結果
問題 | No.1879 How many matchings? |
ユーザー | 37zigen |
提出日時 | 2022-01-12 01:33:31 |
言語 | Java21 (openjdk 21) |
結果 |
WA
|
実行時間 | - |
コード長 | 3,374 bytes |
コンパイル時間 | 2,383 ms |
コンパイル使用メモリ | 78,312 KB |
実行使用メモリ | 37,128 KB |
最終ジャッジ日時 | 2024-11-15 18:03:33 |
合計ジャッジ時間 | 3,956 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 53 ms
36,636 KB |
testcase_01 | AC | 54 ms
37,124 KB |
testcase_02 | AC | 57 ms
37,104 KB |
testcase_03 | AC | 55 ms
37,128 KB |
testcase_04 | AC | 56 ms
37,096 KB |
testcase_05 | AC | 56 ms
37,080 KB |
testcase_06 | AC | 55 ms
37,072 KB |
testcase_07 | AC | 56 ms
36,812 KB |
testcase_08 | AC | 55 ms
36,684 KB |
testcase_09 | AC | 55 ms
36,732 KB |
testcase_10 | WA | - |
testcase_11 | WA | - |
testcase_12 | WA | - |
testcase_13 | AC | 55 ms
36,660 KB |
testcase_14 | AC | 56 ms
37,088 KB |
ソースコード
import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.Arrays; import java.util.NoSuchElementException; public class Main { public static void main(String[] args) throws IOException { new Main().run(); } long pow(long a, long n) { if (n==0) return 1; return pow(a*a%mod, n/2) * (n%2==1?a:1) % mod; } long inv(long a) { return pow(a, mod-2); } final long mod=(long)1e9+7; long[][] mul(long[][] a, long[][] b) { long[][] c=new long[a.length][b[0].length]; for (int i=0;i<a.length;++i) { for (int j=0;j<b[0].length;++j) { for (int k=0;k<a[i].length;++k) { c[i][j]+=a[i][k]*b[k][j]%mod; c[i][j]%=mod; } } } return c; } long[][] pow(long[][] a, long n) { long[][] ret=new long[a.length][a.length]; for (int i=0;i<a.length;++i) ret[i][i]=1; if (n==0) return ret; ret=pow(mul(a, a), n/2); if (n%2==1) ret=mul(ret, a); return ret; } long f(long n) { if (n % 2 == 0) { long[][] mat=new long[][] {{1, 1}, {1, 0}}; long[][] vec=new long[][] {{1}, {0}}; vec = mul(pow(mat, n/2), vec); return vec[0][0]; } else { long[][] mat=new long[][] {{2, 1, -2, -1}, {1, 0, 0, 0}, {0, 1, 0, 0}, {0, 0, 1, 0}}; long[][] vec=new long[][] {{15}, {7}, {3}, {1}}; if ((n-1)/2 <= 3) return vec[(int)(3-(n-1)/2)][0]; vec = mul(pow(mat, (n-1)/2-3), vec); return vec[0][0]; } } void run() { FastScanner sc=new FastScanner(); PrintWriter pw=new PrintWriter(System.out); long n=sc.nextLong(); System.out.println(f(n)); pw.close(); } void tr(Object... o) { System.out.println(Arrays.deepToString(o)); } } 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++]; else return -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()); } }