implement hw 1

2018/IvanKarpechanka/1/hw.rb

@@ -0,0 +1,30 @@
+def fact(n)
+  (1..n).inject(1, :*)
+end
+
+def binom(n, k)
+  fact(n) / (fact(k) * fact(n - k))
+end
+
+def pascals_row(row, first_el)
+  (0..row).map { |line| first_el * binom(row, line) }
+end
+
+puts 'Введите глубину дерева:'
+three_len = gets.chomp.to_i
+puts 'Введите базовый номер:'
+first_el = gets.chomp.to_i
+number_max_len = pascals_row(three_len, first_el).max.to_s.length
+console_len = `tput cols`.to_i
+gaps = (' ' * number_max_len)
+help_str = "\/#{gaps}\\#{gaps}"
+(0..three_len).each do |i|
+  str = ''
+  pascals_row(i, first_el).each do |elem|
+    str += elem.to_s.rjust(number_max_len, '0') + (gaps + '  ')
+  end
+  help1 = ' ' * three_len.to_s.length
+  puts help1 + (help_str * i).chomp(gaps).center(console_len)
+  help2 = i.to_s.rjust(three_len.to_s.length, '0')
+  puts help2 + str.chomp(gaps + '  ').center(console_len, ',')
+end