結果

問題 No.144 エラトステネスのざる
ユーザー lskjfsdhj
提出日時 2019-08-25 10:43:51
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 55 ms / 2,000 ms
コード長 4,319 bytes
コンパイル時間 1,082 ms
コンパイル使用メモリ 108,112 KB
実行使用メモリ 11,392 KB
最終ジャッジ日時 2024-10-15 20:24:51
合計ジャッジ時間 2,225 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 17
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#include<iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <string>
#include <string.h>
#include <climits>
#include <cmath>
#include <map>
#include <set>
#include <bitset>
#include <stack>
#include <queue>
#include <fstream>
#include <functional>
using namespace std;
using ll = long long;
const ll MAX_V = 1010;
const ll MAX_E = 2010;
ll V, E;
struct edge {
    ll from, to, cost;
};
edge ES[MAX_E];
ll d[MAX_V];
const ll MOD = (ll) 1e9 + 7;
const int MAX_INT = 1 << 17;
vector<bool> prime;
#define all(x) (x).begin(),(x).end()
#define PRI(n) cout << n <<endl;
#define PRI2(n, m) cout << n << " " << m << " "<<endl;
#define REP(i, n)  for(ll i = 0; i < (ll)n; ++i)
#define REPbit(bit, n)  for(int bit = 0; bit < (int)(1<<n); ++bit)
#define FOR(i, t, n)  for(ll i = t; i <= (ll)n; ++i)
void Era(int x) {
    prime.resize(x + 1, 1);
    prime[0] = 0;
    prime[1] = 0;
    FOR(i, 2, x) {
        if (prime[i]) {
            for (int j = 2 * i; j <= x; j += i) {
                prime[j] = 0;
            }
        }
    }
}
bool isPrime(ll x) {
    if (x == 0)return 0;
    if (x == 1)return 0;
    if (x == 2)return 1;
    if (x % 2 == 0)return 0;
    FOR(i, 3, sqrt(x) + 1) {
        if (x % i == 0)return 0;
    }
    return 1;
}
ll GCD(ll a, ll b) {
    if (b == 0)return a;
    return GCD(b, a % b);
}
ll LCM(ll a, ll b) {
    ll gcd = GCD(a, b);
    return a / gcd * b;
}
ll nCr(ll n, ll r) {
    vector<ll> C(r + 1);
    C[0] = 1;
    FOR(i, 1, n)
        for (ll j = min(i, r); j < 1; --j)
            C[j] = (C[j] + C[j - 1]);
    return C[r];
}
template<class T>
class SegTree {
    int n;
    vector<T> data;
    T def;
    function<T(T, T)> operation;
    function<T(T, T)> update;
    T _query(int a, int b, int k, int l, int r) {
        if (r <= a || b <= l) return def;
        if (a <= l && r <= b)
            return data[k];
        else {
            T c1 = _query(a, b, 2 * k + 1, l, (l + r) / 2);
            T c2 = _query(a, b, 2 * k + 2, (l + r) / 2, r);
            return operation(c1, c2);
        }
    }
public:
    SegTree(size_t _n, T _def, function<T(T, T)> _operation,
            function<T(T, T)> _update)
            : def(_def), operation(_operation), update(_update) {
        n = 1;
        while (n < _n) {
            n *= 2;
        }
        data = vector<T>(2 * n - 1, def);
    }
    void change(int i, T x) {
        i += n - 1;
        data[i] = update(data[i], x);
        while (i > 0) {
            i = (i - 1) / 2;
            data[i] = operation(data[i * 2 + 1], data[i * 2 + 2]);
        }
    }
    T query(int a, int b) {
        return _query(a, b, 0, 0, n);
    }
    T operator[](int i) {
        return data[i + n - 1];
    }
};
struct UnionFind {
    vector<int> par;
    vector<int> rank;
    UnionFind(int N) {
        for (int i = 0; i < N; ++i) {
            par.push_back(i);
            rank.push_back(0);
        }
    }
    int find(int x) {
        if (par[x] == x)return x;
        else return par[x] = find(par[x]);
    }
    void unite(int x, int y) {
        x = find(x);
        y = find(y);
        if (x == y)return;
        if (rank[x] < rank[y])par[x] = y;
        else {
            par[y] = x;
            if (rank[x] == rank[y])rank[x]++;
        }
    }
    bool same(int x, int y) {
        return find(x) == find(y);
    }
};
struct ListNode {
    int val;
    ListNode *next;
    ListNode(int x) : val(x), next(NULL) {}
};
void Bellman_short(int s) {
    REP(i, V)d[i] = 1LL << 50;
    d[s] = 0;
    REP(i, V)REP(i, E) {
            edge e = ES[i];
            if (d[e.from] != 1LL << 50 && d[e.to] > d[e.from] + e.cost) {
                d[e.to] = d[e.from] + e.cost;
            }
        }
}
bool Bellman_negLoop(int s) {
    REP(i, V)d[i] = 1LL << 50;
    d[s] = 0;
    REP(i, V)REP(j, E) {
            edge e = ES[j];
            if (d[e.from] != 1LL << 50 && d[e.to] > d[e.from] + e.cost) {
                d[e.to] = d[e.from] + e.cost;
                if (i == V - 1)return true;
            }
        }
    return false;
}
int main() {
    ll N;
    double p;
    cin >> N >> p;
    vector<double> v(N + 1, 1);
    FOR(i, 2, N)for (int j = 2 * i; j <= N; j += i) v[j] *= (1.0 - p);
    double sum = 0;
    FOR(i, 2, N) sum += v[i];
    printf("%.10f",sum);
    return 0;
}
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