#60099 (C++11) No.144 エラトステネスのざる

• 問題: No.144 エラトステネスのざる
• ユーザー: Gyuuto
• 提出日時: 2015-11-24 23:38:43
• 言語: C++11 (gcc 13.3.0)
• 結果: AC
• 実行時間: 54 ms / 2,000 ms
• コード長: 2,176 bytes
• コンパイル時間: 744 ms
• コンパイル使用メモリ: 81,180 KB
• 実行使用メモリ: 12,544 KB
• 最終ジャッジ日時: 2024-09-13 17:22:37
• 合計ジャッジ時間: 1,949 ms
• ジャッジサーバーID （参考情報）: judge1 / judge2

ファイルパターン	結果
sample	AC * 3
other	AC * 17

ソースコード

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// Standard I/O
#include <iostream>
#include <sstream>
#include <cstdio>
// Standard Library
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <cmath>
// Template Class
#include <complex>
#include <string>
#include <vector>
#include <list>
#include <set>
#include <map>
#include <queue>
#include <stack>
// Container Control
#include <algorithm>
using namespace std;
#define rep( i, n ) for( int i = 0; i < n; ++i )
#define irep( i, n ) for( int i = n-1; i >= 0; --i )
#define reep( i, s, n ) for ( int i = s; i < n; ++i )
#define ireep( i, n, s ) for ( int i = n-1; i >= s; --i )
#define foreach(itr, x) for( typeof(x.begin()) itr = x.begin(); itr != x.end(); ++itr)
#define mp( a, b ) make_pair( a, b )
#define pb( a ) push_back( a )
#define all( v ) v.begin(), v.end()
#define fs first
#define sc second
#define vc vector
// for visualizer.html
double SCALE = 1.0;
double OFFSET_X = 0.0;
double OFFSET_Y = 0.0;
#define LINE(x,y,a,b) cerr << "line(" << SCALE*(x) + OFFSET_X << ","    \
    << SCALE*(y) + OFFSET_Y << ","                                      \
    << SCALE*(a) + OFFSET_X << ","                                      \
    << SCALE*(b) + OFFSET_Y << ")" << endl;
#define CIRCLE(x,y,r) cerr << "circle(" << SCALE*(x) + OFFSET_X << ","  \
    << SCALE*(y) + OFFSET_Y << ","                                      \
    << SCALE*(r) << ")" << endl;
typedef long long ll;
typedef complex<double> Point;
typedef pair<int, int> pii;
typedef pair<int, pii> ipii;
typedef vector<int> vi;
typedef vector<double> vd;
typedef vector< vector<int> > vii;
typedef vector< vector<double> > vdd;
typedef vector<int>::iterator vi_itr;
const int IINF = 1 << 28;
const double INF = 1e30;
const double EPS = 1e-10;
const double PI = acos(-1.0);
// Direction : L U R D
const int dx[] = { -1, 0, 1, 0};
const int dy[] = { 0, -1, 0, 1 };
bool isprime[1000010];
double dp[1000010];
int main()
{
    int N;
    double p;
    reep(i, 2, 1000010) isprime[i] = true;
    reep(i, 2, 1000010) if( isprime[i] ) for( int j = 2*i; j < 1000010; j+=i ) isprime[j] = false;
    cin >> N >> p;
    reep(i, 2, N+1) dp[i] = 1.0;
    reep(i, 2, N+1){
        for( int j = 2*i; j <= N; j+=i ){
            dp[j] *= (1 - p);
        }
    }
    double ans = 0.0;
    reep(i, 2, N+1){
        ans += dp[i];
    }
    printf("%.16f\n", ans);
}
 
 
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