結果

問題 No.1136 Four Points Tour
ユーザー firiexp
提出日時 2020-11-28 17:09:30
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
CE  
(最新)
AC  
(最初)
実行時間 -
コード長 4,948 bytes
コンパイル時間 1,007 ms
コンパイル使用メモリ 89,396 KB
最終ジャッジ日時 2025-01-16 09:27:52
ジャッジサーバーID
（参考情報） 		judge5 / judge5
このコードへのチャレンジ
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コンパイルエラー時のメッセージ・ソースコードは、提出者また管理者しか表示できないようにしております。（リジャッジ後のコンパイルエラーは公開されます）
ただし、clay言語の場合は開発者のデバッグのため、公開されます。

コンパイルメッセージ
main.cpp: In instantiation of ‘struct SquareMatrix<SemiRing, 2>’:
main.cpp:141:9:   required from here
main.cpp:54:9: error: ‘SquareMatrix<H, SIZE>::A’ has incomplete type
   54 |     mat A;
      |         ^
In file included from /usr/include/c++/13/bits/memory_resource.h:47,
                 from /usr/include/c++/13/string:58,
                 from /usr/include/c++/13/bits/locale_classes.h:40,
                 from /usr/include/c++/13/bits/ios_base.h:41,
                 from /usr/include/c++/13/ios:44,
                 from /usr/include/c++/13/ostream:40,
                 from /usr/include/c++/13/iostream:41,
                 from main.cpp:1:
/usr/include/c++/13/tuple:2019:45: note: declaration of ‘using SquareMatrix<SemiRing, 2>::mat = struct std::array<std::array<modint<1000000007>, 2>, 2>’ {aka ‘struct std::array<std::array<modint<1000000007>, 2>, 2>’}
 2019 |   template<typename _Tp, size_t _Nm> struct array;
      |                                             ^~~~~
main.cpp: In function ‘int main()’:
main.cpp:142:8: error: variable ‘ar x’ has initializer but incomplete type
  142 |     ar x = {1, 0};
      |        ^
main.cpp:143:9: error: no match for ‘operator[]’ (operand types are ‘SquareMatrix<SemiRing, 2>::ar’ {aka ‘std::array<modint<1000000007>, 2>’} and ‘int’)
  143 |     A[1][0] = 1; A[0][1] = 3; A[1][1] = 2;
      |         ^
main.cpp:143:22: error: no match for ‘operator[]’ (operand types are ‘SquareMatrix<SemiRing, 2>::ar’ {aka ‘std::array<modint<1000000007>, 2>’} and ‘int’)
  143 |     A[1][0] = 1; A[0][1] = 3; A[1][1] = 2;
      |                      ^
main.cpp:143:35: error: no match for ‘operator[]’ (operand types are ‘SquareMatrix<SemiRing, 2>::ar’ {aka ‘std::array<modint<1000000007>, 2>’} and ‘int’)
  143 |     A[1][0] = 1; A[0][1] = 3; A[1][1] = 2;
      |                                   ^

ソースコード

diff # 

#include <iostream>
#include <algorithm>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <numeric>
#include <bitset>
#include <cmath>

static const int MOD = 1000000007;
using ll = long long;
using u32 = unsigned;
using u64 = unsigned long long;
using namespace std;

template<class T> constexpr T INF = ::numeric_limits<T>::max() / 32 * 15 + 208;

template <u32 M>
struct modint {
    u32 val;
public:
    static modint raw(int v) { modint x; x.val = v; return x; }
    modint() : val(0) {}
    template <class T>
    modint(T v) { ll x = (ll)(v%(ll)(M)); if (x < 0) x += M; val = u32(x); }
    modint(bool v) { val = ((unsigned int)(v) % M); }
    modint& operator++() { val++; if (val == M) val = 0; return *this; }
    modint& operator--() { if (val == 0) val = M; val--; return *this; }
    modint operator++(int) { modint result = *this; ++*this; return result; }
    modint operator--(int) { modint result = *this; --*this; return result; }
    modint& operator+=(const modint& b) { val += b.val; if (val >= M) val -= M; return *this; }
    modint& operator-=(const modint& b) { val -= b.val; if (val >= M) val += M; return *this; }
    modint& operator*=(const modint& b) { u64 z = val; z *= b.val; val = (u32)(z % M); return *this; }
    modint& operator/=(const modint& b) { return *this = *this * b.inv(); }
    modint operator+() const { return *this; }
    modint operator-() const { return modint() - *this; }
    modint pow(long long n) const { modint x = *this, r = 1; while (n) { if (n & 1) r *= x; x *= x; n >>= 1; } return r; }
    modint inv() const { return pow(M-2); }
    friend modint operator+(const modint& a, const modint& b) { return modint(a) += b; }
    friend modint operator-(const modint& a, const modint& b) { return modint(a) -= b; }
    friend modint operator*(const modint& a, const modint& b) { return modint(a) *= b; }
    friend modint operator/(const modint& a, const modint& b) { return modint(a) /= b; }
    friend bool operator==(const modint& a, const modint& b) { return a.val == b.val; }
    friend bool operator!=(const modint& a, const modint& b) { return a.val != b.val; }
};
using mint = modint<MOD>;

template<class H, size_t SIZE>
struct SquareMatrix {
    using T = typename H::T;
    using ar = array<T, SIZE>;
    using mat = array<ar, SIZE>;
    mat A;
    SquareMatrix() = default;
    static SquareMatrix I(){
        SquareMatrix X{};
        for (int i = 0; i < SIZE; ++i) {
            for (int j = 0; j < SIZE; ++j) {
                if(i == j) X[i][j] = H::one();
                else X[i][j] = H::zero();
            }
        }
        return X;
    }

    friend ar operator*=(ar &x, const SquareMatrix &Y) {
        ar ans{};
        for (int i = 0; i < SIZE; ++i) {
            for (int j = 0; j < SIZE; ++j) {
                 H::add(ans[j], H::mul(x[i], Y[i][j]));
            }
        }
        x.swap(ans);
        return x;
    }
    friend ar operator*(ar x, const SquareMatrix &Y) { return x *= Y; }

    inline const ar &operator[](int k) const{ return (A.at(k)); }
    inline ar &operator[](int k) { return (A.at(k)); }
    SquareMatrix &operator+= (const SquareMatrix &B){
        for (int i = 0; i < SIZE; ++i) {
            for (int j = 0; j < SIZE; ++j) {
                H::add((*this)[i][j], B[i][j]);
            }
        }
        return (*this);
    }

    SquareMatrix &operator-= (const SquareMatrix &B){
        for (int i = 0; i < SIZE; ++i) {
            for (int j = 0; j < SIZE; ++j) {
                H::add((*this)[i][j], -B[i][j]);
            }
        }
        return (*this);
    }

    SquareMatrix &operator*=(const SquareMatrix &B) {
        SquareMatrix C{};
        for (int i = 0; i < SIZE; ++i) {
            for (int k = 0; k < SIZE; ++k) {
                for (int j = 0; j < SIZE; ++j) {
                    H::add(C[i][j],  H::mul((*this)[i][k], B[k][j]));
                }
            }
        }
        A.swap(C.A);
        return (*this);
    }

    SquareMatrix pow(ll n) const {
        SquareMatrix a = (*this), res = I();
        while(n > 0){
            if(n & 1) res *= a;
            a *= a;
            n >>= 1;
        }
        return res;
    }
    SquareMatrix operator+(const SquareMatrix &B) const {return SquareMatrix(*this) += B;}
    SquareMatrix operator-(const SquareMatrix &B) const {return SquareMatrix(*this) -= B;}
    SquareMatrix operator*(const SquareMatrix &B) const {return SquareMatrix(*this) *= B;}
};

struct SemiRing {
    using T = mint;
    static inline T mul(T x, T y){ return x * y; }
    static inline void add(T &x, T y){ x += y; }
    static inline T one(){ return 1; }
    static inline T zero(){ return 0; }
};

using ar = array<SemiRing::T, 2>;
using mat = SquareMatrix<SemiRing, 2>;


int main() {
    ll n;
    cin >> n;
    mat A;
    ar x = {1, 0};
    A[1][0] = 1; A[0][1] = 3; A[1][1] = 2;
    x *= A.pow(n);
    cout << x[0].val << "\n";
    return 0;
}
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