結果
問題 | No.133 カードゲーム |
ユーザー |
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提出日時 | 2018-12-21 16:14:55 |
言語 | Java (openjdk 23) |
結果 |
AC
|
実行時間 | 54 ms / 5,000 ms |
コード長 | 3,331 bytes |
コンパイル時間 | 2,674 ms |
コンパイル使用メモリ | 77,888 KB |
実行使用メモリ | 50,260 KB |
最終ジャッジ日時 | 2024-09-25 09:32:11 |
合計ジャッジ時間 | 4,653 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 19 |
ソースコード
import java.io.IOException;import java.io.InputStream;import java.util.Arrays;import java.util.NoSuchElementException;public class Main {public static void main(String args[]) {FastScanner scanner = new FastScanner();int n=scanner.nextInt();int[] a=new int[n];int[] b=new int[n];for(int i=0;i<n;i++) {a[i]=scanner.nextInt();}for(int i=0;i<n;i++) {b[i]=scanner.nextInt();}Arrays.sort(a);Arrays.sort(b);int cnt=0;do {do {int tmp=0;for(int i=0;i<n;i++) {if(a[i]>b[i])tmp++;}if(tmp>n/2)cnt++;}while(next_permutation(b));Arrays.sort(b);}while(next_permutation(a));long f=factorial(n);System.out.println((double)cnt/(f*f));}private static boolean next_permutation(int[] p) {for (int a = p.length - 2; a >= 0; --a) {if (p[a] < p[a + 1]) {for (int b = p.length - 1;; --b) {if (p[b] > p[a]) {int t = p[a];p[a] = p[b];p[b] = t;for (++a, b = p.length - 1; a < b; ++a, --b) {t = p[a];p[a] = p[b];p[b] = t;}return true;}}}}return false;}static long factorial(int n){long s = 1;for (int i = 1; i <= n; i++)s *= i;return s;}}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());}}