Submission #31088850

---

Source Code Expand

#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
#define rep(i,s,e) for(i64 (i) = (s);(i) < (e);(i)++)
#define all(x) x.begin(),x.end()
#define STRINGIFY(n) #n
#define TOSTRING(n) STRINGIFY(n)
#define PREFIX "#" TOSTRING(__LINE__) "| "
#define debug(x) \
{ \
  std::cout << PREFIX << #x << " = " << x << std::endl; \
}
std::ostream& output_indent(std::ostream& os, int ind) {
  for(int i = 0; i < ind; i++) os << " ";
  return os;
}
template<class S, class T> std::ostream& operator<<(std::ostream& os, const std::pair<S, T>& p);
template<class T> std::ostream& operator<<(std::ostream& os, const std::vector<T>& v);
template<class S, class T> std::ostream& operator<<(std::ostream& os, const std::pair<S, T>& p) {
  return (os << "(" << p.first << ", " << p.second << ")");
}
template<class T> std::ostream& operator<<(std::ostream& os, const std::vector<T>& v) {
  os << "[";
  for(int i = 0;i < v.size();i++) os << v[i] << ", ";
  return (os << "]");
}
template<class T>
static inline std::vector<T> ndvec(size_t&& n, T val) { return std::vector<T>(n, std::forward<T>(val)); }
template<class... Tail>
static inline auto ndvec(size_t&& n, Tail&&... tail) {
  return std::vector<decltype(ndvec(std::forward<Tail>(tail)...))>(n, ndvec(std::forward<Tail>(tail)...));
}

#include <iostream>
using i64 = long long;
template<i64 M> struct modint { i64 a;
  constexpr modint(const i64 x = 0): a((x%M+M)%M){}
  constexpr i64 value() const { return a; }
  constexpr modint inv() const { return this->pow(M-2); }
  constexpr modint pow(i64 r) const {
    modint ans(1); modint aa = *this;
    while(r) { if(r & 1) ans *= aa; aa *= aa; r >>= 1; }
    return ans;
  }
  constexpr bool operator==(const modint& r) const { return a == r.a; }
  constexpr bool operator!=(const modint& r) const { return a != r.a; }
  constexpr modint& operator=(const i64 r) { a = (r % M + M) % M; return *this; }
  constexpr modint& operator+=(const modint r) { a += r.a; if(a >= M) a -= M; return *this; }
  constexpr modint& operator-=(const modint r) { a -= r.a; if(a < 0) a += M; return *this; }
  constexpr modint& operator*=(const modint r) { a = a * r.a % M; return *this; }
  constexpr modint& operator/=(const modint r) { (*this) *= r.inv(); return *this; }
  constexpr modint operator+(const modint r) const { return modint(*this) += r; }
  constexpr modint operator-(const modint r) const { return modint(*this) -= r; }
  constexpr modint operator-() const { return modint(0) - modint(*this); }
  constexpr modint operator*(const modint r) const { return modint(*this) *= r; }
  constexpr modint operator/(const modint r) const { return modint(*this) /= r; }
  constexpr bool operator!=(const modint r) const { return this->value() != r.value(); }
};

template<const i64 M> std::ostream& operator<<(std::ostream& os, const modint<M>& m) { os << m.value(); return os; }


using fp = modint<998244353>;

#include <bits/stdc++.h>
using namespace std;
using i64 = long long;

template <class T>
void divisor_transform(vector<T> &a) {
    int n = a.size();
    vector<bool> sieve(n, true);
    for (int p = 2; p < n; ++p) {
        if (sieve[p]) {
            for (int k = 1; k * p < n; ++k) {
                sieve[k * p] = false;
                a[k * p] += a[k];
            }
        }
    }
    for (int i = 0; ++i != n;) {
        a[i] += a[0];
    }
}

template <class T>
void inverse_divisor_transform(vector<T> &a) {
    int n = a.size();
    vector<bool> sieve(n, true);
    for (int i = 0; ++i != n;) {
        a[i] -= a[0];
    }
    for (int p = 2; p < n; ++p) {
        if (sieve[p]) {
            for (int k = (n - 1) / p; k != 0; --k) {
                sieve[k * p] = false;
                a[k * p] -= a[k];
            }
        }
    }

}

#include <bits/stdc++.h>
using namespace std;
using i64 = long long;

template <class T>
void multiple_transform(vector<T> &a) {
    int n = a.size();
    vector<bool> sieve(n, true);
    for (int p = 2; p < n; ++p) {
        if (sieve[p]) {
            for (int k = (n - 1) / p; k != 0; --k) {
                sieve[k * p] = false;
                a[k] += a[k * p];
            }
        }
    }
    for (int i = 0; ++i != n;) {
        a[i] += a[0];
    }
}

template <class T>
void inverse_multiple_transform(vector<T> &a) {
    int n = a.size();
    vector<bool> sieve(n, true);
    for (int i = 0; ++i != n;) {
        a[i] -= a[0];
    }
    for (int p = 2; p < n; ++p) {
        if (sieve[p]) {
            for (int k = 1; k * p < n; ++k) {
                sieve[k * p] = false;
                a[k] -= a[k * p];
            }
        }
    }
}

constexpr i64 MAX = 1e6 + 1;

int main() {
  i64 N;
  cin.tie(nullptr);
  std::ios::sync_with_stdio(false);
  cin >> N;
  vector<i64> A(N);
  rep(i,0,N) cin >> A[i];
  vector<fp> S(MAX);

  rep(i,0,N) {
    S[A[i]] += A[i];
  }
  multiple_transform(S);

  rep(g,1,MAX) {
    S[g] = S[g] * S[g];
  }

  inverse_multiple_transform(S);

  fp res;
  rep(g,1,MAX) {
    res += fp(g).inv() * S[g];
  }
  rep(i,0,N) {
    res -= A[i];
  }
  cout << res / fp(2) << endl;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:4:28: warning: unnecessary parentheses in declaration of ‘i’ [-Wparentheses]
    4 | #define rep(i,s,e) for(i64 (i) = (s);(i) < (e);(i)++)
      |                            ^
./Main.cpp:150:3: note: in expansion of macro ‘rep’
  150 |   rep(i,0,N) cin >> A[i];
      |   ^~~
./Main.cpp:4:28: warning: unnecessary parentheses in declaration of ‘i’ [-Wparentheses]
    4 | #define rep(i,s,e) for(i64 (i) = (s);(i) < (e);(i)++)
      |                            ^
./Main.cpp:153:3: note: in expansion of macro ‘rep’
  153 |   rep(i,0,N) {
      |   ^~~
./Main.cpp:4:28: warning: unnecessary parentheses in declaration of ‘g’ [-Wparentheses]
    4 | #define rep(i,s,e) for(i64 (i) = (s);(i) < (e);(i)++)
      |                            ^
./Main.cpp:158:3: note: in expansion of macro ‘rep’
  158 |   rep(g,1,MAX) {
      |   ^~~
./Main.cpp:4:28: warning: unnecessary parentheses in declaration of ‘g’ [-Wparentheses]
    4 | #define rep(i,s,e) for(i64 (i) = (s);(i) < (e);(i)++)
      |                            ^
./Main.cpp:165:3: note: in expansion of macro ‘rep’
  165 |   rep(g,1,MAX) {
      |   ^~~
./Main.cpp:4:28: warning: unnecessary parentheses in declaration of ‘i’ [-Wparentheses]
    4 | #define rep(i,s,e) for(i64 (i) = (s);(i) < (e);(i)++)
      |                            ^
./Main.cpp:168:3: note: in expansion of macro ‘rep’
  168 |   rep(i,0,N) {
      |   ^~~

Judge Result