結果
問題 | No.673 カブトムシ |
ユーザー |
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提出日時 | 2021-02-01 22:34:33 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
RE
|
実行時間 | - |
コード長 | 3,749 bytes |
コンパイル時間 | 2,093 ms |
コンパイル使用メモリ | 193,128 KB |
最終ジャッジ日時 | 2025-01-18 10:46:54 |
ジャッジサーバーID (参考情報) |
judge2 / judge4 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 12 RE * 2 |
ソースコード
#include <bits/stdc++.h>using namespace std;#define FOR(i,a,b) for(int i=(a);i<(b);++i)#define REP(i,n) FOR(i,0,n)#define ALL(v) begin(v),end(v)template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }using ll = long long;using pii = pair<int, int>;constexpr ll INF = 1ll<<30;constexpr ll longINF = 1ll<<60;constexpr ll MOD = 1000000007;constexpr bool debug = false;//---------------------------------//template<int M>struct ModInt {static_assert(M > 0);public:using value_type = int;using calc_type = std::int_fast64_t;private:value_type val_;public:constexpr ModInt(calc_type val = 0) : val_(val < 0 ? (val % M + M) % M : val % M) {}constexpr const value_type & val() const noexcept { return val_; }constexpr static decltype(M) mod() noexcept { return M; }explicit constexpr operator bool() const noexcept { return val_; }constexpr bool operator !() const noexcept { return !static_cast<bool>(*this); }constexpr ModInt operator +() const noexcept { return ModInt(*this); }constexpr ModInt operator -() const noexcept { return ModInt(-val_); }constexpr ModInt operator ++(int) noexcept { ModInt res = *this; ++*this; return res; }constexpr ModInt operator --(int) noexcept { ModInt res = *this; --*this; return res; }constexpr ModInt & operator ++() noexcept { val_ = val_ + 1 == M ? 0 : val_ + 1; return *this; }constexpr ModInt & operator --() noexcept { val_ = val_ == 0 ? M - 1 : val_ - 1; return *this; }constexpr ModInt & operator +=(const ModInt & rhs) noexcept { val_ += val_ < M - rhs.val_ ? rhs.val_ : rhs.val_ - M; return *this; }constexpr ModInt & operator -=(const ModInt & rhs) noexcept { val_ += val_ >= rhs.val_ ? -rhs.val_ : M - rhs.val_; return *this; }constexpr ModInt & operator *=(const ModInt & rhs) noexcept { val_ = static_cast<calc_type>(val_) * rhs.val_ % M; return *this; }constexpr ModInt & operator /=(const ModInt & rhs) noexcept { return *this *= rhs.inv(); }friend constexpr ModInt operator +(const ModInt & lhs, const ModInt & rhs) noexcept { return ModInt(lhs) += rhs; }friend constexpr ModInt operator -(const ModInt & lhs, const ModInt & rhs) noexcept { return ModInt(lhs) -= rhs; }friend constexpr ModInt operator *(const ModInt & lhs, const ModInt & rhs) noexcept { return ModInt(lhs) *= rhs; }friend constexpr ModInt operator /(const ModInt & lhs, const ModInt & rhs) noexcept { return ModInt(lhs) /= rhs; }friend constexpr bool operator ==(const ModInt & lhs, const ModInt & rhs) noexcept { return lhs.val_ == rhs.val_; }friend constexpr bool operator !=(const ModInt & lhs, const ModInt & rhs) noexcept { return !(lhs == rhs); }friend std::ostream & operator <<(std::ostream & os, const ModInt & rhs) { return os << rhs.val_; }friend std::istream & operator >>(std::istream & is, ModInt & rhs) { calc_type x; is >> x; rhs = ModInt(x); return is; }constexpr ModInt pow(calc_type n) const noexcept {ModInt res = 1, x = val_;if (n < 0) { x = x.inv(); n = -n; }while (n) { if (n & 1) res *= x; x *= x; n >>= 1; }return res;}constexpr ModInt inv() const noexcept {value_type a = val_, a1 = 1, a2 = 0, b = M, b1 = 0, b2 = 1;while (b > 0) {value_type q = a / b, r = a % b;value_type nb1 = a1 - q * b1, nb2 = a2 - q * b2;a = b; b = r;a1 = b1; b1 = nb1;a2 = b2; b2 = nb2;}assert(a == 1);return a1;}};using mint = ModInt<MOD>;int main() {ll B, C, D;cin >> B >> C >> D;if (C == 1) cout << mint(B) * D << endl;else cout << mint(B) * C * (1 - mint(C).pow(D)) / (1 - C) << endl;}