結果
問題 | No.314 ケンケンパ |
ユーザー |
|
提出日時 | 2019-08-13 23:31:42 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 203 ms / 1,000 ms |
コード長 | 2,938 bytes |
コンパイル時間 | 2,653 ms |
コンパイル使用メモリ | 77,704 KB |
実行使用メモリ | 80,668 KB |
最終ジャッジ日時 | 2024-09-19 13:37:29 |
合計ジャッジ時間 | 5,070 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 17 |
ソースコード
import java.util.*;import java.io.*;public class Main {static long MOD = 1000000007;public static void main(String[] args) {FastScanner sc = new FastScanner();int n = sc.nextInt();long[][] dp = new long[n + 1][3];dp[1][1] = 1;for (int i = 2; i <= n; i++) {dp[i][0] = (dp[i - 1][1] + dp[i - 1][2]) % MOD;dp[i][1] = dp[i - 1][0] % MOD;dp[i][2] = dp[i - 1][1] % MOD;}// System.out.println(Arrays.deepToString(dp));long ans = 0;for (int i = 0; i < 3; i++) {ans += dp[n][i];ans %= MOD;}System.out.println(ans);}}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++];elsereturn -1;}private static boolean isPrintableChar(int c) {return 33 <= c && c <= 126;}public boolean hasNext() {while (hasNextByte() && !isPrintableChar(buffer[ptr]))ptr++;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() {long nl = nextLong();if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)throw new NumberFormatException();return (int) nl;}public double nextDouble() {return Double.parseDouble(next());}}