#925242 (C++17) No.2527 H and W

• 問題: No.2527 H and W
• ユーザー: 👑 Nachia
• 提出日時: 2023-11-03 21:28:59
• 言語: C++17 (gcc 12.3.0 + boost 1.83.0)
• 結果: AC
• 実行時間: 39 ms / 2,000 ms
• コード長: 7,796 bytes
• コンパイル時間: 1,290 ms
• コンパイル使用メモリ: 95,904 KB
• 実行使用メモリ: 19,016 KB
• 最終ジャッジ日時: 2024-09-25 19:13:01
• 合計ジャッジ時間: 3,182 ms
• ジャッジサーバーID （参考情報）: judge3 / judge2

入力	結果	実行時間; 実行使用メモリ
testcase_00	AC	2 ms; 6,812 KB
testcase_01	AC	2 ms; 6,820 KB
testcase_02	AC	39 ms; 18,916 KB
testcase_03	AC	2 ms; 6,940 KB
testcase_04	AC	39 ms; 18,824 KB
testcase_05	AC	37 ms; 18,780 KB
testcase_06	AC	37 ms; 18,860 KB
testcase_07	AC	2 ms; 6,944 KB
testcase_08	AC	38 ms; 18,860 KB
testcase_09	AC	16 ms; 11,040 KB
testcase_10	AC	15 ms; 11,072 KB
testcase_11	AC	38 ms; 18,840 KB
testcase_12	AC	37 ms; 18,816 KB
testcase_13	AC	37 ms; 18,852 KB
testcase_14	AC	37 ms; 18,892 KB
testcase_15	AC	37 ms; 18,848 KB
testcase_16	AC	37 ms; 19,016 KB
testcase_17	AC	38 ms; 18,844 KB
testcase_18	AC	37 ms; 18,860 KB
testcase_19	AC	25 ms; 12,272 KB
testcase_20	AC	25 ms; 12,248 KB
testcase_21	AC	26 ms; 11,028 KB
testcase_22	AC	27 ms; 11,076 KB
testcase_23	AC	26 ms; 11,000 KB
testcase_24	AC	24 ms; 12,920 KB
testcase_25	AC	15 ms; 9,988 KB

ソースコード

#ifdef NACHIA
#define _GLIBCXX_DEBUG
#else
#define NDEBUG
#endif
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <array>
#include <atcoder/modint>

#include <iterator>
#include <functional>

template<class Elem> struct vec;
struct iotai;

template<class Iter>
struct seq_view{
    using Ref = typename std::iterator_traits<Iter>::reference;
    using Elem = typename std::iterator_traits<Iter>::value_type;
    Iter a, b;
    Iter begin() const { return a; }
    Iter end() const { return b; }
    int size() const { return (int)(b-a); }
    seq_view(Iter first, Iter last) : a(first), b(last) {}
    seq_view sort() const { std::sort(a, b); return *this; }
    Ref& operator[](int x){ return *(a+x); }
    template<class F = std::less<Elem>, class ret = vec<int>> ret sorti(F f = F()) const {
        ret x(iotai(0), iotai(size()));
        x().sort([&](int l, int r){ return f(a[l],a[r]); });
        return x;
    }
    template<class ret = vec<Elem>> ret col() const { return ret(begin(), end()); }
    template<class F = std::equal_to<Elem>, class ret = vec<std::pair<Elem, int>>>
    ret rle(F eq = F()) const {
        auto x = ret();
        for(auto& a : (*this)){
            if(x.size() == 0 || !eq(x[-1].first, a)) x.emp(a, 1); else x[-1].second++;
        } return x;
    }
    template<class F> seq_view sort(F f) const { std::sort(a, b, f); return *this; }
    Iter uni() const { return std::unique(a, b); }
    Iter lb(const Elem& x) const { return std::lower_bound(a, b, x); }
    Iter ub(const Elem& x) const { return std::upper_bound(a, b, x); }
    int lbi(const Elem& x) const { return lb(x) - a; }
    int ubi(const Elem& x) const { return ub(x) - a; }
    seq_view bound(const Elem& l, const Elem& r) const { return { lb(l), lb(r) }; }
    template<class F> Iter lb(const Elem& x, F f) const { return std::lower_bound(a, b, x, f); }
    template<class F> Iter ub(const Elem& x, F f) const { return std::upper_bound(a, b, x, f); }
    template<class F> Iter when_true_to_false(F f) const {
        if(a == b) return a;
        return std::lower_bound(a, b, *a,
            [&](const Elem& x, const Elem&){ return f(x); });
    }
    seq_view same(Elem x) const { return { lb(x), ub(x) }; }
    template<class F> auto map(F f) const {
        vec<typename Iter::value_type> r;
        for(auto& x : *this) r.emp(f(x));
        return r;
    }
    Iter max() const { return std::max_element(a, b); }
    Iter min() const { return std::min_element(a, b); }
    seq_view rev() const { std::reverse(a, b); return *this; }
};

struct iotai {
    using i64 = long long;
    using Me = iotai;
    using value_type = i64;
    using iterator_category = std::random_access_iterator_tag;
    using difference_type = ptrdiff_t;
    using pointer = i64*;
    using reference = i64&;
    i64 x;
    iotai(i64 y) : x(y) {}
    i64 operator*() const { return x; }
    std::size_t operator-(Me a) const { return x - a.x; }
    Me& operator++(){ ++x; return *this; }
    Me& operator--(){ --x; return *this; }
    Me operator++(int){ return { (i64)(x++) }; }
    Me operator--(int){ return { (i64)(x--) }; }
    Me operator+(std::size_t a) const { return { (i64)(x+a) }; }
    Me operator-(std::size_t a) const { return { (i64)(x-a) }; }
    Me& operator+=(std::size_t a){ x += a; return *this; }
    Me& operator-=(std::size_t a){ x -= a; return *this; }
    bool operator==(iotai r) const { return x == r.x; }
    static seq_view<iotai> range(i64 l, i64 r){ return { Me{l}, Me{r} }; }
};

template<class Elem>
struct vec {
    using Base = typename std::vector<Elem>;
    using Iter = typename Base::iterator;
    using CIter = typename Base::const_iterator;
    using View = seq_view<Iter>;
    using CView = seq_view<CIter>;

    vec(){}
    explicit vec(int n, const Elem& value = Elem()) : a(0<n?n:0, value) {}
    template <class I2> vec(I2 first, I2 last) : a(first, last) {}
    vec(std::initializer_list<Elem> il) : a(std::move(il)) {}
    vec(Base b) : a(std::move(b)) {}
    operator Base() const { return a; }

    Iter begin(){ return a.begin(); }
    CIter begin() const { return a.begin(); }
    Iter end(){ return a.end(); }
    CIter end() const { return a.end(); }
    int size() const { return a.size(); }
    vec sortunied(){ vec x = *this; x().sort(); x.a.erase(x().uni(), x.end()); return x; }
    //Iter operator()(int x){ return (x < 0 ? a.end() : a.begin()) + x; }
    //CIter operator()(int x) const { return (x < 0 ? a.end() : a.begin()) + x; }
    Iter operator()(int x){ return a.begin() + x; }
    CIter operator()(int x) const { return a.begin() + x; }
    View operator()(int l, int r){ return { (*this)(l), (*this)(r) }; }
    CView operator()(int l, int r) const { return { (*this)(l), (*this)(r) }; }
    View operator()(){ return (*this)(0,size()); }
    CView operator()() const { return (*this)(0,size()); }
    Elem& operator[](int x){ return *((*this)(x)); }
    const Elem& operator[](int x) const { return *((*this)(x)); }
    Base& operator*(){ return a; }
    const Base& operator*() const { return a; }
    vec& push(Elem args){
        a.push_back(std::move(args));
        return *this;
    }
    template<class... Args>
    vec& emp(Args &&... args){
        a.emplace_back(std::forward<Args>(args) ...);
        return *this;
    }
    template<class Range>
    vec& app(Range& x){ for(auto& v : a) emp(v); }
    Elem pop(){
        Elem x = std::move(a.back());
        a.pop_back(); return x;
    }
private: Base a;
};

template<class IStr, class T>
IStr& operator>>(IStr& is, vec<T>& v){ for(auto& x:v){ is >> x; } return is; }

namespace nachia{

template<class Modint>
class Comb{
private:
    static constexpr int MOD = Modint::mod();
    std::vector<Modint> F;
    std::vector<Modint> iF;
public:
    void extend(int newN){
        int prevN = (int)F.size() - 1;
        if(newN >= MOD) newN = MOD - 1;
        if(prevN >= newN) return;
        F.resize(newN+1);
        iF.resize(newN+1);
        for(int i=prevN+1; i<=newN; i++) F[i] = F[i-1] * Modint::raw(i);
        iF[newN] = F[newN].inv();
        for(int i=newN; i>prevN; i--) iF[i-1] = iF[i] * Modint::raw(i);
    }
    Comb(int n = 1){
        F.assign(2, Modint(1));
        iF.assign(2, Modint(1));
        extend(n);
    }
    Modint factorial(int n) const { return F[n]; }
    Modint invFactorial(int n) const { return iF[n]; }
    Modint invOf(int n) const { return iF[n] * F[n-1]; }
    Modint comb(int n, int r) const {
        if(n < 0 || n < r || r < 0) return Modint(0);
        return F[n] * iF[r] * iF[n-r];
    }
    Modint invComb(int n, int r) const {
        if(n < 0 || n < r || r < 0) return Modint(0);
        return iF[n] * F[r] * F[n-r];
    }
    Modint perm(int n, int r) const {
        if(n < 0 || n < r || r < 0) return Modint(0);
        return F[n] * iF[n-r];
    }
    Modint invPerm(int n, int r) const {
        if(n < 0 || n < r || r < 0) return Modint(0);
        return iF[n] * F[n-r];
    }
    Modint operator()(int n, int r) const { return comb(n,r); }
};

} // namespace nachia
using Modint = atcoder::static_modint<998244353>;
using namespace std;
using i64 = long long;
using u64 = unsigned long long;
#define rep(i,n) for(int i=0; i<(int)(n); i++)
const i64 INF = 1001001001001001001;
const char* yn(bool x){ return x ? "Yes" : "No"; }

void testcase(){
    i64 H, W, K; cin >> H >> W >> K;
    auto comb = nachia::Comb<Modint>(H+W+1);
    Modint ans = 0;
    for(i64 h=1; h<=H; h++) if(K%h == 0 && K/h<=W){
        ans += comb(H, h) * comb(W, K/h);
    }
    cout << ans.val() << endl;
}

int main(){
    ios::sync_with_stdio(false); cin.tie(nullptr);
    #ifdef NACHIA
    int T; cin >> T; for(int t=0; t<T; T!=++t?(cout<<'\n'),0:0)
    #endif
    testcase();
    return 0;
}