結果

問題 No.811 約数の個数の最大化
ユーザー peroonperoon
提出日時 2019-04-19 11:40:10
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 104 ms / 2,000 ms
コード長 1,585 bytes
コンパイル時間 1,726 ms
コンパイル使用メモリ 174,080 KB
実行使用メモリ 6,944 KB
最終ジャッジ日時 2024-09-22 11:22:08
合計ジャッジ時間 2,611 ms
ジャッジサーバーID
(参考情報)
judge2 / judge5
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 * 12
権限があれば一括ダウンロードができます
コンパイルメッセージ
In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/istream:39,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/sstream:38,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/complex:45,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/ccomplex:39,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/x86_64-pc-linux-gnu/bits/stdc++.h:54,
                 from main.cpp:1:
In member function 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits<char>]',
    inlined from 'int main()' at main.cpp:84:5:
/home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.3.0/include/c++/12/ostream:202:25: warning: 'max_M' may be used uninitialized [-Wmaybe-uninitialized]
  202 |       { return _M_insert(__n); }
      |                ~~~~~~~~~^~~~~
main.cpp: In function 'int main()':
main.cpp:73:8: note: 'max_M' was declared here
   73 |     ll max_M;
      |        ^~~~~

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;
using ll = long long;
#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("Yes")
#define p_no() p("No")
const ll mod = 1e9 + 7;
const ll inf = 1e18;
ll gcd(ll a,ll b){
if(b == 0) return a;
return gcd(b,a%b);
}
map<ll, ll> factorize(ll n){
map<ll, ll> mp;
ll sq = sqrt(n);
FOR(i, 2, sq+1){
while(n%i==0){
mp[i]++;
n/=i;
}
}
//
if(n!=1){
mp[n]++;
}
return mp;
}
// () ex. {2, 2, 2, 3}
ll prime_factor_num(ll a){
ll count = 0;
auto mp = factorize(a);
for(auto p : mp){
count += p.second;
}
return count;
}
// a, b
ll common(ll a, ll b){
ll g = gcd(a, b);
return prime_factor_num(g);
}
//
ll divisor_num(ll a){
auto mp = factorize(a);
ll ret = 1;
for(auto p : mp){
ret *= (p.second + 1);
}
return ret;
}
int main(){
cin.tie(0);
ios::sync_with_stdio(false);
// input
ll N, K;
cin >> N >> K;
ll max_divisor_num = 0;
ll max_M;
FOR(i, 1, N){
if(common(i, N)>=K){
ll div = divisor_num(i);
if(div > max_divisor_num){
max_divisor_num = div;
max_M = i;
}
}
}
p(max_M);
return 0;
}
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