結果
問題 | No.793 うし数列 2 |
ユーザー |
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提出日時 | 2019-02-22 21:35:52 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 51 ms / 2,000 ms |
コード長 | 3,186 bytes |
コンパイル時間 | 2,071 ms |
コンパイル使用メモリ | 77,168 KB |
実行使用メモリ | 50,024 KB |
最終ジャッジ日時 | 2024-11-25 05:59:34 |
合計ジャッジ時間 | 4,181 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 21 |
ソースコード
import java.io.IOException;import java.util.NoSuchElementException;public class Main{static int mod;public static void main(String[] args){mod = 1000000007;FastScanner sc = new FastScanner();long N = sc.nextLong();long K = 4 * pow(10,N);K = (K+mod-1)%mod;K *= rev(3);System.out.println(K%mod);}private static long rev(int i) {return pow(i,mod-2);}private static long pow(int i, long n) {if(n==0){return 1;}else{if(n%2==0){long val = pow(i,n/2);return val * val % mod;}else{return (pow(i,n-1) * i)%mod;}}}}class FastScanner {private final java.io.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() {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() {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 (int) (minus ? -n : n);}else{throw new NumberFormatException();}b = readByte();}}}