data[i]) % mod;
if (r < 0)
r += mod;
s = i;
while (s >= 0)
{
if (data[s] != data[i])
break;
sol = (sol + r) % mod;
if (sol < 0)
sol += mod;
--s;
}
}
}
printf ("%lld", sol);
return 0;
}
Compilation message
sequence.cpp: In function 'int main()':
sequence.cpp:32: error: incompatible types in assignment of 'const long long int' to 'long long int [100001]'
