This documentation is automatically generated by online-judge-tools/verification-helper
// competitive-verifier: PROBLEM https://judge.yosupo.jp/problem/counting_primes
#include "../../template/template.hpp"
#include "../../math/number-theory/prime-count.hpp"
int main() {
int64_t n;
cin >> n;
PrimeCount<> pc;
cout << pc.pi(n) << "\n";
}
#line 1 "test/verify/yosupo-counting-primes.test.cpp"
// competitive-verifier: PROBLEM https://judge.yosupo.jp/problem/counting_primes
#line 1 "template/template.hpp"
#include<bits/stdc++.h>
using namespace std;
using int64 = long long;
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/yosupo-counting-primes.test.cpp"
#line 1 "math/number-theory/kth-root-integer.hpp"
uint64_t kth_root_integer(uint64_t a, int k) {
if(k == 1) return a;
auto check = [&](uint32_t x) {
uint64_t mul = 1;
for(int j = 0; j < k; j++) {
if(__builtin_mul_overflow(mul, x, &mul)) return false;
}
return mul <= a;
};
uint64_t ret = 0;
for(int i = 31; i >= 0; i--) {
if(check(ret | (1u << i))) ret |= 1u << i;
}
return ret;
}
#line 1 "math/number-theory/prime-table.hpp"
/**
* @brief Prime Table(素数テーブル)
*
*/
vector< bool > prime_table(int n) {
vector< bool > prime(n + 1, true);
if(n >= 0) prime[0] = false;
if(n >= 1) prime[1] = false;
for(int i = 2; i * i <= n; i++) {
if(!prime[i]) continue;
for(int j = i * i; j <= n; j += i) {
prime[j] = false;
}
}
return prime;
}
#line 3 "math/number-theory/prime-count.hpp"
/**
* @brief Prime Count(素数の個数)
*/
template< int64_t LIM = 100000000000LL >
struct PrimeCount {
private:
int64_t sq;
vector< bool > prime;
vector< int64_t > prime_sum, primes;
int64_t p2(int64_t x, int64_t y) {
if(x < 4) return 0;
int64_t a = pi(y);
int64_t b = pi(kth_root_integer(x, 2));
if(a >= b) return 0;
int64_t sum = (a - 2) * (a + 1) / 2 - (b - 2) * (b + 1) / 2;
for(int64_t i = a; i < b; i++) sum += pi(x / primes[i]);
return sum;
}
int64_t phi(int64_t m, int64_t n) {
if(m < 1) return 0;
if(n > m) return 1;
if(n < 1) return m;
if(m <= primes[n - 1] * primes[n - 1]) return pi(m) - n + 1;
if(m <= primes[n - 1] * primes[n - 1] * primes[n - 1] && m <= sq) {
int64_t sx = pi(kth_root_integer(m, 2));
int64_t ans = pi(m) - (sx + n - 2) * (sx - n + 1) / 2;
for(int64_t i = n; i < sx; ++i) ans += pi(m / primes[i]);
return ans;
}
return phi(m, n - 1) - phi(m / primes[n - 1], n - 1);
}
public:
PrimeCount() : sq(kth_root_integer(LIM, 2)), prime_sum(sq + 1) {
prime = prime_table(sq);
for(int i = 1; i <= sq; i++) prime_sum[i] = prime_sum[i - 1] + prime[i];
primes.reserve(prime_sum[sq]);
for(int i = 1; i <= sq; i++) if(prime[i]) primes.push_back(i);
}
int64_t pi(int64_t n) {
if(n <= sq) return prime_sum[n];
int64_t m = kth_root_integer(n, 3);
int64_t a = pi(m);
return phi(n, a) + a - 1 - p2(n, m);
}
};
#line 6 "test/verify/yosupo-counting-primes.test.cpp"
int main() {
int64_t n;
cin >> n;
PrimeCount<> pc;
cout << pc.pi(n) << "\n";
}
Env | Name | Status | Elapsed | Memory |
---|---|---|---|---|
g++ | Grothendieck_prime_00 | AC | 9 ms | 6 MB |
g++ | example_00 | AC | 9 ms | 6 MB |
g++ | example_01 | AC | 9 ms | 6 MB |
g++ | max_00 | AC | 218 ms | 6 MB |
g++ | max_01 | AC | 218 ms | 6 MB |
g++ | max_02 | AC | 218 ms | 6 MB |
g++ | max_03 | AC | 218 ms | 6 MB |
g++ | max_04 | AC | 218 ms | 6 MB |
g++ | random_00 | AC | 213 ms | 6 MB |
g++ | random_01 | AC | 127 ms | 6 MB |
g++ | random_02 | AC | 131 ms | 6 MB |
g++ | random_03 | AC | 102 ms | 6 MB |
g++ | random_04 | AC | 53 ms | 6 MB |
g++ | small_00 | AC | 8 ms | 6 MB |
g++ | small_01 | AC | 8 ms | 6 MB |
g++ | small_02 | AC | 9 ms | 6 MB |
g++ | small_03 | AC | 8 ms | 6 MB |
g++ | small_04 | AC | 8 ms | 6 MB |
g++ | small_prime_00 | AC | 8 ms | 6 MB |
g++ | small_prime_01 | AC | 8 ms | 6 MB |
g++ | very_small_00 | AC | 8 ms | 6 MB |
g++ | very_small_01 | AC | 8 ms | 6 MB |
g++ | very_small_02 | AC | 8 ms | 6 MB |
g++ | very_small_03 | AC | 8 ms | 6 MB |
g++ | very_small_04 | AC | 8 ms | 6 MB |
clang++ | Grothendieck_prime_00 | AC | 8 ms | 6 MB |
clang++ | example_00 | AC | 8 ms | 6 MB |
clang++ | example_01 | AC | 8 ms | 6 MB |
clang++ | max_00 | AC | 228 ms | 6 MB |
clang++ | max_01 | AC | 228 ms | 6 MB |
clang++ | max_02 | AC | 227 ms | 6 MB |
clang++ | max_03 | AC | 227 ms | 6 MB |
clang++ | max_04 | AC | 228 ms | 6 MB |
clang++ | random_00 | AC | 228 ms | 6 MB |
clang++ | random_01 | AC | 133 ms | 6 MB |
clang++ | random_02 | AC | 139 ms | 6 MB |
clang++ | random_03 | AC | 108 ms | 6 MB |
clang++ | random_04 | AC | 56 ms | 6 MB |
clang++ | small_00 | AC | 9 ms | 6 MB |
clang++ | small_01 | AC | 8 ms | 6 MB |
clang++ | small_02 | AC | 8 ms | 6 MB |
clang++ | small_03 | AC | 8 ms | 6 MB |
clang++ | small_04 | AC | 9 ms | 6 MB |
clang++ | small_prime_00 | AC | 8 ms | 6 MB |
clang++ | small_prime_01 | AC | 8 ms | 6 MB |
clang++ | very_small_00 | AC | 8 ms | 6 MB |
clang++ | very_small_01 | AC | 8 ms | 6 MB |
clang++ | very_small_02 | AC | 9 ms | 6 MB |
clang++ | very_small_03 | AC | 8 ms | 6 MB |
clang++ | very_small_04 | AC | 8 ms | 6 MB |