結果
問題 | No.793 うし数列 2 |
ユーザー |
![]() |
提出日時 | 2019-02-22 21:32:11 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 74 ms / 2,000 ms |
コード長 | 3,245 bytes |
コンパイル時間 | 2,488 ms |
コンパイル使用メモリ | 88,904 KB |
実行使用メモリ | 51,340 KB |
最終ジャッジ日時 | 2024-11-25 05:31:15 |
合計ジャッジ時間 | 4,567 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 21 |
ソースコード
public class Main {private static void solve() {long n = nl();//a[0] = 1, a[n] = a[n-1]*10 + 3//a[n] + 1/3 = 10(a[n] + 1/3)//a[n] = 10^n * 4/3 - 1/3int mod = 1000000000 + 7;long inv3 = invl(3, mod);long e = pow(10, n, mod) * 4 % mod * inv3 % mod + mod - inv3;e %= mod;System.out.println(e);}public static long invl(long a, long mod){long b = mod;long p = 1, q = 0;while(b > 0){long c = a / b;long d;d = a; a = b; b = d % b;d = p; p = q; q = d - c * q;}return p < 0 ? p + mod : p;}public static long pow(long a, long n, long mod){long ret = 1;int x = 63-Long.numberOfLeadingZeros(n);for(;x >= 0;x--){ret = ret * ret % mod;if(n<<~x<0)ret = ret * a % mod;}return ret;}public static void main(String[] args) {new Thread(null, new Runnable() {@Overridepublic void run() {long start = System.currentTimeMillis();String debug = args.length > 0 ? args[0] : null;if (debug != null) {try {is = java.nio.file.Files.newInputStream(java.nio.file.Paths.get(debug));} catch (Exception e) {throw new RuntimeException(e);}}reader = new java.io.BufferedReader(new java.io.InputStreamReader(is), 32768);solve();out.flush();tr((System.currentTimeMillis() - start) + "ms");}}, "", 64000000).start();}private static java.io.InputStream is = System.in;private static java.io.PrintWriter out = new java.io.PrintWriter(System.out);private static java.util.StringTokenizer tokenizer = null;private static java.io.BufferedReader reader;public static String next() {while (tokenizer == null || !tokenizer.hasMoreTokens()) {try {tokenizer = new java.util.StringTokenizer(reader.readLine());} catch (Exception e) {throw new RuntimeException(e);}}return tokenizer.nextToken();}private static double nd() {return Double.parseDouble(next());}private static long nl() {return Long.parseLong(next());}private static int[] na(int n) {int[] a = new int[n];for (int i = 0; i < n; i++)a[i] = ni();return a;}private static char[] ns() {return next().toCharArray();}private static long[] nal(int n) {long[] a = new long[n];for (int i = 0; i < n; i++)a[i] = nl();return a;}private static int[][] ntable(int n, int m) {int[][] table = new int[n][m];for (int i = 0; i < n; i++) {for (int j = 0; j < m; j++) {table[i][j] = ni();}}return table;}private static int[][] nlist(int n, int m) {int[][] table = new int[m][n];for (int i = 0; i < n; i++) {for (int j = 0; j < m; j++) {table[j][i] = ni();}}return table;}private static int ni() {return Integer.parseInt(next());}private static void tr(Object... o) {if (is != System.in)System.out.println(java.util.Arrays.deepToString(o));}}