結果

問題 No.1800 Random XOR
ユーザー Zachary Chao
提出日時 2022-01-22 00:14:33
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 5,152 bytes
コンパイル時間 2,459 ms
コンパイル使用メモリ 197,900 KB
最終ジャッジ日時 2025-01-27 14:40:34
ジャッジサーバーID
（参考情報） 		judge2 / judge3
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 * 14
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>
#define sz(x) (int)(x).size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define uid uniform_int_distribution
#define uint unsigned int
#define ld long double
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define ar array
#define f first
#define s second
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define rint(l, r) uid<int>(l, r)(rng)
template<class T> using pq = priority_queue<T>;
template<class T> using pqg = priority_queue<T, vector<T>, greater<T>>;
template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.f); cerr << ','; __print(x.s); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
template <int MOD_> struct modnum {
    static constexpr int MOD = MOD_;
    int v;
    modnum() : v(0) {}
    modnum(ll v_) : v(int(v_ % MOD)) { if (v < 0) v += MOD; }
    explicit operator int() const { return v; }
    explicit operator bool() const { return v; }
    friend ostream& operator << (ostream& out, const modnum& n) { return out << int(n); }
    friend istream& operator >> (istream& in, modnum& n) { ll v_; in >> v_; n = modnum(v_); return in; }
    friend bool operator == (const modnum& a, const modnum& b) { return a.v == b.v; }
    friend bool operator != (const modnum& a, const modnum& b) { return a.v != b.v; }
    friend bool operator ! (const modnum &a) { return a.v == 0; }
    modnum operator- () const {
        return neg();
    }
    modnum operator+ () const {
        return modnum(*this);
    }
    modnum& operator ++ () {
        v++;
        if (v == MOD) v = 0;
        return *this;
    }
    modnum& operator -- () {
        if (v == 0) v = MOD;
        v--;
        return *this;
    }
    modnum& operator += (const modnum& o) {
        v -= MOD-o.v;
        v = (v < 0) ? v + MOD : v;
        return *this;
    }
    modnum& operator -= (const modnum& o) {
        v -= o.v;
        v = (v < 0) ? v + MOD : v;
        return *this;
    }
    modnum& operator *= (const modnum& o) {
        v = int((ll) v * o.v % MOD);
        return *this;
    }
    friend modnum binpow(modnum a, ll p) {
        if (p == 0) return 1;
        modnum ret = 1;
        for (; p; p /= 2, a *= a) if (p&1) ret *= a;
        return ret;
    }
    modnum inv() const {
        return binpow(*this, MOD-2);
    }
    friend modnum inv(const modnum& m) { return m.inv(); }
    modnum& operator /= (const modnum& o) {
        return *this *= o.inv();
    }
    modnum neg() const {
        modnum res;
        res.v = v ? MOD-v : 0;
        return res;
    }
    friend modnum neg(const modnum& m) { return m.neg(); }
    friend modnum operator ++ (modnum& a, int) { modnum r = a; ++a; return r; }
    friend modnum operator -- (modnum& a, int) { modnum r = a; --a; return r; }
    friend modnum operator + (const modnum& a, const modnum& b) { return modnum(a) += b; }
    friend modnum operator - (const modnum& a, const modnum& b) { return modnum(a) -= b; }
    friend modnum operator * (const modnum& a, const modnum& b) { return modnum(a) *= b; }
    friend modnum operator / (const modnum& a, const modnum& b) { return modnum(a) /= b; }
};
const int mod = 1e9+7;
using mint = modnum<mod>;
void __print(mint x) {cerr << x;}
vector<mint> facs, invfacs;
mint choose(const mint &a, const mint &b) {
    int _a = (int)a, _b = (int)b;
    if (_b > _a || _a < 0 || _b < 0) return 0;
    return facs[_a] * invfacs[_b] * invfacs[_a-_b];
}
void finit(const int nx) {
    facs.resize(nx+1);
    invfacs.resize(nx+1);
    facs[0] = facs[1] = invfacs[0] = invfacs[1] = 1;
    for (int i = 2; i <= nx; i++) {
        facs[i] = facs[i-1] * i;
    }
    invfacs[nx] = inv(facs[nx]);
    for (int i = nx-1; i > 1; i--) {
        invfacs[i] = invfacs[i+1] * (i+1);
    }
}
void test_case() { 
    ll n, m; cin >> n >> m;
    cout << (binpow(mint(2), m)-1)/2;
}
int main() {
    cin.tie(0)->sync_with_stdio(0);
    int t = 1;
//    cin >> t;
    while (t--) test_case();
}
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