Хешове и keyword аргументи на блокове

Програмиране с Ruby

Курс във Факултета по Математика и Информатика към СУ

Решение на Трета задача от Мария Рангелова

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Към профила на Мария Рангелова

Резултати

  • 6 точки от тестове
  • 0 бонус точки
  • 6 точки общо
  • 20 успешни тест(а)
  • 0 неуспешни тест(а)

Код

class Integer
def prime?
return false if self < 2
2.upto(Math.sqrt(self)).all? { |divisor| (self % divisor).nonzero? }
end
end
class RationalSequence
include Enumerable
def initialize(size)
@size = size
end
def each_rational_number(&block)
(2..Float::INFINITY).map { |number| rationals_with_equal_sum_of_fraction_parts(number, &block) }
end
def rationals_with_equal_sum_of_fraction_parts(sum, &block)
sum.odd? ? (numerator, denominator = sum - 1, 1) : (numerator, denominator = 1, sum - 1)
until numerator.zero? or denominator.zero?
yield Rational(numerator, denominator) if numerator.gcd(denominator) == 1
if sum.odd?
numerator -= 1
denominator += 1
else
numerator += 1
denominator -= 1
end
end
end
def each
enum_for(:each_rational_number).lazy.take(@size).each { |n| yield n }
end
end
class FibonacciSequence
include Enumerable
def initialize(size, first: 1, second: 1)
@size = size
@first = first
@second = second
end
def each_fibonacci_number
previous, current = @first, @second
yield previous
loop do
yield current
previous, current = current, current + previous
end
end
def each
enum_for(:each_fibonacci_number).lazy.take(@size).each { |n| yield n }
end
end
class PrimeSequence
include Enumerable
def initialize(size)
@size = size
end
def each
(1..Float::INFINITY).lazy.select(&:prime?).take(@size).each { |n| yield n }
end
end
module DrunkenMathematician
module_function
def meaningless(n)
RationalSequence.new(n).to_a
.partition { |rational| rational.numerator.prime? or rational.denominator.prime? }
.map { |n| n.reduce(1,:*) }.reduce(&:/)
end
def aimless(n)
prime_sequence = n.even? ? PrimeSequence.new(n).to_a : PrimeSequence.new(n).to_a << 1
prime_sequence.each_slice(2).map { |numerator, denominator| Rational(numerator, denominator) }
.reduce(0,:+)
end
def first_n_rationals_sum(n)
RationalSequence.new(n).reduce(0,:+)
end
def worthless(n)
n_fibonacci_number = FibonacciSequence.new(n).to_a.last
max_section_length = (1..Float::INFINITY).lazy
.take_while { |n| first_n_rationals_sum(n) <= n_fibonacci_number }
.to_a.last
RationalSequence.new(max_section_length).to_a
end
end

Лог от изпълнението

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Finished in 0.12817 seconds
20 examples, 0 failures

История (1 версия и 1 коментар)

Мария обнови решението на 26.10.2015 00:07 (преди над 9 години)

+class Integer
+ def prime?
+ return false if self < 2
+ 2.upto(Math.sqrt(self)).all? { |divisor| (self % divisor).nonzero? }
+ end
+end
+
+class RationalSequence
+ include Enumerable
+
+ def initialize(size)
+ @size = size
+ end
+
+ def each_rational_number(&block)
+ (2..Float::INFINITY).map { |number| rationals_with_equal_sum_of_fraction_parts(number, &block) }
+ end
+
+ def rationals_with_equal_sum_of_fraction_parts(sum, &block)
+ sum.odd? ? (numerator, denominator = sum - 1, 1) : (numerator, denominator = 1, sum - 1)
+
+ until numerator.zero? or denominator.zero?
+ yield Rational(numerator, denominator) if numerator.gcd(denominator) == 1
+
+ if sum.odd?
+ numerator -= 1
+ denominator += 1
+ else
+ numerator += 1
+ denominator -= 1
+ end
+ end
+ end
+
+ def each
+ enum_for(:each_rational_number).lazy.take(@size).each { |n| yield n }
+ end
+end
+
+class FibonacciSequence
+ include Enumerable
+
+ def initialize(size, first: 1, second: 1)
+ @size = size
+ @first = first
+ @second = second
+ end
+
+ def each_fibonacci_number
+ previous, current = @first, @second
+ yield previous
+
+ loop do
+ yield current
+ previous, current = current, current + previous
+ end
+ end
+
+ def each
+ enum_for(:each_fibonacci_number).lazy.take(@size).each { |n| yield n }
+ end
+end
+
+class PrimeSequence
+ include Enumerable
+
+ def initialize(size)
+ @size = size
+ end
+
+ def each
+ (1..Float::INFINITY).lazy.select(&:prime?).take(@size).each { |n| yield n }
+ end
+end
+
+module DrunkenMathematician
+ module_function
+
+ def meaningless(n)
+ RationalSequence.new(n).to_a
+ .partition { |rational| rational.numerator.prime? or rational.denominator.prime? }
+ .map { |n| n.reduce(1,:*) }.reduce(&:/)
+ end
+
+ def aimless(n)
+ prime_sequence = n.even? ? PrimeSequence.new(n).to_a : PrimeSequence.new(n).to_a << 1
+ prime_sequence.each_slice(2).map { |numerator, denominator| Rational(numerator, denominator) }
+ .reduce(0,:+)
+ end
+
+ def first_n_rationals_sum(n)
+ RationalSequence.new(n).reduce(0,:+)
+ end
+
+ def worthless(n)
+ n_fibonacci_number = FibonacciSequence.new(n).to_a.last
+ max_section_length = (1..Float::INFINITY).lazy
+ .take_while { |n| first_n_rationals_sum(n) <= n_fibonacci_number }
+ .to_a.last
+ RationalSequence.new(max_section_length).to_a
+ end
+end