Luzhiled's Library

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:heavy_check_mark: test/verify/aoj-2286.test.cpp

Depends on

Code

#define PROBLEM "http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=2286"

#include "../../template/template.hpp"

#include "../../math/number-theory/euler-phi-table.hpp"

int main() {
  const int MAX_N = 1000000;
  auto phi = euler_phi_table(MAX_N);
  vector< int64_t > S(MAX_N + 1);
  S[1] = 2;
  for(int i = 2; i <= MAX_N; i++) {
    S[i] = S[i - 1] + phi[i];
  }
  int T;
  cin >> T;
  while(T--) {
    int N;
    cin >> N;
    cout << S[N] << "\n";
  }
}
#line 1 "test/verify/aoj-2286.test.cpp"
#define PROBLEM "http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=2286"

#line 1 "template/template.hpp"
#include<bits/stdc++.h>

using namespace std;

using int64 = long long;
const int mod = 1e9 + 7;

const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    cerr << fixed << setprecision(10);
  }
} iosetup;

template< typename T1, typename T2 >
ostream &operator<<(ostream &os, const pair< T1, T2 >& p) {
  os << p.first << " " << p.second;
  return os;
}

template< typename T1, typename T2 >
istream &operator>>(istream &is, pair< T1, T2 > &p) {
  is >> p.first >> p.second;
  return is;
}

template< typename T >
ostream &operator<<(ostream &os, const vector< T > &v) {
  for(int i = 0; i < (int) v.size(); i++) {
    os << v[i] << (i + 1 != v.size() ? " " : "");
  }
  return os;
}

template< typename T >
istream &operator>>(istream &is, vector< T > &v) {
  for(T &in : v) is >> in;
  return is;
}

template< typename T1, typename T2 >
inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }

template< typename T1, typename T2 >
inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }

template< typename T = int64 >
vector< T > make_v(size_t a) {
  return vector< T >(a);
}

template< typename T, typename... Ts >
auto make_v(size_t a, Ts... ts) {
  return vector< decltype(make_v< T >(ts...)) >(a, make_v< T >(ts...));
}

template< typename T, typename V >
typename enable_if< is_class< T >::value == 0 >::type fill_v(T &t, const V &v) {
  t = v;
}

template< typename T, typename V >
typename enable_if< is_class< T >::value != 0 >::type fill_v(T &t, const V &v) {
  for(auto &e : t) fill_v(e, v);
}

template< typename F >
struct FixPoint : F {
  explicit FixPoint(F &&f) : F(forward< F >(f)) {}

  template< typename... Args >
  decltype(auto) operator()(Args &&... args) const {
    return F::operator()(*this, forward< Args >(args)...);
  }
};
 
template< typename F >
inline decltype(auto) MFP(F &&f) {
  return FixPoint< F >{forward< F >(f)};
}
#line 4 "test/verify/aoj-2286.test.cpp"

#line 1 "math/number-theory/euler-phi-table.hpp"
/**
 * @brief Euler’s Phi Table(オイラーのφ関数テーブル)
 * @docs docs/euler-phi-table.md
 */
vector< int > euler_phi_table(int n) {
  vector< int > euler(n + 1);
  for(int i = 0; i <= n; i++) {
    euler[i] = i;
  }
  for(int i = 2; i <= n; i++) {
    if(euler[i] == i) {
      for(int j = i; j <= n; j += i) {
        euler[j] = euler[j] / i * (i - 1);
      }
    }
  }
  return euler;
}
#line 6 "test/verify/aoj-2286.test.cpp"

int main() {
  const int MAX_N = 1000000;
  auto phi = euler_phi_table(MAX_N);
  vector< int64_t > S(MAX_N + 1);
  S[1] = 2;
  for(int i = 2; i <= MAX_N; i++) {
    S[i] = S[i - 1] + phi[i];
  }
  int T;
  cin >> T;
  while(T--) {
    int N;
    cin >> N;
    cout << S[N] << "\n";
  }
}
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