回答編集履歴
4
テキスト修正
answer
CHANGED
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@@ -1,21 +1,23 @@
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1
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-
再帰を使って
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1
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+
再帰を使ってやってみました。
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2
2
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3
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+
（※以下のコードで、メソッド名 `base_of_pascals_triangle` は、「[パスカルの三角形](https://ja.wikipedia.org/wiki/%E3%83%91%E3%82%B9%E3%82%AB%E3%83%AB%E3%81%AE%E4%B8%89%E8%A7%92%E5%BD%A2)の底辺」の意）
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4
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+
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3
5
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> [ykt68@macbook15]$ ruby -v
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4
6
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ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin17]
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5
7
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[ykt68@macbook15]$ cat tera118837.rb
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6
8
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```ruby
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7
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-
def
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9
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+
def base_of_pascals_triangle(n)
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8
10
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if n == 1
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9
11
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[1]
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10
12
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else
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11
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-
prev =
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13
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+
prev = base_of_pascals_triangle(n-1)
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12
14
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(0...n).map do |i|
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13
15
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(i > 0 ? prev[i-1] : 0) + ( i < prev.length ? prev[i] : 0)
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14
16
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end
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15
17
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end
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16
18
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end
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17
19
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18
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-
puts "#{
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20
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+
puts "#{base_of_pascals_triangle(6)}"
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19
21
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```
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20
22
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> [ykt68@macbook15]$ ruby tera118837.rb
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21
23
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**[1, 5, 10, 10, 5, 1]**
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3
テキスト修正
answer
CHANGED
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@@ -17,6 +17,6 @@
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17
17
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18
18
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puts "#{numbers(6)}"
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19
19
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```
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20
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-
> [ykt68@macbook15]$ ruby
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20
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+
> [ykt68@macbook15]$ ruby tera118837.rb
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21
21
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**[1, 5, 10, 10, 5, 1]**
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22
22
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[ykt68@macbook15]$
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2
テキスト修正
answer
CHANGED
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@@ -5,14 +5,14 @@
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5
5
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[ykt68@macbook15]$ cat tera118837.rb
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6
6
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```ruby
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7
7
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def numbers(n)
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8
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-
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8
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+
if n == 1
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9
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-
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9
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+
[1]
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10
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-
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10
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+
else
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11
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-
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11
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+
prev = numbers(n-1)
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12
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-
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12
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+
(0...n).map do |i|
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13
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-
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13
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+
(i > 0 ? prev[i-1] : 0) + ( i < prev.length ? prev[i] : 0)
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14
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+
end
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14
15
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end
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15
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-
end
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16
16
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end
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17
17
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18
18
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puts "#{numbers(6)}"
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1
テキスト修正
answer
CHANGED
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@@ -9,7 +9,7 @@
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9
9
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[1]
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10
10
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else
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11
11
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prev = numbers(n-1)
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12
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-
(0...n).
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12
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+
(0...n).map do |i|
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13
13
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(i > 0 ? prev[i-1] : 0) + ( i < prev.length ? prev[i] : 0)
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14
14
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end
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15
15
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end
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