結果
| 問題 |
No.173 カードゲーム(Medium)
|
| コンテスト | |
| ユーザー |
ぴろず
|
| 提出日時 | 2015-03-28 18:45:55 |
| 言語 | Java (openjdk 23) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 5,492 bytes |
| コンパイル時間 | 3,015 ms |
| コンパイル使用メモリ | 78,536 KB |
| 実行使用メモリ | 47,748 KB |
| 最終ジャッジ日時 | 2024-06-29 01:33:44 |
| 合計ジャッジ時間 | 9,609 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 2 WA * 8 |
ソースコード
package no173;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.NoSuchElementException;
public class Main {
static IO io = new IO();
static int GETA = 20005;
static int MAX = 40010;
public static void main(String[] args) {
int n = io.nextInt();
double[] p = io.nextDoubleArray(2);
int[][] hand = new int[2][];
for(int i=0;i<2;i++) {
hand[i] = io.nextIntArray(n);
Arrays.sort(hand[i]);
}
//q[i][j] := i+1ターン目にj+1番目に小さいカードを出す確率
double[][][] q = new double[2][n][n];
for(int pl=0;pl<2;pl++) {
for(int j=0;j<n;j++) {
// dp_j[k]^(i) := i+1ターン目で、j+1番目に小さいカードより小さいカードがk枚ある確率
double[] dp = new double[n];
dp[j] = 1;
for(int i=0;i<n;i++) { //配るDP
if (i == n - 1) {
q[pl][i][j] += dp[0];
}else{
q[pl][i][j] += p[pl] * dp[0];
dp[0] *= 1 - p[pl];
for(int k=1;k<n;k++) {
dp[k-1] += dp[k] * (p[pl] + (k-1) * (1-p[pl]) / (n-i-1));
q[pl][i][j] += dp[k] * (1-p[pl]) / (n-i-1);
dp[k] *= (n-i-k-1) * (1-p[pl]) / (n-i-1);
}
}
}
}
}
double ans = 0;
double[][] dp = new double[n+1][MAX];
dp[0][GETA] = 1;
for(int t=0;t<n;t++) {
for(int k=0;k<MAX;k++) {
if (dp[t][k] < 1E-9) {
continue;
}
for(int i=0;i<n;i++) {
for(int j=0;j<n;j++) {
int dpoint = hand[0][i] > hand[1][j] ? (hand[0][i] + hand[1][j]) : -(hand[0][i] + hand[1][j]);
// System.out.println(q[0][t][i] * q[1][t][j]);
int nk = k + dpoint;
if (nk < 0 || nk >= MAX) {
continue;
}
dp[t+1][nk] += dp[t][k] * q[0][t][i] * q[1][t][j];
}
}
}
// for(int i=GETA-10;i<=GETA+10;i++) {
// System.out.print(dp[t][i] + ",");
// }
// System.out.println();
}
for(int i=GETA+1;i<MAX;i++) {
ans += dp[n][i];
}
System.out.println(ans);
}
}
class IO extends PrintWriter {
private final InputStream in;
private final byte[] buffer = new byte[1024];
private int ptr = 0;
private int buflen = 0;
public IO() { this(System.in);}
public IO(InputStream source) { super(System.out); this.in = source;}
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;}
private static boolean isNewLine(int c) { return c == '\n' || c == '\r';}
public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
public boolean hasNextLine() { while(hasNextByte() && isNewLine(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 char[] nextCharArray(int len) {
if (!hasNext()) {
throw new NoSuchElementException();
}
char[] s = new char[len];
int i = 0;
int b = readByte();
while(isPrintableChar(b)) {
if (i == len) {
throw new InputMismatchException();
}
s[i++] = (char) b;
b = readByte();
}
return s;
}
public String nextLine() {
if (!hasNextLine()) {
throw new NoSuchElementException();
}
StringBuilder sb = new StringBuilder();
int b = readByte();
while(!isNewLine(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 char nextChar() {
if (!hasNext()) {
throw new NoSuchElementException();
}
return (char) readByte();
}
public double nextDouble() { return Double.parseDouble(next());}
public int[] nextIntArray(int n) { int[] a = new int[n]; for(int i=0;i<n;i++) a[i] = nextInt(); return a;}
public long[] nextLongArray(int n) { long[] a = new long[n]; for(int i=0;i<n;i++) a[i] = nextLong(); return a;}
public double[] nextDoubleArray(int n) { double[] a = new double[n]; for(int i=0;i<n;i++) a[i] = nextDouble(); return a;}
public void nextIntArrays(int[]... a) { for(int i=0;i<a[0].length;i++) for(int j=0;j<a.length;j++) a[j][i] = nextInt();}
public int[][] nextIntMatrix(int n,int m) { int[][] a = new int[n][]; for(int i=0;i<n;i++) a[i] = nextIntArray(m); return a;}
public char[][] nextCharMap(int n,int m) { char[][] a = new char[n][]; for(int i=0;i<n;i++) a[i] = nextCharArray(m); return a;}
public void close() { super.close(); try {in.close();} catch (IOException e) {}}
}
ぴろず