結果
| 問題 | No.1050 Zero (Maximum) | 
| コンテスト | |
| ユーザー |  silviasetitech | 
| 提出日時 | 2020-05-10 10:29:36 | 
| 言語 | Java (openjdk 23) | 
| 結果 | 
                                AC
                                 
                             | 
| 実行時間 | 248 ms / 2,000 ms | 
| コード長 | 3,044 bytes | 
| コンパイル時間 | 1,786 ms | 
| コンパイル使用メモリ | 79,332 KB | 
| 実行使用メモリ | 58,072 KB | 
| 最終ジャッジ日時 | 2024-07-07 06:12:07 | 
| 合計ジャッジ時間 | 5,319 ms | 
| ジャッジサーバーID (参考情報) | judge5 / judge2 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 3 | 
| other | AC * 15 | 
ソースコード
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Scanner;
/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author silviase
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        No1050ZeroMaximum solver = new No1050ZeroMaximum();
        solver.solve(1, in, out);
        out.close();
    }
    static class No1050ZeroMaximum {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            final int MOD = (int) 1e9 + 7;
            int m = in.nextInt();
            int k = in.nextInt();
            // 最右項, 始めは1,0,0,0...0
            long[][] res = new long[m][1];
            res[0][0] = 1;
            // i->jに行く組み合わせ.addがあるので全て1からスタートする.
            long[][] mt = new long[m][m];
            ArrayUtil.fill(mt, 1);
            for (int from = 0; from < m; from++) {
                for (int mul = 0; mul < m; mul++) {
                    mt[from][(from * mul) % m]++;
                }
            }
            Matrix ans = Matrix.mul(Matrix.pow(new Matrix(mt), k, MOD), new Matrix(res), MOD);
            out.println(ans.m[0][0]);
        }
    }
    static class ArrayUtil {
        public static void fill(long[][] array, long val) {
            for (long[] a : array) Arrays.fill(a, val);
        }
    }
    static class Matrix {
        public long[][] m;
        public int h;
        public int w;
        public Matrix(int h, int w, long[][] m) {
            this.h = h;
            this.w = w;
            this.m = m;
        }
        public Matrix(long[][] m) {
            this.m = m;
            this.h = m.length;
            this.w = m[0].length;
        }
        public static Matrix identity(int n) {
            long[][] mat = new long[n][n];
            for (int i = 0; i < n; i++) {
                mat[i][i] = 1;
            }
            return new Matrix(mat);
        }
        public static Matrix mul(Matrix m1, Matrix m2, long MOD) {
            long[][] res = new long[m1.h][m2.w];
            long[][] mat1 = m1.m;
            long[][] mat2 = m2.m;
            for (int h = 0; h < m1.h; h++) {
                for (int w = 0; w < m2.w; w++) {
                    for (int x = 0; x < m1.w; x++) {
                        res[h][w] += mat1[h][x] * mat2[x][w];
                        res[h][w] %= MOD;
                    }
                }
            }
            return new Matrix(res);
        }
        public static Matrix pow(Matrix m, long a, long MOD) {
            if (a == 0) return identity(m.h);
            Matrix half = pow(m, a / 2, MOD);
            return mul(mul(half, half, MOD), a % 2 == 0 ? identity(m.h) : m, MOD);
        }
    }
}
            
            
            
        