// #define DEBUGGING #include #define endl '\n' #define ALL(V) begin(V), end(V) #define ALLR(V) rbegin(V), rend(V) using ll = std::int64_t; using ull = std::uint64_t; using PLL = std::pair; using TLL = std::tuple; template using V = std::vector; template using VV = V>; template const T& var_min(const T &t) { return t; } template const T& var_max(const T &t) { return t; } template const T& var_min(const T &t, const Tail&... tail) { return std::min(t, var_min(tail...)); } template const T& var_max(const T &t, const Tail&... tail) { return std::max(t, var_max(tail...)); } template void chmin(T &t, const Tail&... tail) { t = var_min(t, tail...); } template void chmax(T &t, const Tail&... tail) { t = var_max(t, tail...); } template const T& clamp(const T &t, const T &low, const T &high) { return std::max(low, std::min(high, t)); } template void chclamp(T &t, const T &low, const T &high) { return t = clamp(t, low, high); } namespace init__ { struct InitIO { InitIO() { std::cin.tie(nullptr); std::ios_base::sync_with_stdio(false); std::cout << std::fixed << std::setprecision(30); } } init_io; } #define mv_rec make_v(init, tail...) template T make_v(T init) { return init; } template auto make_v(T init, size_t s, Tail... tail) { return V(s, mv_rec); } #undef mv_rec using namespace std; #ifdef DEBUGGING #include "../../debug/debug.cpp" #else #define DEBUG(...) 0 #define DEBUG_SEPARATOR_LINE 0 #endif template class SegmentTree { public: ll size; vector node; function comp; T identity_ele; //comp(x, identity_ele) == x SegmentTree(const vector &v, function comp, T identity_ele) : comp(comp), identity_ele(identity_ele) { ll tmp = 1; while (tmp < v.size()) tmp = (tmp << 1); this->size = tmp; this->identity_ele = identity_ele; this->comp = comp; node = V(2 * size - 1, identity_ele); for (ll i = 0; i < v.size(); i++) { node[i + size - 1] = v[i]; } for (ll i = size - 2; 0 <= i; i--) { node[i] = comp(node[i * 2 + 1], node[i * 2 + 2]); } } void update(ll pos, T value) { pos += size - 1; node[pos] = value; while (pos > 0) { pos = (pos - 1) / 2; node[pos] = comp(node[2 * pos + 1], node[2 * pos + 2]); } } T query(ll a, ll b) { return sub_query(a, b, 0, 0, size); } T sub_query(ll a, ll b, ll k, ll l, ll r) { if (r <= a || b <= l) { return identity_ele; } else if (a <= l && r <= b) { return node[k]; } else { T left = sub_query(a, b, k * 2 + 1, l, (l + r) / 2); T right = sub_query(a, b, k * 2 + 2, (l + r) / 2, r); return comp(left, right); } } }; const ll mod = 1e9 + 7; int main() { ll N; cin >> N; V A(N); for (ll &e : A) cin >> e; V ord(N); iota(ALL(ord), 0ll); sort(ALL(ord), [&](ll i, ll j) { if (A[i] != A[j]) return A[i] > A[j]; else return i < j; }); // len, perm SegmentTree seg(V(N + 10, PLL(0, 0)), [&](PLL p, PLL q) { ll a, b, c, d; tie(a, b) = p; tie(c, d) = q; if (a == c) return PLL(a, (b + d) % mod); else if (a < c) return q; else return p; }, PLL(0, 0)); for (ll idx : ord) { auto q = seg.query(idx, N + 10); if (q.first == 0) { PLL arg(1, 1); seg.update(idx, arg); } else { q.first++; seg.update(idx, q); } } cout << seg.query(0, N + 10).second << endl; return 0; }