結果

問題 No.106 素数が嫌い!2
ユーザー renjyaku_int
提出日時 2020-10-26 21:08:49
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 1,225 ms / 5,000 ms
コード長 3,344 bytes
コンパイル時間 2,505 ms
コンパイル使用メモリ 208,576 KB
最終ジャッジ日時 2025-01-15 15:56:21
ジャッジサーバーID
(参考情報)
judge3 / judge2
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 * 13
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 <tourist>
#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
//using namespace atcoder;
typedef long long ll;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<ll, ll> p;
const int INF = 1e9;
const ll LINF = ll(1e18);
const int MOD = 1000000007;
const int dx[4] = {0, 1, 0, -1}, dy[4] = {-1, 0, 1, 0};
const int Dx[8] = {0, 1, 1, 1, 0, -1, -1, -1}, Dy[8] = {-1, -1, 0, 1, 1, 1, 0, -1};
#define yes cout << "Yes" << endl
#define YES cout << "YES" << endl
#define no cout << "No" << endl
#define NO cout << "NO" << endl
#define rep(i, n) for (int i = 0; i < n; i++)
#define ALL(v) v.begin(), v.end()
#define debug(v) \
cout << #v << ":"; \
for (auto x : v) \
{ \
cout << x << ' '; \
} \
cout << endl;
template <class T>
bool chmax(T &a, const T &b)
{
if (a < b)
{
a = b;
return 1;
}
return 0;
}
template <class T>
bool chmin(T &a, const T &b)
{
if (b < a)
{
a = b;
return 1;
}
return 0;
}
//cout<<fixed<<setprecision(15);15
//-std=c++14
//g++ yarudake.cpp -std=c++17 -I .
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }
class smart_sieve
{
ll L, R, M;
vector<int> small; //
vector<vector<ll>> large; //
vector<ll> aux; // aux[i] := large[i]
public:
smart_sieve(ll L, ll R) : L(L), R(R), M(sqrt(R) + 1)
{
small.resize(M);
iota(small.begin(), small.end(), 0);
large.resize(R - L);
aux.assign(R - L, 1);
for (ll i = 2; i * i < R; ++i)
{
if (small[i] < i)
continue;
small[i] = i;
for (ll j = i * i; j < M; j += i)
if (small[j] == j)
small[j] = i;
for (ll j = (L + i - 1) / i * i; j < R; j += i)
{
ll k = j;
do
{
// aux[j-L] > M
// j / aux[j-L] < M
if (aux[j - L] * aux[j - L] > R)
break;
large[j - L].push_back(i);
aux[j - L] *= i;
k /= i;
} while (k % i == 0);
}
}
}
vector<ll> factor(ll n)
{
assert(L <= n && n < R);
vector<ll> res = large[n - L];
n /= aux[n - L];
if (n >= M)
{
// n
// n*n >= R
res.push_back(n);
return res;
}
while (n > 1)
{
res.push_back(small[n]);
n /= small[n];
}
return res;
}
};
int main()
{
cin.tie(0);
ios::sync_with_stdio(false);
ll n,k;
cin>>n>>k;
int ans=0;
smart_sieve ss(1, n+1);
for(ll i=1;i<=n;i++){
vector<ll> f = ss.factor(i);
set<ll> s;
rep(j,f.size()){
s.insert(f[j]);
}
if(s.size()>=k)ans++;
}
cout<<ans<<"\n";
}
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