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#include "math/random.h"
#include "base_c/defs.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
using namespace indigo;
Random::Random()
{
randSeed = rand();
}
Random::Random(int seed)
{
randSeed = seed;
}
void Random::setSeed(unsigned long long x)
{
randSeed = x;
}
unsigned int Random::next()
{
// printf("%lld %lld \n", randSeed, 6364136223846793005LL);
randSeed = 6364136223846793005LL * randSeed + 1;
// printf("%lld %lld \n", randSeed, 6364136223846793005LL);
return (unsigned int)(randSeed >> 16);
}
unsigned int Random::next(int mod)
{
if (mod > 0)
return next() % mod;
if (mod < 0)
return -(next() % -mod);
return 0;
}
unsigned int Random::nextBounded(int l, int r)
{
return __min(l, r) + next(abs(r - l));
}
unsigned int Random::nextLarge(int mod)
{
int x = next();
if ((1LL << 32) - x > mod)
return x % mod;
int max = (1LL << 32) - (1LL << 32) % mod;
if (x < max)
return x % mod;
return nextLarge(mod);
}
unsigned long long Random::nextLong()
{
return ((unsigned long long)next() << 32) + next();
}
unsigned long long Random::nextLong(unsigned long long mod)
{
return nextLong() % mod;
}
double Random::nextDouble()
{
return 1.0 * next() / (1LL << 32);
}
double Random::nextDoubleBounded(double l, double r)
{
return __min(l, r) + nextDouble() * fabs(r - l);
}
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