結果

問題 No.1350 2019-6problem
ユーザー ningenMe
提出日時 2021-01-17 13:13:11
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 4,350 bytes
コンパイル時間 2,016 ms
コンパイル使用メモリ 198,800 KB
最終ジャッジ日時 2025-01-18 00:18:46
ジャッジサーバーID
（参考情報） 		judge1 / judge3
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ファイルパターン 結果
sample AC * 3
other AC * 21
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;
using int128  = __int128_t;
using int64   = long long;
using int32   = int;
using uint128 = __uint128_t;
using uint64  = unsigned long long;
using uint32  = unsigned int;
#define ALL(obj) (obj).begin(),(obj).end()
template<class T> using priority_queue_reverse = priority_queue<T,vector<T>,greater<T>>;
constexpr int64 MOD = 1'000'000'000LL + 7; //'
constexpr int64 MOD2 = 998244353;
constexpr int64 HIGHINF = 1'000'000'000'000'000'000LL;
constexpr int64 LOWINF = 1'000'000'000'000'000LL; //'
constexpr long double PI = 3.1415926535897932384626433L;
template <class T> vector<T> multivector(size_t N,T init){return vector<T>(N,init);}
template <class... T> auto multivector(size_t N,T... t){return vector<decltype(multivector(t...))>(N,multivector(t...));}
template <class T> void corner(bool flg, T hoge) {if (flg) {cout << hoge << endl; exit(0);}}
template <class T, class U>ostream &operator<<(ostream &o, const map<T, U>&obj) {o << "{"; for (auto &x : obj) o << " {" << x.first << " : " << x
    .second << "}" << ","; o << " }"; return o;}
template <class T>ostream &operator<<(ostream &o, const set<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr != obj
    .begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const multiset<T>&obj) {o << "{"; for (auto itr = obj.begin(); itr != obj.end(); ++itr) o << (itr !
    = obj.begin() ? ", " : "") << *itr; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const vector<T>&obj) {o << "{"; for (int i = 0; i < (int)obj.size(); ++i)o << (i > 0 ? ", " : "") 
    << obj[i]; o << "}"; return o;}
template <class T>ostream &operator<<(ostream &o, const deque<T>&obj) {o << "{"; for (int i = 0; i < (int)obj.size(); ++i)o << (i > 0 ? ", " : "") << 
    obj[i]; o << "}"; return o;}
template <class T, class U>ostream &operator<<(ostream &o, const pair<T, U>&obj) {o << "{" << obj.first << ", " << obj.second << "}"; return o;}
void print(void) {cout << endl;}
template <class Head> void print(Head&& head) {cout << head;print();}
template <class Head, class... Tail> void print(Head&& head, Tail&&... tail) {cout << head << " ";print(forward<Tail>(tail)...);}
template <class T> void chmax(T& a, const T b){a=max(a,b);}
template <class T> void chmin(T& a, const T b){a=min(a,b);}
vector<string> split(const string &str, const char delemiter) {vector<string> res;stringstream ss(str);string buffer; while( getline(ss, buffer, 
    delemiter) ) res.push_back(buffer); return res;}
inline constexpr int msb(int x) {return x?31-__builtin_clz(x):-1;}
inline constexpr int64 ceil_div(const int64 a,const int64 b) {return (a+(b-1))/b;}// return ceil(a/b)
void YN(bool flg) {cout << (flg ? "YES" : "NO") << endl;}
void Yn(bool flg) {cout << (flg ? "Yes" : "No") << endl;}
void yn(bool flg) {cout << (flg ? "yes" : "no") << endl;}
/*
 * @title Gcd - 高速GCD
 * @docs md/math/Gcd.md
 */
class Gcd{
public:
    inline static long long impl(long long n, long long m) {
        static constexpr long long K = 5;
        long long t,s;
        for(int i = 0; t = n - m, s = n - m * K, i < 80; ++i) {
            if(t<m){
                if(!t) return m;
                n = m, m = t;
            }
            else{
                if(!m) return t;
                n=t;
                if(t >= m * K) n = s;
            }
        }
        return impl(m, n % m);
    }
    inline static long long pre(long long n, long long m) {
        long long t;
        for(int i = 0; t = n - m, i < 4; ++i) {
            (t < m ? n=m,m=t : n=t);
            if(!m) return n;
        }
        return impl(n, m);
    }
    inline static long long gcd(long long n, long long m) {
        return (n>m ? pre(n,m) : pre(m,n));
    }
    inline static constexpr long long pureGcd(long long a, long long b) {
        return (b ? pureGcd(b, a % b):a);
    }
    inline static constexpr long long lcm(long long a, long long b) {
        return (a*b ? (a / gcd(a, b)*b): 0);
    }
    inline static constexpr long long extGcd(long long a, long long b, long long &x, long long &y) {
        if (b == 0) return x = 1, y = 0, a;
        long long d = extGcd(b, a%b, y, x);
        return y -= a / b * x, d;
    }
};
/**
 * @url 
 * @est
 */ 
int main() {
    cin.tie(0);ios::sync_with_stdio(false);
    int64 A,B,K; cin >> A >> B >> K;
    int64 L = Gcd::lcm(A,B);
    int64 ok=HIGHINF,ng=0,md;
    while(ok-ng>1) {
        md = (ok+ng)>>1;
        int64 cnt = md/A + md/B - md/L;
        (cnt >= K?ok:ng)=md;
    }
    cout << ok << endl;
    return 0;
}
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