結果
| 問題 |
No.146 試験監督(1)
|
| コンテスト | |
| ユーザー |
kyo1
|
| 提出日時 | 2020-09-14 01:13:37 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 6,122 bytes |
| コンパイル時間 | 2,142 ms |
| コンパイル使用メモリ | 192,068 KB |
| 最終ジャッジ日時 | 2025-01-14 14:40:15 |
|
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 |
|---|---|
| other | WA * 3 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
template <typename T>
T inverse(T a, T m) {
T u = 0, v = 1;
while (a != 0) {
T t = m / a;
m -= t * a;
u -= t * v;
std::swap(a, m);
std::swap(u, v);
}
assert(m == 1);
return u;
}
template <typename T>
class Modular {
public:
using Type = std::decay_t<decltype(T::value)>;
constexpr Modular() : value() {}
template <typename U>
Modular(const U &x) : value(normalize(x)) {}
template <typename U>
Type normalize(const U &x) {
Type v;
if (-mod <= x && x < mod) {
v = static_cast<Type>(x);
} else {
v = static_cast<Type>(x % mod);
}
if (v < 0) v += mod;
return v;
}
const Type &operator()() const { return value; }
template <typename U>
explicit operator U() const {
return static_cast<U>(value);
}
constexpr static Type mod = T::value;
Modular &operator+=(const Modular &rhs) {
if ((value += rhs.value) >= mod) value -= mod;
return *this;
}
Modular &operator-=(const Modular &rhs) {
if ((value -= rhs.value) < 0) value += mod;
return *this;
}
template <typename U>
Modular &operator+=(const U &rhs) {
return *this += Modular(rhs);
}
template <typename U>
Modular &operator-=(const U &rhs) {
return *this -= Modular(rhs);
}
Modular &operator++() { return *this += 1; }
Modular &operator--() { return *this -= 1; }
Modular operator++(int) {
Modular res(*this);
*this += 1;
return res;
}
Modular operator--(int) {
Modular res(*this);
*this -= 1;
return res;
}
template <typename U = T>
std::enable_if_t<std::is_same<typename Modular<U>::Type, int>::value, Modular> &operator*=(
const Modular &rhs) {
value = normalize(static_cast<int64_t>(value) * static_cast<int64_t>(rhs.value));
return *this;
}
template <typename U = T>
std::enable_if_t<std::is_same<typename Modular<U>::Type, int64_t>::value, Modular> &operator*=(
const Modular &rhs) {
value = normalize(static_cast<__int128>(value) * static_cast<__int128>(rhs.value));
return *this;
}
Modular &operator/=(const Modular &rhs) { return *this *= Modular(inverse(rhs.value, mod)); }
template <typename U>
friend bool operator==(const Modular<U> &lhs, const Modular<U> &rhs);
template <typename U>
friend bool operator<(const Modular<U> &lhs, const Modular<U> &rhs);
template <typename U>
friend bool operator>(const Modular<U> &lhs, const Modular<U> &rhs);
template <typename U>
friend std::istream &operator>>(std::istream &stream, Modular<U> &rhs);
template <typename U>
friend std::ostream &operator<<(std::ostream &stream, const Modular<U> &rhs);
private:
Type value;
};
template <typename T>
bool operator==(const Modular<T> &lhs, const Modular<T> &rhs) {
return lhs.value == rhs.value;
}
template <typename T, typename U>
bool operator==(const Modular<T> &lhs, U rhs) {
return lhs == Modular<T>(rhs);
}
template <typename T, typename U>
bool operator==(U lhs, const Modular<T> &rhs) {
return Modular<T>(lhs) == rhs;
}
template <typename T>
bool operator!=(const Modular<T> &lhs, const Modular<T> &rhs) {
return !(lhs == rhs);
}
template <typename T, typename U>
bool operator!=(const Modular<T> &lhs, U rhs) {
return !(lhs == rhs);
}
template <typename T, typename U>
bool operator!=(U lhs, const Modular<T> &rhs) {
return !(lhs == rhs);
}
template <typename T>
bool operator<(const Modular<T> &lhs, const Modular<T> &rhs) {
return lhs.value < rhs.value;
}
template <typename T>
bool operator>(const Modular<T> &lhs, const Modular<T> &rhs) {
return lhs.value > rhs.value;
}
template <typename T>
Modular<T> operator+(const Modular<T> &lhs, const Modular<T> &rhs) {
return Modular<T>(lhs) += rhs;
}
template <typename T, typename U>
Modular<T> operator+(const Modular<T> &lhs, U rhs) {
return Modular<T>(lhs) += rhs;
}
template <typename T, typename U>
Modular<T> operator+(U lhs, const Modular<T> &rhs) {
return Modular<T>(lhs) += rhs;
}
template <typename T>
Modular<T> operator-(const Modular<T> &lhs, const Modular<T> &rhs) {
return Modular<T>(lhs) -= rhs;
}
template <typename T, typename U>
Modular<T> operator-(const Modular<T> &lhs, U rhs) {
return Modular<T>(lhs) -= rhs;
}
template <typename T, typename U>
Modular<T> operator-(U lhs, const Modular<T> &rhs) {
return Modular<T>(lhs) -= rhs;
}
template <typename T>
Modular<T> operator*(const Modular<T> &lhs, const Modular<T> &rhs) {
return Modular<T>(lhs) *= rhs;
}
template <typename T, typename U>
Modular<T> operator*(const Modular<T> &lhs, U rhs) {
return Modular<T>(lhs) *= rhs;
}
template <typename T, typename U>
Modular<T> operator*(U lhs, const Modular<T> &rhs) {
return Modular<T>(lhs) *= rhs;
}
template <typename T>
Modular<T> operator/(const Modular<T> &lhs, const Modular<T> &rhs) {
return Modular<T>(lhs) /= rhs;
}
template <typename T, typename U>
Modular<T> operator/(const Modular<T> &lhs, U rhs) {
return Modular<T>(lhs) /= rhs;
}
template <typename T, typename U>
Modular<T> operator/(U lhs, const Modular<T> &rhs) {
return Modular<T>(lhs) /= rhs;
}
template <typename T, typename U>
Modular<T> pow(const Modular<T> &a, const U &b) {
assert(b >= 0);
Modular<T> x = a, res = 1;
U n = b;
while (n > 0) {
if (n & 1) res *= x;
x *= x;
n >>= 1;
}
return res;
}
template <typename T>
std::istream &operator>>(std::istream &stream, Modular<T> &rhs) {
typename std::common_type<typename Modular<T>::Type, int64_t>::type x;
stream >> x;
rhs = Modular<T>(x);
return stream;
}
template <typename T>
std::ostream &operator<<(std::ostream &stream, const Modular<T> &rhs) {
stream << rhs.value;
return stream;
}
constexpr int mod = 1000000007;
// constexpr int mod = 998244353;
using mint = Modular<std::integral_constant<std::decay_t<decltype(mod)>, mod>>;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int N;
cin >> N;
mint res = 0;
for (int i = 0; i < N; i++) {
int c, d;
cin >> c >> d;
res += ((c + 1) / 2) * static_cast<mint>(d);
}
cout << res << '\n';
return 0;
}
kyo1