#line 1 "main.cpp" /** * @title Template */ #include #include #include #include #include #include #include #line 2 "/Users/kodamankod/Desktop/Programming/Library/other/chmin_chmax.cpp" template constexpr bool chmin(T &lhs, const U &rhs) { if (lhs > rhs) { lhs = rhs; return true; } return false; } template constexpr bool chmax(T &lhs, const U &rhs) { if (lhs < rhs) { lhs = rhs; return true; } return false; } /** * @title Chmin/Chmax */ #line 2 "/Users/kodamankod/Desktop/Programming/Library/other/range.cpp" #line 4 "/Users/kodamankod/Desktop/Programming/Library/other/range.cpp" class range { public: class iterator { private: int64_t M_position; public: constexpr iterator(int64_t position) noexcept: M_position(position) { } constexpr void operator ++ () noexcept { ++M_position; } constexpr bool operator != (iterator other) const noexcept { return M_position != other.M_position; } constexpr int64_t operator * () const noexcept { return M_position; } }; class reverse_iterator { private: int64_t M_position; public: constexpr reverse_iterator(int64_t position) noexcept: M_position(position) { } constexpr void operator ++ () noexcept { --M_position; } constexpr bool operator != (reverse_iterator other) const noexcept { return M_position != other.M_position; } constexpr int64_t operator * () const noexcept { return M_position; } }; private: const iterator M_first, M_last; public: constexpr range(int64_t first, int64_t last) noexcept: M_first(first), M_last(std::max(first, last)) { } constexpr iterator begin() const noexcept { return M_first; } constexpr iterator end() const noexcept { return M_last; } constexpr reverse_iterator rbegin() const noexcept { return reverse_iterator(*M_last - 1); } constexpr reverse_iterator rend() const noexcept { return reverse_iterator(*M_first - 1); } }; /** * @title Range */ #line 2 "/Users/kodamankod/Desktop/Programming/Library/other/rev.cpp" #include #include #line 6 "/Users/kodamankod/Desktop/Programming/Library/other/rev.cpp" template class rev_impl { public: using iterator = decltype(std::rbegin(std::declval())); private: const iterator M_begin; const iterator M_end; public: constexpr rev_impl(T &&cont) noexcept: M_begin(std::rbegin(cont)), M_end(std::rend(cont)) { } constexpr iterator begin() const noexcept { return M_begin; } constexpr iterator end() const noexcept { return M_end; } }; template constexpr decltype(auto) rev(T &&cont) { return rev_impl(std::forward(cont)); } /** * @title Reverser */ #line 2 "/Users/kodamankod/Desktop/Programming/Library/algebraic/modular.cpp" #include #line 5 "/Users/kodamankod/Desktop/Programming/Library/algebraic/modular.cpp" template class modular { public: using value_type = uint32_t; using cover_type = uint64_t; static constexpr value_type mod() { return Modulus::value(); } template static constexpr value_type normalize(T value_) noexcept { if (value_ < 0) { value_ = -value_; value_ %= mod(); if (value_ == 0) return 0; return mod() - value_; } return value_ % mod(); } private: value_type value; public: constexpr modular() noexcept : value(0) { } template explicit constexpr modular(T value_) noexcept : value(normalize(value_)) { } template explicit constexpr operator T() const noexcept { return static_cast(value); } constexpr value_type get() const noexcept { return value; } constexpr value_type &extract() noexcept { return value; } constexpr modular operator - () const noexcept { return modular(mod() - value); } constexpr modular operator ~ () const noexcept { return inverse(*this); } constexpr modular operator + (const modular &rhs) const noexcept { return modular(*this) += rhs; } constexpr modular& operator += (const modular &rhs) noexcept { if ((value += rhs.value) >= mod()) value -= mod(); return *this; } constexpr modular operator - (const modular &rhs) const noexcept { return modular(*this) -= rhs; } constexpr modular& operator -= (const modular &rhs) noexcept { if ((value += mod() - rhs.value) >= mod()) value -= mod(); return *this; } constexpr modular operator * (const modular &rhs) const noexcept { return modular(*this) *= rhs; } constexpr modular& operator *= (const modular &rhs) noexcept { value = (cover_type) value * rhs.value % mod(); return *this; } constexpr modular operator / (const modular &rhs) const noexcept { return modular(*this) /= rhs; } constexpr modular& operator /= (const modular &rhs) noexcept { return (*this) *= inverse(rhs); } constexpr bool zero() const noexcept { return value == 0; } constexpr bool operator == (const modular &rhs) const noexcept { return value == rhs.value; } constexpr bool operator != (const modular &rhs) const noexcept { return value != rhs.value; } friend std::ostream& operator << (std::ostream &stream, const modular &rhs) { return stream << rhs.value; } friend constexpr modular inverse(modular val) noexcept { return power(val, mod() - 2); } friend constexpr modular power(modular val, cover_type exp) noexcept { modular res(1); for (; exp > 0; exp >>= 1, val *= val) if (exp & 1) res *= val; return res; } }; template struct modulus_impl { static constexpr uint32_t value() noexcept { return Val; } }; template using mint32_t = modular>; struct runtime_mod { static uint32_t &value() noexcept { static uint32_t val = 0; return val; } }; using rmint32_t = modular; /** * @title Modint */ #line 2 "/Users/kodamankod/Desktop/Programming/Library/algebraic/factorials.cpp" #include #line 5 "/Users/kodamankod/Desktop/Programming/Library/algebraic/factorials.cpp" template class factorials { public: using value_type = T; static constexpr size_t size = N; public: std::array fact{}; std::array fact_inv{}; factorials() { fact.front() = value_type(1); for (size_t i = 1; i <= size; ++i) { fact[i] = fact[i - 1] * value_type(i); } fact_inv.back() = ~fact.back(); for (size_t i = size; i > 0; --i) { fact_inv[i - 1] = fact_inv[i] * value_type(i); } } value_type operator () (size_t n, size_t r) const { return fact[n] * fact_inv[n - r] * fact_inv[r]; } }; /** * @title Factorial */ #line 2 "/Users/kodamankod/Desktop/Programming/Library/container/fenwick_tree.cpp" #line 2 "/Users/kodamankod/Desktop/Programming/Library/other/bit_operation.cpp" #line 5 "/Users/kodamankod/Desktop/Programming/Library/other/bit_operation.cpp" constexpr size_t bit_ppc(const uint64_t x) { return __builtin_popcountll(x); } constexpr size_t bit_ctzr(const uint64_t x) { return x == 0 ? 64 : __builtin_ctzll(x); } constexpr size_t bit_ctzl(const uint64_t x) { return x == 0 ? 64 : __builtin_clzll(x); } constexpr size_t bit_width(const uint64_t x) { return 64 - bit_ctzl(x); } constexpr uint64_t bit_msb(const uint64_t x) { return x == 0 ? 0 : uint64_t(1) << (bit_width(x) - 1); } constexpr uint64_t bit_lsb(const uint64_t x) { return x & (-x); } constexpr uint64_t bit_cover(const uint64_t x) { return x == 0 ? 0 : bit_msb(2 * x - 1); } constexpr uint64_t bit_rev(uint64_t x) { x = ((x >> 1) & 0x5555555555555555) | ((x & 0x5555555555555555) << 1); x = ((x >> 2) & 0x3333333333333333) | ((x & 0x3333333333333333) << 2); x = ((x >> 4) & 0x0F0F0F0F0F0F0F0F) | ((x & 0x0F0F0F0F0F0F0F0F) << 4); x = ((x >> 8) & 0x00FF00FF00FF00FF) | ((x & 0x00FF00FF00FF00FF) << 8); x = ((x >> 16) & 0x0000FFFF0000FFFF) | ((x & 0x0000FFFF0000FFFF) << 16); x = (x >> 32) | (x << 32); return x; } /** * @title Bit Operations */ #line 4 "/Users/kodamankod/Desktop/Programming/Library/container/fenwick_tree.cpp" #line 7 "/Users/kodamankod/Desktop/Programming/Library/container/fenwick_tree.cpp" template class fenwick_tree { public: using value_type = T; using size_type = size_t; private: std::vector M_tree; public: fenwick_tree() = default; explicit fenwick_tree(size_type size) { initialize(size); } void initialize(size_type size) { M_tree.assign(size + 1, value_type{}); } void add(size_type index, const value_type& x) { ++index; while (index <= size()) { M_tree[index] += x; index += bit_lsb(index); } } value_type get(size_type index) const { ++index; value_type res{}; while (index > 0) { res += M_tree[index]; index -= bit_lsb(index); } return res; } value_type fold(size_type l, size_type r) const { if (l == 0 && r == 0) return value_type{}; if (l == 0) return get(r - 1); return get(r - 1) - get(l - 1); } size_type size() const { return M_tree.size() - 1; } }; /** * @title Fenwick Tree */ #line 20 "main.cpp" using i32 = int32_t; using i64 = int64_t; using u32 = uint32_t; using u64 = uint64_t; constexpr i32 inf32 = (i32(1) << 30) - 1; constexpr i64 inf64 = (i64(1) << 62) - 1; using m32 = mint32_t<998244353>; factorials fact; int main() { i32 N; std::cin >> N; std::vector A(N); for (auto &x: A) { std::cin >> x; } auto nums = A; std::sort(nums.begin(), nums.end()); nums.erase(std::unique(nums.begin(), nums.end()), nums.end()); for (auto &x: A) { x = std::lower_bound(nums.begin(), nums.end(), x) - nums.begin(); } i64 inv = 0, sum = 0; { fenwick_tree fen(nums.size()); for (auto i: range(0, N)) { inv += fen.fold(A[i] + 1, nums.size()); fen.add(A[i], 1); } sum = inv; fen.initialize(nums.size()); for (auto i: rev(range(0, N))) { sum += fen.fold(A[i] + 1, nums.size()); fen.add(A[i], 1); } } m32 ans, coeff, prev(1); for (auto i: range(1, N + 1)) { m32 add = m32(sum) * coeff * fact(N - 1, i - 1); if (i > 1) { add += m32(inv) * prev * fact(N - 2, i - 2); } ans = fact(N, i) * ans + add; coeff = coeff * fact(N, i) + prev * fact(N - 1, i - 1); prev *= fact(N, i); } // m32 ans; // std::vector vec(N); // m32 prev(1); // for (auto i: range(1, N + 1)) { // m32 sum; // for (auto j: range(0, N)) { // for (auto k: range(0, N)) { // if (A[k] > A[j]) { // sum += vec[k] * fact(N - 1, i - 1); // if (i > 1 && k < j) { // sum += prev * fact(N - 2, i - 2); // } // } // } // } // ans = fact(N, i) * ans + sum; // for (auto j: range(0, N)) { // vec[j] = vec[j] * fact(N, i) + prev * fact(N - 1, i - 1); // std::cout << vec[j] << ' '; // } // prev *= fact(N, i); // std::cout << '\n'; // } std::cout << ans << '\n'; return 0; }