結果

問題 No.1383 Numbers of Product
ユーザー milanis48663220
提出日時 2021-07-01 22:54:43
言語 C++17(gcc12)
(gcc 12.3.0 + boost 1.87.0)
結果
AC  
実行時間 1,614 ms / 2,000 ms
コード長 2,399 bytes
コンパイル時間 4,500 ms
コンパイル使用メモリ 155,904 KB
最終ジャッジ日時 2025-01-22 15:28:52
ジャッジサーバーID
(参考情報)
judge1 / judge1
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 * 2
other AC * 51
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 <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>
#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
using namespace std;
typedef long long ll;
const ll INF = 2e18;
ll calc(ll a, ll b, ll k){
ll ans = a;
for(ll i = 1; i <= b; i++){
if(k >= INF/i) return INF;
ll x = a+k*i;
if(ans >= INF/x) return INF;
ans *= x;
}
// cout << "calc(" << a << "," << b << "," << k << ") = " << ans << endl;
return ans;
}
ll f(ll x, ll k){
ll l = 0, r = 1e9;
while(r-l > 1){
ll c = (l+r)/2;
if(calc(c, 1, k) > x) r = c;
else l = c;
}
return l;
}
int naive(ll n, ll k, ll m){
map<ll, int> cnt;
for(int b = 1; ; b++){
if(calc(1, b, k) > n) break;
for(int a = 1; ; a++){
ll x = calc(a, b, k);
if(x > n) break;
if(cnt.count(x) == 0) cnt[x] = 1;
else cnt[x]++;
}
}
int ans = 0;
for(auto [_, c]: cnt){
if(c == m) ans++;
}
return ans;
}
int main(){
ios::sync_with_stdio(false);
cin.tie(0);
cout << setprecision(10) << fixed;
ll n, k, m; cin >> n >> k >> m;
map<ll, int> cnt;
for(int b = 2; ; b++){
if(calc(1, b, k) > n) break;
for(int a = 1; ; a++){
ll x = calc(a, b, k);
if(x > n) break;
if(cnt.count(x) == 0) cnt[x] = 1;
else cnt[x]++;
}
}
vector<ll> v;
for(auto &[x, c]: cnt) {
ll y = f(x, k);
if(calc(y, 1, k) == x){
v.push_back(x);
c++;
}
}
int ans = 0;
for(auto [_, c]: cnt){
if(c == m) ans++;
}
if(m == 1){
ll y = f(n, k);
ans += y;
for(auto [x, c]: cnt){
ll y = f(x, k);
if(calc(y, 1, k) == x) ans--;
}
}
cout << ans << endl;
// cout << naive(n, k, m) << endl;
}
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