結果

問題 No.1578 A × B × C
ユーザー milanis48663220
提出日時 2021-07-02 21:25:12
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 7 ms / 2,000 ms
コード長 3,048 bytes
コンパイル時間 1,713 ms
コンパイル使用メモリ 112,604 KB
最終ジャッジ日時 2025-01-22 15:38:29
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 * 3
other AC * 22
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 constructor ‘ModInt::ModInt(ll)’,
    inlined from ‘int main()’ at main.cpp:149:14:
main.cpp:29:26: warning: ‘<unnamed>.ModInt::v’ may be used uninitialized [-Wmaybe-uninitialized]
   29 |         if(_v < 0) _v = (v%MOD)+MOD;
      |                          ^
main.cpp: In function ‘int main()’:
main.cpp:149:20: note: ‘<anonymous>’ declared here
  149 |     mint p = mint(a)*b*c;
      |                    ^

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 MOD = 1000000007;
class ModInt{
    public:
    ll v;
    ModInt(ll _v = 0){
        if(_v < 0) _v = (v%MOD)+MOD;
        if(_v >= MOD) _v %= MOD;
        v = _v;
    }
    ModInt operator+(ll n){
        return ModInt((v+n)%MOD);
    }
    ModInt operator-(ll n){
        return ModInt((v-n+MOD)%MOD);
    }
    ModInt operator*(ll n){
        if(n >= MOD) n %= MOD;
        return ModInt((v*n)%MOD);
    }
    ModInt operator/(ll n){
        return ModInt((ModInt(n).inv()*v).v%MOD);
    }
    void operator+=(ll n){
        v = (v+n)%MOD;
    }
    void operator-=(ll n){
        v = (v-n+MOD)%MOD;
    }
    void operator*=(ll n){
        v = (v*n+MOD)%MOD;
    }
    
    
    ModInt operator+(ModInt n){
        return ModInt((v+n.v)%MOD);
    }
    ModInt operator-(ModInt n){
        return ModInt((v-n.v+MOD)%MOD);
    }
    ModInt operator*(ModInt n){
        return ModInt((v*n.v)%MOD);
    }
    ModInt operator/(ModInt n){
        return ModInt((n.inv()*v).v%MOD);
    }
    void operator+=(ModInt n){
        v = (v+n.v)%MOD;
    }
    void operator-=(ModInt n){
        v = (v-n.v+MOD)%MOD;
    }
    void operator*=(ModInt n){
        v = (v*n.v)%MOD;
    }
    void operator=(ModInt n){
        v = n.v;
    }
    bool operator==(ModInt n){
        return v == n.v;
    }
    bool operator!=(ModInt n){
        return v != n.v;
    }
    void operator=(ll n){
        v = n%MOD;
    }
    ModInt inv(){
        if(v == 1) return ModInt(1);
        else return ModInt(MOD-ModInt(MOD%v).inv().v*(MOD/v)%MOD);
    }
};
ostream& operator<<(ostream& os, const ModInt& m){
    os << m.v;
    return os;
}
istream & operator >> (istream &in,  ModInt &m){
    in >> m.v;
    return in;
}
ModInt pow(ModInt a, ll n) {
    assert(n >= 0);
    ModInt ans = 1;
    ModInt tmp = a;
    for (int i = 0; i <= 60; i++) {
        ll m = (ll)1 << i;
        if (m & n) {
        ans *= tmp;
        }
        tmp *= tmp;
    }
    return ans;
}
template <typename T>
T pow(T a, ll n, ll MOD) {
    T ans = 1;
    T tmp = a;
    for (int i = 0; i <= 60; i++) {
        ll m = (ll)1 << i;
        if (m & n) {
        ans *= tmp;
        ans %= MOD;
        }
        tmp *= tmp;
        tmp %= MOD;
    }
    return ans;
}
using mint = ModInt;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    ll a, b, c; cin >> a >> b >> c;
    ll k; cin >> k;
    ll x = pow(2ll, k, MOD-1);
    mint p = mint(a)*b*c;
    cout << pow(p, x) << endl;
}
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