結果
問題 | No.523 LED |
ユーザー |
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提出日時 | 2017-06-02 23:04:03 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 161 ms / 2,000 ms |
コード長 | 2,287 bytes |
コンパイル時間 | 2,946 ms |
コンパイル使用メモリ | 77,248 KB |
実行使用メモリ | 37,412 KB |
最終ジャッジ日時 | 2024-09-22 02:49:50 |
合計ジャッジ時間 | 5,880 ms |
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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ファイルパターン | 結果 |
---|---|
other | AC * 25 |
ソースコード
import java.io.IOException;import java.io.InputStream;import java.util.NoSuchElementException;public class Main {static FastScanner sc = new FastScanner();static final long MOD = 1000000007;public static void main(String[] args) {long N = sc.nextLong();System.out.println(factorial(2 * N) * power(power(2, N), MOD - 2) % MOD);}static long factorial(long N) {long ans = 1;for(int i=2; i<=N; i++) {ans = ans * i % MOD;}return ans;}static long power(long k, long N) {if(N == 1) {return k;} else if(N%2 == 0) {long a = power(k, N/2);return a * a % MOD;} else {return k * power(k, N-1) % MOD;}}static class FastScanner {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 static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}public boolean hasNext() { skipUnprintable(); 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() {return Long.parseLong(next());}public int nextInt(){return Integer.parseInt(next());}public double nextDouble(){return Double.parseDouble(next());}}}