This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
using namespace std;
using ll = long long;
const int mod = 1e6 + 7;
const int nmax = 1e4 + 2;
ll dp[2][nmax];
ll a[nmax];
int main()
{
ll n; cin >> n;
ll maxx = 0;
for (int i = 1; i <= n; i++)
{
cin >> a[i];
for (int k = n; k > 0; k--)
{
dp[i%2][k] = dp[(i-1)%2][k-1] + dp[(i-1)%2][k] * k;
// cout << i << ' ' << k << ' ' << dp[i % 2][k] << '\n';
dp[i%2][k] %= mod;
}
dp[i%2][maxx] += a[i] - 1;
dp[i%2][maxx] %= mod;
maxx = max(maxx , a[i]);
}
ll ans = 0;
for (int i = 1; i <= n; i++)
{
ans += dp[n % 2][i];
ans %= mod;
}
cout << (ans + 1) % mod << '\n';
return 0;
}
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