#include // clang-format off using namespace std;constexpr int INF=1001001001;constexpr long long INFll=1001001001001001001;namespace viewer{using s=string;templates f(T i){s S=i==INF||i==INFll?"inf":to_string(i);return s(max(0,3-int(S.size())),' ')+S;} templateauto v(T&x,s&&e)->decltype(cerr<void v(const pair&p,s&&e="\n"){cerr<<"(";v(p.first,", ");v(p.second,")"+e);}templatevoid v(const tuple&t,s&&e="\n"){cerr<<"(";v(get<0>(t),", ");v(get<1>(t),")"+e);}templatevoid v(const tuple&t,s&&e="\n"){cerr<<"(";v(get<0>(t),", ");v(get<1>(t),", ");v(get<2>(t),")"+e);}templatevoid v(const tuple&t,s&&e="\n"){cerr<<"(";v(get<0>(t),", ");v(get<1>(t),", ");v(get<2>(t),", ");v(get<3>(t),")"+e);} templatevoid v(const vector&vx,s);templateauto ve(int,const vector&vx)->decltype(cerr<auto ve(bool,const vector&vx){cerr<<"{\n";for(const T&x:vx)cerr<<" ",v(x,",");cerr<<"}\n";}templatevoid v(const vector&vx,s){ve(0,vx);} templatevoid v(const deque&q,s&&e){v(vector(q.begin(),q.end()),e);}templatevoid v(const set&S,s&&e){v(vector(S.begin(),S.end()),e);}templatevoid v(const multiset&S,s&&e){v(vector(S.begin(),S.end()),e);}templatevoid v(const unordered_set&S,s&&e){v(vector(S.begin(),S.end()),e);} templatevoid v(const priority_queue&p,s&&e){priority_queueq=p;vectorz;while(!q.empty()){z.push_back(q.top());q.pop();}v(z,e);}templatevoid v(const map&m,s&&e){cerr<<"{"<<(m.empty()?"":"\n");for(const auto&kv:m){cerr<<" [";v(kv.first,"");cerr<<"] : ";v(kv.second,"");cerr<<"\n";}cerr<<"}"+e;} templatevoid _view(int n,s&S,T&var){cerr<<"\033[1;32m"<void grid(T _){}void grid(const vector>&vvb){cerr<<"\n";for(const vector&vb:vvb){for(const bool&b:vb)cerr<<(b?".":"#");cerr<<"\n";}} void _debug(int,s){}templatevoid _debug(int n,s S,const H&h,const T&... t){int i=0,cnt=0;for(;iap;mint re=a;for(long long r=1;r vector coordinate_compression(const vector As) { vector Bs = As; sort(Bs.begin(), Bs.end()); Bs.erase(unique(Bs.begin(), Bs.end()), Bs.end()); vector ret(As.size()); for (int i = 0; i < (int)As.size(); ++i) { ret[i] = lower_bound(Bs.begin(), Bs.end(), As[i]) - Bs.begin(); } return ret; } template struct fenwick_tree { fenwick_tree() : _n(0) {} explicit fenwick_tree(int n) : _n(n), data(n) {} explicit fenwick_tree(vector& As) : _n(As.size()), data(As) {} // A[idx]+=x void add(int idx, T x) { assert(0 <= idx && idx < _n); idx++; while (idx <= _n) { data[idx - 1] += x; idx += idx & -idx; } } // Σ_[l,r) T sum(int l, int r) const { assert(0 <= l && l <= r && r <= _n); return _sum(r) - _sum(l); } // Σ_[0,r) T sum(int r) const { assert(0 <= r && r <= _n); return _sum(r); } // A[idx] O(logN) T get(int idx) const { assert(0 <= idx && idx < _n); return sum(idx, idx + 1); } // debug vector state() const { vector ret(_n); for (int i = 0; i < _n; i++) ret[i] = get(i); return ret; } inline T operator[](int idx) const { return get(idx); } private: int _n; vector data; T _sum(int r) const { T s = 0; while (r > 0) s += data[r - 1], r -= r & -r; return s; } }; int main() { cin.tie(0); ios::sync_with_stdio(false); int N; cin >> N; vector As(N); for (int i = 0; i < N; i++) { cin >> As[i]; } vector Bs = coordinate_compression(As); vector left_large(N); vector left_pair(N); vector right_small(N); vector right_pair(N); fenwick_tree left_ft(N); fenwick_tree left_ft2(N); for (int i = 0; i < N; i++) { left_pair[i] = left_ft2.sum(Bs[i] + 1, N); left_ft2.add(Bs[i], left_ft.sum(Bs[i] + 1, N)); left_large[i] += left_ft.sum(Bs[i] + 1, N); left_ft.add(Bs[i], 1); } fenwick_tree right_ft(N); fenwick_tree right_ft2(N); for (int i = N - 1; i >= 0; i--) { right_pair[i] = right_ft2.sum(Bs[i]); right_ft2.add(Bs[i], right_ft.sum(Bs[i])); right_small[i] += right_ft.sum(Bs[i]); right_ft.add(Bs[i], 1); } debug(left_large, left_pair, right_small, right_pair); mint ans = 0; for (int i = 0; i < N; i++) { mint coef = 0; coef += left_pair[i]; coef += right_pair[i]; coef += mint(1) * left_large[i] * right_small[i]; debug(coef); ans += coef * As[i]; } cout << ans << endl; return 0; }