結果
| 問題 |
No.368 LCM of K-products
|
| コンテスト | |
| ユーザー |
m_tsubasa
|
| 提出日時 | 2020-07-28 22:40:29 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 353 ms / 2,000 ms |
| コード長 | 2,633 bytes |
| コンパイル時間 | 2,458 ms |
| コンパイル使用メモリ | 207,692 KB |
| 最終ジャッジ日時 | 2025-01-12 07:20:40 |
|
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 35 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
template <int mod = (int)(1e9 + 7)>
struct ModInt {
int x;
constexpr ModInt() : x(0) {}
constexpr ModInt(int64_t y)
: x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}
constexpr ModInt &operator+=(const ModInt &p) noexcept {
if ((x += p.x) >= mod) x -= mod;
return *this;
}
constexpr ModInt &operator-=(const ModInt &p) noexcept {
if ((x += mod - p.x) >= mod) x -= mod;
return *this;
}
constexpr ModInt &operator*=(const ModInt &p) noexcept {
x = (int)(1LL * x * p.x % mod);
return *this;
}
constexpr ModInt &operator/=(const ModInt &p) noexcept {
*this *= p.inverse();
return *this;
}
constexpr ModInt operator-() const { return ModInt(-x); }
constexpr ModInt operator+(const ModInt &p) const noexcept {
return ModInt(*this) += p;
}
constexpr ModInt operator-(const ModInt &p) const noexcept {
return ModInt(*this) -= p;
}
constexpr ModInt operator*(const ModInt &p) const noexcept {
return ModInt(*this) *= p;
}
constexpr ModInt operator/(const ModInt &p) const noexcept {
return ModInt(*this) /= p;
}
constexpr bool operator==(const ModInt &p) const noexcept { return x == p.x; }
constexpr bool operator!=(const ModInt &p) const noexcept { return x != p.x; }
constexpr ModInt inverse() const noexcept {
int a = x, b = mod, u = 1, v = 0, t = 0;
while (b > 0) {
t = a / b;
swap(a -= t * b, b);
swap(u -= t * v, v);
}
return ModInt(u);
}
constexpr ModInt pow(int64_t n) const {
ModInt res(1), mul(x);
while (n) {
if (n & 1) res *= mul;
mul *= mul;
n >>= 1;
}
return res;
}
friend constexpr ostream &operator<<(ostream &os, const ModInt &p) noexcept {
return os << p.x;
}
friend constexpr istream &operator>>(istream &is, ModInt &a) noexcept {
int64_t t = 0;
is >> t;
a = ModInt<mod>(t);
return (is);
}
constexpr int get_mod() { return mod; }
};
int n, k;
vector<int> a;
map<int, vector<int>> mp;
int main() {
cin >> n >> k;
a.resize(n);
for (auto &p : a) {
cin >> p;
long long x = p;
for (int long long i = 2; i * i <= x; ++i) {
int cnt = 0;
while (x % i == 0) ++cnt, x /= i;
if (cnt) mp[i].push_back(cnt);
}
if (x != 1) mp[x].push_back(1);
}
ModInt<> res = 1;
for (auto p : mp) {
vector<int> v = p.second;
sort(v.begin(), v.end(), greater<int>());
int len = min(k, (int)v.size()), cnt = 0;
for (int i = 0; i < len; ++i) cnt += v[i];
res *= ModInt<>(p.first).pow(cnt);
}
cout << res << endl;
return 0;
}
m_tsubasa