結果

問題 No.144 エラトステネスのざる
ユーザー OlandOland
提出日時 2019-03-24 13:45:25
言語 Java21
(openjdk 21)
結果
AC  
実行時間 121 ms / 2,000 ms
コード長 3,406 bytes
コンパイル時間 1,976 ms
コンパイル使用メモリ 77,952 KB
実行使用メモリ 58,444 KB
最終ジャッジ日時 2024-04-10 01:11:16
合計ジャッジ時間 4,352 ms
ジャッジサーバーID
(参考情報)
judge4 / judge3
このコードへのチャレンジ
(要ログイン)

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 52 ms
50,156 KB
testcase_01 AC 51 ms
50,056 KB
testcase_02 AC 50 ms
50,384 KB
testcase_03 AC 49 ms
50,016 KB
testcase_04 AC 50 ms
50,520 KB
testcase_05 AC 50 ms
50,544 KB
testcase_06 AC 50 ms
50,380 KB
testcase_07 AC 50 ms
50,152 KB
testcase_08 AC 51 ms
50,420 KB
testcase_09 AC 51 ms
50,680 KB
testcase_10 AC 49 ms
50,564 KB
testcase_11 AC 49 ms
50,072 KB
testcase_12 AC 49 ms
50,280 KB
testcase_13 AC 118 ms
58,124 KB
testcase_14 AC 121 ms
58,444 KB
testcase_15 AC 118 ms
58,228 KB
testcase_16 AC 118 ms
58,228 KB
testcase_17 AC 118 ms
58,244 KB
testcase_18 AC 120 ms
58,156 KB
testcase_19 AC 117 ms
57,912 KB
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ソースコード

diff #

import java.io.*;
import java.util.*;
import java.util.Map.Entry;

public class Main {
	
	final boolean isDebug = false;
	String fileName = "input.txt";
	FastScanner sc;
	//PrintWriter out;
	final int MOD = (int)1e9+7;
	final int INF = Integer.MAX_VALUE / 2;
		
	/* solve */
	
	void solve() throws Exception{
		int N = sc.nextInt();
		double p = sc.nextDouble();
		double e = (1 - p);
		double[] isNotPrime = new double[N+1];
		Arrays.fill(isNotPrime, 1);
		double sum = 0;
		
		for(int i = 2; i <= N; i++){
			for(int j = i + i; j <= N; j += i){
				isNotPrime[j] *= e;
			}
		}
		for(int i = 2; i <= N; i++){
			sum += isNotPrime[i];
			//System.out.println(isNotPrime[i]);
		}
		System.out.println(sum);
	}
	
	/* end solve */
	
	/* main */
	public static void main(String[] args) throws Exception {
		new Main().m();
	}
	
	void m() throws Exception {
		long S = System.currentTimeMillis();
		sc = (isDebug) ? new FastScanner(new FileInputStream(fileName)) : new FastScanner(System.in);
		//out = new PrintWriter(System.out);
		solve();
		//out.flush();
		long G = System.currentTimeMillis();
		if(isDebug){
			System.out.println("---Debug---");
			System.out.printf("%8d ms", (G-S));
		}
	}
	/* end main */
}
/* end Main */

class FastScanner {
    private InputStream in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    public FastScanner(InputStream in) {
		this.in = in;
	}
    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());
    }
}
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