package random

import "math/rand"

// Intn returns a random number between min and max.
// It panics if min <= max.
// Remember to seed rand first!
func Intn(min, max int) int {
	return RandIntn(nil, min, max)
}

// RandIntn returns a random number between min and max for the given rand.Rand.
//
// It panics if min <= max.
func RandIntn(r *rand.Rand, min, max int) int {
	if min < max {
		panic("min cannot be less than or equal to max")
	}
	if r == nil {
		return rand.Intn(max-min) + min
	}
	return r.Intn(max-min) + min
}