結果
| 問題 |
No.644 G L C C D M
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2018-04-08 14:52:35 |
| 言語 | Java (openjdk 23) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 2,861 bytes |
| コンパイル時間 | 2,281 ms |
| コンパイル使用メモリ | 78,284 KB |
| 実行使用メモリ | 53,544 KB |
| 最終ジャッジ日時 | 2024-06-26 20:21:15 |
| 合計ジャッジ時間 | 4,618 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 |
|---|---|
| other | AC * 17 WA * 10 |
ソースコード
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.NoSuchElementException;
public class Main implements Runnable {
public static void main(String[] args) {
new Thread(null, new Main(), "", Runtime.getRuntime().maxMemory()).start();
}
final long mod = 1_000_000_000 + 7;
public void run() {
Scanner sc = new Scanner();
int n = sc.nextInt();
int m = sc.nextInt();
if (m >= n) {
System.out.println(0);
return;
}
int x = n / m;
long[] f = new long[x + 1];
for (int i = 1; i < f.length; ++i)
f[i] = i;
for (int i = 2; i < f.length; ++i) {
if (f[i] == i) {
for (int j = 2 * i; j < f.length; j += i) {
f[j] = f[j] * (i - 1) / i;
}
}
}
long fac = 1;
for (int i = 2; i <= n - 2; ++i)
fac = fac * i % mod;
long ans = f[x] * (f[x] - 1) % mod * fac % mod;
System.out.println(ans);
}
class Scanner {
private final InputStream in = System.in;
private final byte[] buffer = new byte[1024];
private int ptr = 0;
private int buflen = 0;
private boolean hasNextByte() {
if (ptr < buflen) {
return true;
} else {
ptr = 0;
try {
buflen = in.read(buffer);
} catch (IOException e) {
e.printStackTrace();
}
if (buflen <= 0) {
return false;
}
}
return true;
}
private int readByte() {
if (hasNextByte())
return buffer[ptr++];
else
return -1;
}
private boolean isPrintableChar(int c) {
return 33 <= c && c <= 126;
}
public boolean hasNext() {
while (hasNextByte() && !isPrintableChar(buffer[ptr]))
ptr++;
return hasNextByte();
}
public String next() {
if (!hasNext())
throw new NoSuchElementException();
StringBuilder sb = new StringBuilder();
int b = readByte();
while (isPrintableChar(b)) {
sb.appendCodePoint(b);
b = readByte();
}
return sb.toString();
}
public long nextLong() {
if (!hasNext())
throw new NoSuchElementException();
long n = 0;
boolean minus = false;
int b = readByte();
if (b == '-') {
minus = true;
b = readByte();
}
if (b < '0' || '9' < b) {
throw new NumberFormatException();
}
while (true) {
if ('0' <= b && b <= '9') {
n *= 10;
n += b - '0';
} else if (b == -1 || !isPrintableChar(b)) {
return minus ? -n : n;
} else {
throw new NumberFormatException();
}
b = readByte();
}
}
public int nextInt() {
long nl = nextLong();
if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
throw new NumberFormatException();
return (int) nl;
}
public double nextDouble() {
return Double.parseDouble(next());
}
}
static void tr(Object... objects) {
System.out.println(Arrays.deepToString(objects));
}
}