結果
| 問題 |
No.1666 累乗数
|
| コンテスト | |
| ユーザー |
keijak
|
| 提出日時 | 2021-09-04 02:47:32 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 1,355 ms / 2,000 ms |
| コード長 | 4,380 bytes |
| コンパイル時間 | 6,994 ms |
| コンパイル使用メモリ | 381,896 KB |
| 最終ジャッジ日時 | 2025-01-24 07:34:26 |
|
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 1 |
| other | AC * 19 |
ソースコード
#include <bits/stdc++.h>
#define REP_(i, a_, b_, a, b, ...) \
for (int i = (a), END_##i = (b); i < END_##i; ++i)
#define REP(i, ...) REP_(i, __VA_ARGS__, __VA_ARGS__, 0, __VA_ARGS__)
#define ALL(x) std::begin(x), std::end(x)
using i64 = long long;
template<typename T, typename U>
inline bool chmax(T &a, U b) {
return a < b and ((a = std::move(b)), true);
}
template<typename T, typename U>
inline bool chmin(T &a, U b) {
return a > b and ((a = std::move(b)), true);
}
template<typename T>
inline int ssize(const T &a) {
return (int) std::size(a);
}
template<typename T>
std::istream &operator>>(std::istream &is, std::vector<T> &a) {
for (auto &x: a) is >> x;
return is;
}
template<typename T, typename U>
std::ostream &operator<<(std::ostream &os, const std::pair<T, U> &a) {
return os << "(" << a.first << ", " << a.second << ")";
}
template<typename Container>
std::ostream &print_seq(const Container &a, std::string_view sep = " ",
std::string_view ends = "\n",
std::ostream &os = std::cout) {
auto b = std::begin(a), e = std::end(a);
for (auto it = std::begin(a); it != e; ++it) {
if (it != b) os << sep;
os << *it;
}
return os << ends;
}
template<typename T, typename = void>
struct is_iterable : std::false_type {};
template<typename T>
struct is_iterable<T, std::void_t<decltype(std::begin(std::declval<T>())),
decltype(std::end(std::declval<T>()))>>
: std::true_type {
};
template<typename T, typename = std::enable_if_t<
is_iterable<T>::value &&
!std::is_same<T, std::string_view>::value &&
!std::is_same<T, std::string>::value>>
std::ostream &operator<<(std::ostream &os, const T &a) {
return print_seq(a, ", ", "", (os << "{")) << "}";
}
void print() { std::cout << "\n"; }
template<class T>
void print(const T &x) {
std::cout << x << "\n";
}
template<typename Head, typename... Tail>
void print(const Head &head, Tail... tail) {
std::cout << head << " ";
print(tail...);
}
struct Input {
template<typename T>
operator T() const {
T x;
std::cin >> x;
return x;
}
} in;
#ifdef MY_DEBUG
#include "debug_dump.hpp"
#else
#define DUMP(...)
#endif
using namespace std;
struct PrimeSieve {
std::vector<int> spf; // smallest prime factors table.
std::vector<int> primes;
explicit PrimeSieve(int n) : spf(n + 1) {
// O(n)
for (int i = 2; i <= n; ++i) {
if (spf[i] == 0) {
spf[i] = i;
primes.push_back(i);
}
for (const auto &p: primes) {
if (i * p > n or p > spf[i]) break;
spf[i * p] = p;
}
}
}
inline bool is_prime(int n) const { return spf[n] == n; }
// Möbius function.
int moebius(int n) const {
assert(0 < n and n < int(spf.size()));
int res = 1;
while (n > 1) {
const int p = spf[n];
n /= p;
if (n % p == 0) return 0;
res *= -1;
}
return res;
}
};
template<class F>
i64 bisect(i64 true_x, i64 false_x, F pred) {
static_assert(std::is_invocable_r_v<bool, F, i64>, "F must be: i64 -> bool");
assert(std::max<i64>(true_x, false_x) <= std::numeric_limits<i64>::max() / 2);
// To allow negative values, use floor_div() in the loop.
assert(true_x >= -1 and false_x >= -1);
using u64 = unsigned long long;
while (std::abs(true_x - false_x) > 1) {
i64 mid = ((u64) true_x + (u64) false_x) / 2;
if (pred(mid)) {
true_x = std::move(mid);
} else {
false_x = std::move(mid);
}
}
return true_x;
}
#include <boost/multiprecision/cpp_int.hpp>
using i128 = boost::multiprecision::checked_int128_t;
auto main() -> int {
ios_base::sync_with_stdio(false), cin.tie(nullptr);
const PrimeSieve sieve(64);
auto f = [&](i64 x) -> i64 {
i64 cnt = 0;
for (i64 i = 2; i < 64; ++i) {
const int mu = sieve.moebius(i);
if (mu == 0) continue;
i64 ymax = bisect(1, x + 1, [&](i64 y) -> bool {
i128 yp = 1;
REP(j, i) {
yp *= y;
if (yp > x) return false;
}
return yp <= x;
});
cnt += -mu * (ymax - 1);
}
return cnt + 1;
};
auto solve = [&]() -> i64 {
const i64 K = in;
return bisect(K * K, 0LL, [&](i64 x) {
return f(x) >= K;
});
};
const int t = in;
REP(test_case, t) {
auto ans = solve();
print(ans);
}
}
keijak