結果
問題 | No.2017 Mod7 Parade |
ユーザー |
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提出日時 | 2024-04-02 15:10:04 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 754 ms / 2,000 ms |
コード長 | 2,485 bytes |
コンパイル時間 | 2,125 ms |
コンパイル使用メモリ | 78,272 KB |
実行使用メモリ | 61,836 KB |
最終ジャッジ日時 | 2024-09-30 23:14:15 |
合計ジャッジ時間 | 13,620 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 |
---|---|
sample | AC * 3 |
other | AC * 18 |
ソースコード
import java.io.*;import java.util.*;import java.util.function.*;import java.util.stream.*;public class Main {static final int MOD = 1000000007;public static void main(String[] args) throws Exception {Scanner sc = new Scanner();int n = sc.nextInt();int[] counts = new int[7];counts[0] = 1;while (n-- > 0) {int d = sc.nextInt() % 7;int length = sc.nextInt();int v = getLength(d, length);int w = pow(3, length);int[] current = new int[7];for (int i = 0; i < 7; i++) {int idx = (i * w + v) % 7;current[idx] += counts[i];current[idx] %= MOD;}for (int i = 0; i < 7; i++) {counts[i] += current[i];counts[i] %= MOD;}}long ans = 0;for (int i = 1; i < 7; i++) {ans += (long)i * counts[i] % MOD;ans %= MOD;}System.out.println(ans);}static int getLength(int d, int length) {if (length == 1) {return d;} else if (length % 2 == 0) {int tmp = getLength(d, length / 2);return (tmp * pow(3, length / 2) + tmp) % 7;} else {return (getLength(d, length - 1) * 10 + d) % 7;}}static int pow(int x, int p) {if (p == 0) {return 1;} else if (p % 2 == 0) {return pow(x * x % 7, p / 2);} else {return pow(x, p - 1) * x % 7;}}}class Scanner {BufferedReader br;StringTokenizer st = new StringTokenizer("");StringBuilder sb = new StringBuilder();public Scanner() {try {br = new BufferedReader(new InputStreamReader(System.in));} catch (Exception e) {}}public int nextInt() {return Integer.parseInt(next());}public long nextLong() {return Long.parseLong(next());}public double nextDouble() {return Double.parseDouble(next());}public String next() {try {while (!st.hasMoreTokens()) {st = new StringTokenizer(br.readLine());}} catch (Exception e) {e.printStackTrace();} finally {return st.nextToken();}}}