Tifa's CP Library

:heavy_check_mark: gen (src/code/rand/gen.hpp)

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#ifndef TIFALIBS_RAND_GEN
#define TIFALIBS_RAND_GEN

#include "../util/util.hpp"

namespace tifa_libs::rand {

template <class Distri>
class Gen {
  std::conditional_t<sizeof(TPN Distri::result_type) <= 4, std::mt19937, std::mt19937_64> re;
  Distri dist;

 public:
  using random_engine = decltype(re);
  using distribution = Distri;
  using result_type = TPN Distri::result_type;

  CEXP Gen() : re(std::random_device{}()), dist() {}
  CEXP Gen(result_type a, result_type b) : re(std::random_device{}()), dist(a, b) {}

  CEXP void set_range(result_type a, result_type b) { dist = Distri(a, b); }
  CEXP random_engine& rand_eng() { return re; }
  CEXP Distri& distrib() { return dist; }
  void reset_seed() { re.seed((result_type)std::chrono::duration_cast<std::conditional_t<sizeof(TPN Distri::result_type) <= 4, std::chrono::seconds, std::chrono::nanoseconds>>(std::chrono::high_resolution_clock::now().time_since_epoch()).count()); }
  CEXP result_type operator()() { return dist(re); }
  result_type next() { return dist(re); }
};

}  // namespace tifa_libs::rand

#endif
#line 1 "src/code/rand/gen.hpp"



#line 1 "src/code/util/util.hpp"



#include <bits/stdc++.h>

#define CEXP constexpr
#define TPN typename
#define CR const&

#define cT_(...) std::conditional_t<sizeof(__VA_ARGS__) <= sizeof(size_t), __VA_ARGS__, __VA_ARGS__ CR>
#define fle_(T, i, l, r, ...) for (T i = (l), i##e = (r)__VA_OPT__(, ) __VA_ARGS__; i <= i##e; ++i)
#define flt_(T, i, l, r, ...) for (T i = (l), i##e = (r)__VA_OPT__(, ) __VA_ARGS__; i < i##e; ++i)

#ifdef ONLINE_JUDGE
#undef assert
#define assert(x) 42
#endif

using i8 = int8_t;
using i16 = int16_t;
using i32 = int32_t;
using i64 = int64_t;
using i128 = __int128_t;
using isz = ptrdiff_t;

using u8 = uint8_t;
using u16 = uint16_t;
using u32 = uint32_t;
using u64 = uint64_t;
using u128 = __uint128_t;
using usz = size_t;

using f32 = float;
using f64 = double;
using f128 = long double;

template <class T>
using ptt = std::pair<T, T>;
template <class T>
using pt3 = std::tuple<T, T, T>;
template <class T>
using pt4 = std::tuple<T, T, T, T>;

template <class E>
using itl = std::initializer_list<E>;
template <class T, usz N>
using arr = std::array<T, N>;
template <class T>
using vec = std::vector<T>;
template <class T>
using vvec = vec<vec<T>>;
template <class T>
using v3ec = vec<vvec<T>>;
template <class U, class T>
using vecp = vec<std::pair<U, T>>;
template <class U, class T>
using vvecp = vvec<std::pair<U, T>>;
template <class T>
using vecpt = vec<ptt<T>>;
template <class T>
using vvecpt = vvec<ptt<T>>;
template <class T>
using ptvec = ptt<vec<T>>;
template <class T>
using ptvvec = ptt<vvec<T>>;

template <class T, class C = std::less<T>>
using pq = std::priority_queue<T, vec<T>, C>;
template <class T>
using pqg = std::priority_queue<T, vec<T>, std::greater<T>>;

using strn = std::string;
using strnv = std::string_view;
template <class T, usz ext = std::dynamic_extent>
using spn = std::span<T const, ext>;

#define mk_(V, A, T) using V##A = V<T>;
#define mk(A, T) mk_(ptt, A, T) mk_(pt3, A, T) mk_(pt4, A, T) mk_(vec, A, T) mk_(vvec, A, T) mk_(v3ec, A, T) mk_(vecpt, A, T) mk_(vvecpt, A, T) mk_(ptvec, A, T) mk_(ptvvec, A, T) mk_(spn, A, T) mk_(itl, A, T)
mk(b, bool) mk(i, i32) mk(u, u32) mk(ii, i64) mk(uu, u64);
#undef mk
#undef mk_

using namespace std::literals;
CEXP i8 operator""_i8(unsigned long long x) { return (i8)x; }
CEXP i16 operator""_i16(unsigned long long x) { return (i16)x; }
CEXP i32 operator""_i32(unsigned long long x) { return (i32)x; }
CEXP i64 operator""_i64(unsigned long long x) { return (i64)x; }
CEXP isz operator""_iz(unsigned long long x) { return (isz)x; }

CEXP u8 operator""_u8(unsigned long long x) { return (u8)x; }
CEXP u16 operator""_u16(unsigned long long x) { return (u16)x; }
CEXP u32 operator""_u32(unsigned long long x) { return (u32)x; }
CEXP u64 operator""_u64(unsigned long long x) { return (u64)x; }
CEXP usz operator""_uz(unsigned long long x) { return (usz)x; }

inline const auto fn_0 = [](auto&&...) {};
inline const auto fn_is0 = [](auto x) { return x == 0; };

template <std::floating_point FP>
inline FP eps_v = std::sqrt(std::numeric_limits<FP>::epsilon());
template <std::floating_point FP>
CEXP void set_eps(FP v) { eps_v<FP> = v; }
using std::numbers::pi_v;

namespace tifa_libs {
using std::min, std::max, std::swap;
template <class T>
constexpr T abs(T x) { return x < 0 ? -x : x; }
}  // namespace tifa_libs


#line 5 "src/code/rand/gen.hpp"

namespace tifa_libs::rand {

template <class Distri>
class Gen {
  std::conditional_t<sizeof(TPN Distri::result_type) <= 4, std::mt19937, std::mt19937_64> re;
  Distri dist;

 public:
  using random_engine = decltype(re);
  using distribution = Distri;
  using result_type = TPN Distri::result_type;

  CEXP Gen() : re(std::random_device{}()), dist() {}
  CEXP Gen(result_type a, result_type b) : re(std::random_device{}()), dist(a, b) {}

  CEXP void set_range(result_type a, result_type b) { dist = Distri(a, b); }
  CEXP random_engine& rand_eng() { return re; }
  CEXP Distri& distrib() { return dist; }
  void reset_seed() { re.seed((result_type)std::chrono::duration_cast<std::conditional_t<sizeof(TPN Distri::result_type) <= 4, std::chrono::seconds, std::chrono::nanoseconds>>(std::chrono::high_resolution_clock::now().time_since_epoch()).count()); }
  CEXP result_type operator()() { return dist(re); }
  result_type next() { return dist(re); }
};

}  // namespace tifa_libs::rand


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