結果

問題 No.1340 おーじ君をさがせ
ユーザー firiexp
提出日時 2021-01-15 21:59:53
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 3,324 bytes
コンパイル時間 910 ms
コンパイル使用メモリ 90,052 KB
最終ジャッジ日時 2025-01-17 19:21:54
ジャッジサーバーID
（参考情報） 		judge5 / judge2
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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, 100>’:
main.cpp:111:9:   required from here
main.cpp:24:9: error: ‘SquareMatrix<H, SIZE>::A’ has incomplete type
   24 |     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, 100>::mat = struct std::array<std::array<bool, 100>, 100>’ {aka ‘struct std::array<std::array<bool, 100>, 100>’}
 2019 |   template<typename _Tp, size_t _Nm> struct array;
      |                                             ^~~~~
main.cpp: In function ‘int main()’:
main.cpp:115:13: error: no match for ‘operator[]’ (operand types are ‘SquareMatrix<SemiRing, 100>::ar’ {aka ‘std::array<bool, 100>’} and ‘int’)
  115 |         X[a][b] = true;
      |             ^
main.cpp:117:8: error: variable ‘ar p’ has initializer but incomplete type
  117 |     ar p{};
      |        ^
main.cpp:114:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  114 |         scanf("%d %d", &a, &b);
      |         ~~~~~^~~~~~~~~~~~~~~~~

ソースコード

diff #
プレゼンテーションモードにする

#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<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 = bool;
    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 true; }
    static inline T zero(){ return false; }
};
using ar = array<SemiRing::T, 100>;
using mat = SquareMatrix<SemiRing, 100>;
int main() {
    int n, m, t;
    cin >> n >> m >> t;
    mat X;
    for (int i = 0; i < m; ++i) {
        int a, b;
        scanf("%d %d", &a, &b);
        X[a][b] = true;
    }
    ar p{};
    p[0] = true;
    p *= X.pow(t);
    int ans = 0;
    for (int i = 0; i < n; ++i) {
        ans += p[i];
    }
    cout << ans << "\n";
    return 0;
}
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