結果

問題 No.1800 Random XOR
ユーザー 👑 emthrmemthrm
提出日時 2022-01-07 21:23:50
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 4,822 bytes
コンパイル時間 1,833 ms
コンパイル使用メモリ 198,488 KB
最終ジャッジ日時 2025-01-27 09:07:20
ジャッジサーバーID
(参考情報)
judge4 / judge2
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

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 1000000007;
// constexpr int MOD = 998244353;
constexpr int DY[]{1, 0, -1, 0}, DX[]{0, -1, 0, 1};
constexpr int DY8[]{1, 1, 0, -1, -1, -1, 0, 1}, DX8[]{0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U> inline bool chmax(T& a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U> inline bool chmin(T& a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
IOSetup() {
std::cin.tie(nullptr);
std::ios_base::sync_with_stdio(false);
std::cout << fixed << setprecision(20);
}
} iosetup;
template <int M>
struct MInt {
unsigned int val;
MInt(): val(0) {}
MInt(long long x) : val(x >= 0 ? x % M : x % M + M) {}
static constexpr int get_mod() { return M; }
static void set_mod(int divisor) { assert(divisor == M); }
static void init(int x = 10000000) { inv(x, true); fact(x); fact_inv(x); }
static MInt inv(int x, bool init = false) {
// assert(0 <= x && x < M && std::__gcd(x, M) == 1);
static std::vector<MInt> inverse{0, 1};
int prev = inverse.size();
if (init && x >= prev) {
// "x!" and "M" must be disjoint.
inverse.resize(x + 1);
for (int i = prev; i <= x; ++i) inverse[i] = -inverse[M % i] * (M / i);
}
if (x < inverse.size()) return inverse[x];
unsigned int a = x, b = M; int u = 1, v = 0;
while (b) {
unsigned int q = a / b;
std::swap(a -= q * b, b);
std::swap(u -= q * v, v);
}
return u;
}
static MInt fact(int x) {
static std::vector<MInt> f{1};
int prev = f.size();
if (x >= prev) {
f.resize(x + 1);
for (int i = prev; i <= x; ++i) f[i] = f[i - 1] * i;
}
return f[x];
}
static MInt fact_inv(int x) {
static std::vector<MInt> finv{1};
int prev = finv.size();
if (x >= prev) {
finv.resize(x + 1);
finv[x] = inv(fact(x).val);
for (int i = x; i > prev; --i) finv[i - 1] = finv[i] * i;
}
return finv[x];
}
static MInt nCk(int n, int k) {
if (n < 0 || n < k || k < 0) return 0;
if (n - k > k) k = n - k;
return fact(n) * fact_inv(k) * fact_inv(n - k);
}
static MInt nPk(int n, int k) { return n < 0 || n < k || k < 0 ? 0 : fact(n) * fact_inv(n - k); }
static MInt nHk(int n, int k) { return n < 0 || k < 0 ? 0 : (k == 0 ? 1 : nCk(n + k - 1, k)); }
static MInt large_nCk(long long n, int k) {
if (n < 0 || n < k || k < 0) return 0;
inv(k, true);
MInt res = 1;
for (int i = 1; i <= k; ++i) res *= inv(i) * n--;
return res;
}
MInt pow(long long exponent) const {
MInt tmp = *this, res = 1;
while (exponent > 0) {
if (exponent & 1) res *= tmp;
tmp *= tmp;
exponent >>= 1;
}
return res;
}
MInt &operator+=(const MInt &x) { if((val += x.val) >= M) val -= M; return *this; }
MInt &operator-=(const MInt &x) { if((val += M - x.val) >= M) val -= M; return *this; }
MInt &operator*=(const MInt &x) { val = static_cast<unsigned long long>(val) * x.val % M; return *this; }
MInt &operator/=(const MInt &x) { return *this *= inv(x.val); }
bool operator==(const MInt &x) const { return val == x.val; }
bool operator!=(const MInt &x) const { return val != x.val; }
bool operator<(const MInt &x) const { return val < x.val; }
bool operator<=(const MInt &x) const { return val <= x.val; }
bool operator>(const MInt &x) const { return val > x.val; }
bool operator>=(const MInt &x) const { return val >= x.val; }
MInt &operator++() { if (++val == M) val = 0; return *this; }
MInt operator++(int) { MInt res = *this; ++*this; return res; }
MInt &operator--() { val = (val == 0 ? M : val) - 1; return *this; }
MInt operator--(int) { MInt res = *this; --*this; return res; }
MInt operator+() const { return *this; }
MInt operator-() const { return MInt(val ? M - val : 0); }
MInt operator+(const MInt &x) const { return MInt(*this) += x; }
MInt operator-(const MInt &x) const { return MInt(*this) -= x; }
MInt operator*(const MInt &x) const { return MInt(*this) *= x; }
MInt operator/(const MInt &x) const { return MInt(*this) /= x; }
friend std::ostream &operator<<(std::ostream &os, const MInt &x) { return os << x.val; }
friend std::istream &operator>>(std::istream &is, MInt &x) { long long val; is >> val; x = MInt(val); return is; }
};
namespace std { template <int M> MInt<M> abs(const MInt<M> &x) { return x; } }
using ModInt = MInt<MOD>;
int main() {
ll n, m; cin >> n >> m;
cout << (ModInt(2).pow(m) - 1) / 2 << '\n';
return 0;
}
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