結果

問題 No.1653 Squarefree
ユーザー tokusakurai
提出日時 2021-08-20 22:14:21
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 440 ms / 2,000 ms
コード長 1,741 bytes
コンパイル時間 2,013 ms
コンパイル使用メモリ 196,520 KB
最終ジャッジ日時 2025-01-23 23:37:01
ジャッジサーバーID
(参考情報)
judge4 / 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 * 38
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 <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i = 0; i < n; i++)
#define rep2(i, x, n) for(int i = x; i <= n; i++)
#define rep3(i, x, n) for(int i = x; i >= n; i--)
#define each(e, v) for(auto &e: v)
#define pb push_back
#define eb emplace_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)x.size()
using ll = long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
const int MOD = 1000000007;
//const int MOD = 998244353;
const int inf = (1<<30)-1;
const ll INF = (1LL<<60)-1;
template<typename T> bool chmax(T &x, const T &y) {return (x < y)? (x = y, true) : false;};
template<typename T> bool chmin(T &x, const T &y) {return (x > y)? (x = y, true) : false;};
struct io_setup{
io_setup(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout << fixed << setprecision(15);
}
} io_setup;
int main(){
ll L, R; cin >> L >> R;
int K = R-L;
vector<bool> ok(K+1, true);
ll M = 1000000;
rep2(i, 1, M){
ll l = 1, r = inf; //(l,r]
while(r-l > 1){
ll m = (l+r)/2;
ll t = m*m;
if(t > (L-1)/i) r = m;
else l = m;
}
for(ll t = r; t*t*i <= R; t++){
ok[t*t*i-L] = false;
}
}
vector<bool> ps(M+1, true);
for(ll i = 2; i <= M; i++){
if(!ps[i]) continue;
for(ll t = ((L+i-1)/i)*i; t <= R; t += i){
if(t%(i*i) == 0) ok[t-L] = false;
}
for(int j = i+i; j <= M; j += i){
ps[j] = false;
}
}
int ans = 0;
rep(i, K+1){
if(ok[i]) ans++;
}
cout << ans << '\n';
}
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