結果

問題 No.65 回数の期待値の練習
ユーザー amyuamyu
提出日時 2016-05-26 21:10:59
言語 Java21
(openjdk 21)
結果
AC  
実行時間 53 ms / 5,000 ms
コード長 3,692 bytes
コンパイル時間 2,462 ms
コンパイル使用メモリ 78,352 KB
実行使用メモリ 37,052 KB
最終ジャッジ日時 2024-04-16 17:39:01
合計ジャッジ時間 4,467 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge4
このコードへのチャレンジ
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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 51 ms
36,812 KB
testcase_01 AC 50 ms
36,864 KB
testcase_02 AC 50 ms
36,552 KB
testcase_03 AC 51 ms
36,876 KB
testcase_04 AC 51 ms
36,828 KB
testcase_05 AC 51 ms
36,500 KB
testcase_06 AC 52 ms
36,576 KB
testcase_07 AC 52 ms
36,784 KB
testcase_08 AC 51 ms
36,696 KB
testcase_09 AC 53 ms
36,512 KB
testcase_10 AC 52 ms
36,680 KB
testcase_11 AC 51 ms
36,828 KB
testcase_12 AC 53 ms
36,892 KB
testcase_13 AC 51 ms
36,532 KB
testcase_14 AC 52 ms
36,900 KB
testcase_15 AC 51 ms
36,564 KB
testcase_16 AC 51 ms
36,560 KB
testcase_17 AC 53 ms
36,536 KB
testcase_18 AC 51 ms
37,052 KB
testcase_19 AC 53 ms
36,796 KB
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ソースコード

diff # 

import java.util.*;
import java.io.*;

public class Main{
    static final Reader sc = new Reader();
    static final PrintWriter out = new PrintWriter(System.out,false);

    public static void main(String[] args) throws Exception {
    	int k = sc.nextInt();
    	double[] e = new double[150];
    	Arrays.fill(e,1.0);
    	e[0] = 0;
    	for(int i=0;i<=20;i++){
    		e[i+1] += e[i]/6;
    		e[i+2] += e[i]/6;
    		e[i+3] += e[i]/6;
    		e[i+4] += e[i]/6;
    		e[i+5] += e[i]/6;
    		e[i+6] += e[i]/6;
    	}
    	out.println(e[k]);
        sc.close();
        out.close();
    }

    static void trace(Object... o) { System.out.println(Arrays.deepToString(o));}
}

class Reader {

    private final InputStream in;
    private final byte[] buf = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    public Reader() { this(System.in);}
    public Reader(InputStream source) { this.in = source;}

    private boolean hasNextByte() {
        if (ptr < buflen) return true;
        ptr = 0;
        try{
            buflen = in.read(buf);
        }catch (IOException e) {e.printStackTrace();}
        if (buflen <= 0) return false;
        return true;
    }

    private int readByte() { if (hasNextByte()) return buf[ptr++]; else return -1;}

    private boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}

    private void skip() { while(hasNextByte() && !isPrintableChar(buf[ptr])) ptr++;}

    public boolean hasNext() {skip(); 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();
        boolean minus = false;
        long num = readByte();

        if(num == '-'){
            num = 0;
            minus = true;
        }else if (num < '0' || '9' < num){
            throw new NumberFormatException();
        }else{
            num -= '0';
        }

        while(true){
            int b = readByte();
            if('0' <= b && b <= '9')
                num = num * 10 + (b - '0');
            else if(b == -1 || !isPrintableChar(b))
                return minus ? -num : num;
            else
                throw new NoSuchElementException();
        }
    }

    public int nextInt() {
        long num = nextLong();
        if (num < Integer.MIN_VALUE || Integer.MAX_VALUE < num)
            throw new NumberFormatException();
        return (int)num;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }

    public char nextChar() {
        if (!hasNext()) throw new NoSuchElementException();
        return (char)readByte();
    }

    public String nextLine() {
        while (hasNextByte() && (buf[ptr] == '\n' || buf[ptr] == '\r')) ptr++;
        if (!hasNextByte()) throw new NoSuchElementException();

        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (b != '\n' && b != '\r') {
            sb.appendCodePoint(b);
            b = readByte();
        }

        return sb.toString();
    }

    public int[] nextIntArray(int n) {
        int[] res = new int[n];
        for (int i=0; i<n; i++) res[i] = nextInt();
        return res;
    }

    public char[] nextCharArray(int n) {
        char[] res = new char[n];
        for (int i=0; i<n; i++) res[i] = nextChar();
        return res;
    }

    public void close() {try{ in.close();}catch(IOException e){ e.printStackTrace();}};
}
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