#542531 (C++17) No.1201 お菓子配り-4

• 問題: No.1201 お菓子配り-4
• ユーザー: Mister
• 提出日時: 2020-08-28 23:03:34
• 言語: C++17 (gcc 13.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 1,609 ms / 4,000 ms
• コード長: 2,805 bytes
• コンパイル時間: 1,029 ms
• コンパイル使用メモリ: 75,024 KB
• 最終ジャッジ日時: 2025-01-13 19:07:47
• ジャッジサーバーID （参考情報）: judge4 / judge1

ファイルパターン	結果
other	AC * 36

ソースコード

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#include <iostream>
#include <numeric>
#include <vector>
template <int MOD>
struct ModInt {
    using lint = long long;
    int val;
    // constructor
    ModInt(lint v = 0) : val(v % MOD) {
        if (val < 0) val += MOD;
    };
    // unary operator
    ModInt operator+() const { return ModInt(val); }
    ModInt operator-() const { return ModInt(MOD - val); }
    ModInt inv() const { return this->pow(MOD - 2); }
    // arithmetic
    ModInt operator+(const ModInt& x) const { return ModInt(*this) += x; }
    ModInt operator-(const ModInt& x) const { return ModInt(*this) -= x; }
    ModInt operator*(const ModInt& x) const { return ModInt(*this) *= x; }
    ModInt operator/(const ModInt& x) const { return ModInt(*this) /= x; }
    ModInt pow(lint n) const {
        auto x = ModInt(1);
        auto b = *this;
        while (n > 0) {
            if (n & 1) x *= b;
            n >>= 1;
            b *= b;
        }
        return x;
    }
    // compound assignment
    ModInt& operator+=(const ModInt& x) {
        if ((val += x.val) >= MOD) val -= MOD;
        return *this;
    }
    ModInt& operator-=(const ModInt& x) {
        if ((val -= x.val) < 0) val += MOD;
        return *this;
    }
    ModInt& operator*=(const ModInt& x) {
        val = lint(val) * x.val % MOD;
        return *this;
    }
    ModInt& operator/=(const ModInt& x) { return *this *= x.inv(); }
    // compare
    bool operator==(const ModInt& b) const { return val == b.val; }
    bool operator!=(const ModInt& b) const { return val != b.val; }
    bool operator<(const ModInt& b) const { return val < b.val; }
    bool operator<=(const ModInt& b) const { return val <= b.val; }
    bool operator>(const ModInt& b) const { return val > b.val; }
    bool operator>=(const ModInt& b) const { return val >= b.val; }
    // I/O
    friend std::istream& operator>>(std::istream& is, ModInt& x) noexcept {
        lint v;
        is >> v;
        x = v;
        return is;
    }
    friend std::ostream& operator<<(std::ostream& os, const ModInt& x) noexcept { return os << x.val; }
};
constexpr int MOD = 1000000007;
using mint = ModInt<MOD>;
using lint = long long;
void solve() {
    int n, m;
    std::cin >> n >> m;
    std::vector<lint> xs(n), ys(m);
    for (auto& x : xs) std::cin >> x;
    for (auto& y : ys) std::cin >> y;
    mint ans = 0;
    for (auto x : xs) {
        if (x == 0) continue;
        for (auto y : ys) {
            auto g = std::gcd(x, y);
            auto ny = y / g;
            mint sum = mint(y * (y + 1) / 2) * x;
            mint rem = mint(ny * (ny - 1) / 2) * g * g;
            ans += (sum - rem) / y;
        }
    }
    std::cout << ans * 2 << "\n";
}
int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);
    solve();
    return 0;
}
 
 
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