結果
| 問題 |
No.108 トリプルカードコンプ
|
| コンテスト | |
| ユーザー |
 Oland
|
| 提出日時 | 2019-10-29 20:57:00 |
| 言語 | Java (openjdk 23) |
| 結果 |
AC
|
| 実行時間 | 95 ms / 5,000 ms |
| コード長 | 6,506 bytes |
| コンパイル時間 | 4,209 ms |
| コンパイル使用メモリ | 93,016 KB |
| 実行使用メモリ | 51,060 KB |
| 最終ジャッジ日時 | 2024-09-14 21:36:14 |
| 合計ジャッジ時間 | 7,047 ms |
|
ジャッジサーバーID （参考情報） |
judge2 / judge3 |
（要ログイン）
| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 20 |
ソースコード
import java.io.*;
import java.util.*;
@SuppressWarnings("unused")
public class Main implements Runnable{
private FastScanner in;
private PrintWriter out;
final int MOD = (int)1e9+7;
long ceil(long a, long b){return (a + b - 1) / b;}
long gcd(long a, long b){return b == 0 ? a : gcd(b, a % b);}
long lcm(long a, long b){return a / gcd(a, b) * b; /*オーバーフローに注意*/}
private void solve() {
int N = in.nextInt();
int[] num = new int[4];
for(int i = 0; i < N; i++) num[Math.min(3, in.nextInt())]++;
//0,1,2
double[][][] dp = new double[N+1][N+1][N+1];
//dp[0][0][0] = 0.0;
for(int i = 0; i <= N; i++){
for(int j = 0; j <= N; j++){
for(int k = 0; k <= N; k++){
if(i == 0 && j == 0 && k == 0) continue;
if((i + j + k) > N) continue;
double e = 0;
if(i > 0) e += (dp[i-1][j+1][k] + 1) * i / N;
if(j > 0) e += (dp[i][j-1][k+1] + 1) * j / N;
if(k > 0) e += (dp[i ][j][k-1] + 1) * k / N;
int m = N - i - j - k;
if(m != 0){
e += (double)m / N;
e *= (double)N / (N - m);
}
dp[i][j][k] = e;
}
}
}
out.println(dp[num[0]][num[1]][num[2]]);
}
//end solve
public static void main(String[] args) {
Thread.setDefaultUncaughtExceptionHandler((t,e)->System.exit(1));
new Thread(null, new Main(), "", 16L * 1024 * 1024).start();
}
public void run() {
in = new FastScanner(System.in);
out = new PrintWriter(System.out);
solve();
out.flush();
}
static class FastScanner {
Reader input;
FastScanner() {this(System.in);}
FastScanner(InputStream stream) {this.input = new BufferedReader(new InputStreamReader(stream));}
int nextInt() {return (int) nextLong();}
long nextLong() {
try {
int sign = 1;
int b = input.read();
while ((b < '0' || '9' < b) && b != '-' && b != '+') {
b = input.read();
}
if (b == '-') {
sign = -1;
b = input.read();
} else if (b == '+') {
b = input.read();
}
long ret = b - '0';
while (true) {
b = input.read();
if (b < '0' || '9' < b) return ret * sign;
ret *= 10;
ret += b - '0';
}
} catch (IOException e) {
e.printStackTrace();
return -1;
}
}
double nextDouble() {
try {
double sign = 1;
int b = input.read();
while ((b < '0' || '9' < b) && b != '-' && b != '+') {
b = input.read();
}
if (b == '-') {
sign = -1;
b = input.read();
} else if (b == '+') {
b = input.read();
}
double ret = b - '0';
while (true) {
b = input.read();
if (b < '0' || '9' < b) break;
ret *= 10;
ret += b - '0';
}
if (b != '.') return sign * ret;
double div = 1;
b = input.read();
while ('0' <= b && b <= '9') {
ret *= 10;
ret += b - '0';
div *= 10;
b = input.read();
}
return sign * ret / div;
} catch (IOException e) {
e.printStackTrace();
return Double.NaN;
}
}
char nextChar() {
try {
int b = input.read();
while (Character.isWhitespace(b)) {
b = input.read();
}
return (char) b;
} catch (IOException e) {
e.printStackTrace();
return 0;
}
}
String nextStr() {
try {
StringBuilder sb = new StringBuilder();
int b = input.read();
while (Character.isWhitespace(b)) {
b = input.read();
}
while (b != -1 && !Character.isWhitespace(b)) {
sb.append((char) b);
b = input.read();
}
return sb.toString();
} catch (IOException e) {
e.printStackTrace();
return "";
}
}
public int[] nextIntArray(int n) {
int[] res = new int[n];
for (int i = 0; i < n; i++) {
res[i] = nextInt();
}
return res;
}
public int[] nextIntArrayDec(int n) {
int[] res = new int[n];
for (int i = 0; i < n; i++) {
res[i] = nextInt() - 1;
}
return res;
}
public int[] nextIntArray1Index(int n) {
int[] res = new int[n + 1];
for (int i = 0; i < n; i++) {
res[i + 1] = nextInt();
}
return res;
}
public long[] nextLongArray(int n) {
long[] res = new long[n];
for (int i = 0; i < n; i++) {
res[i] = nextLong();
}
return res;
}
public long[] nextLongArrayDec(int n) {
long[] res = new long[n];
for (int i = 0; i < n; i++) {
res[i] = nextLong() - 1;
}
return res;
}
public long[] nextLongArray1Index(int n) {
long[] res = new long[n + 1];
for (int i = 0; i < n; i++) {
res[i + 1] = nextLong();
}
return res;
}
public double[] nextDoubleArray(int n) {
double[] res = new double[n];
for (int i = 0; i < n; i++) {
res[i] = nextDouble();
}
return res;
}
}
}