結果

問題 No.793 うし数列 2
ユーザー SuunnSuunn
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
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 2
other AC * 21
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 #
プレゼンテーションモードにする

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();
}
}
}
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