結果

問題 No.644 G L C C D M
ユーザー yuya178yuya178
提出日時 2018-02-03 00:56:10
言語 Java21
(openjdk 21)
結果
AC  
実行時間 74 ms / 2,000 ms
コード長 3,987 bytes
コンパイル時間 4,571 ms
コンパイル使用メモリ 78,000 KB
実行使用メモリ 52,768 KB
最終ジャッジ日時 2023-08-30 02:34:41
合計ジャッジ時間 7,147 ms
ジャッジサーバーID
(参考情報)
judge12 / judge14
このコードへのチャレンジ
(要ログイン)

テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 59 ms
51,060 KB
testcase_01 AC 60 ms
50,844 KB
testcase_02 AC 59 ms
51,096 KB
testcase_03 AC 60 ms
50,812 KB
testcase_04 AC 59 ms
51,056 KB
testcase_05 AC 74 ms
51,056 KB
testcase_06 AC 59 ms
50,700 KB
testcase_07 AC 59 ms
51,168 KB
testcase_08 AC 60 ms
50,948 KB
testcase_09 AC 59 ms
49,120 KB
testcase_10 AC 61 ms
50,876 KB
testcase_11 AC 61 ms
50,860 KB
testcase_12 AC 61 ms
51,312 KB
testcase_13 AC 61 ms
50,888 KB
testcase_14 AC 59 ms
50,884 KB
testcase_15 AC 58 ms
50,868 KB
testcase_16 AC 61 ms
51,108 KB
testcase_17 AC 65 ms
50,696 KB
testcase_18 AC 64 ms
50,924 KB
testcase_19 AC 73 ms
51,168 KB
testcase_20 AC 60 ms
51,024 KB
testcase_21 AC 60 ms
51,340 KB
testcase_22 AC 69 ms
51,212 KB
testcase_23 AC 65 ms
52,768 KB
testcase_24 AC 65 ms
50,780 KB
testcase_25 AC 65 ms
51,080 KB
testcase_26 AC 64 ms
51,312 KB
権限があれば一括ダウンロードができます

ソースコード

diff #

import java.io.*;
import java.util.*;
import java.math.*;
// import java.awt.Point;
 
public class Main {
    InputStream is;
    PrintWriter out;
    String INPUT = "";
 
    long mod = 1_000_000_007;
    long inf = Long.MAX_VALUE;

    long sum = 0;

    void solve(){
        int n = ni();
        int m = ni();
        long res = 0;
        long[] e = EulerPhi();
        for(int i = 2; i <= n/m; i++){
            res += 2*e[i];
            res %= mod; 
        }
        for(long i = 1; i <= n-2; i++){
            res *= i;
            res %= mod;
        }
        out.println(res);
    }

    long[] EulerPhi(){
        int n = 100001;
        long[] e = new long[n];
        for(int i = 0; i < n; i++) e[i] = i;
        for(int i = 2; i < n; i++){
            if(e[i]==i){
                for(int j = i; j < n; j+=i){
                    e[j] = e[j] / i * (i-1);
                }
            }
        }
        return e;
    }

    void run() throws Exception
    {
        is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
        out = new PrintWriter(System.out);
        long s = System.currentTimeMillis();
        solve();
        out.flush();
        if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
    }
    
    public static void main(String[] args) throws Exception { new Main().run(); }
    
    private byte[] inbuf = new byte[1024];
    private int lenbuf = 0, ptrbuf = 0;
    
    private int readByte()
    {
        if(lenbuf == -1)throw new InputMismatchException();
        if(ptrbuf >= lenbuf){
            ptrbuf = 0;
            try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
            if(lenbuf <= 0)return -1;
        }
        return inbuf[ptrbuf++];
    }
    
    private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
    private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
    
    private double nd() { return Double.parseDouble(ns()); }
    private char nc() { return (char)skip(); }
    
    private String ns()
    {
        int b = skip();
        StringBuilder sb = new StringBuilder();
        while(!(isSpaceChar(b) && b != ' ')){
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    
    private char[] ns(int n)
    {
        char[] buf = new char[n];
        int b = skip(), p = 0;
        while(p < n && !(isSpaceChar(b))){
            buf[p++] = (char)b;
            b = readByte();
        }
        return n == p ? buf : Arrays.copyOf(buf, p);
    }
    
    private char[][] nm(int n, int m)
    {
        char[][] map = new char[n][];
        for(int i = 0;i < n;i++)map[i] = ns(m);
        return map;
    }
    
    private int[] na(int n)
    {
        int[] a = new int[n];
        for(int i = 0;i < n;i++)a[i] = ni();
        return a;
    }
    
    private int ni()
    {
        int num = 0, b;
        boolean minus = false;
        while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
        if(b == '-'){
            minus = true;
            b = readByte();
        }
        
        while(true){
            if(b >= '0' && b <= '9'){
                num = num * 10 + (b - '0');
            }else{
                return minus ? -num : num;
            }
            b = readByte();
        }
    }
    
    private long nl()
    {
        long num = 0;
        int b;
        boolean minus = false;
        while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
        if(b == '-'){
            minus = true;
            b = readByte();
        }
        
        while(true){
            if(b >= '0' && b <= '9'){
                num = num * 10 + (b - '0');
            }else{
                return minus ? -num : num;
            }
            b = readByte();
        }
    }
    
    private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
 
}
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