mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-26 11:16:28 +08:00
28 lines
721 B
Ruby
28 lines
721 B
Ruby
=begin
|
||
File: max_product_cutting.rb
|
||
Created Time: 2024-05-07
|
||
Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
|
||
=end
|
||
|
||
### 最大切分乘积:贪心 ###
|
||
def max_product_cutting(n)
|
||
# 当 n <= 3 时,必须切分出一个 1
|
||
return 1 * (n - 1) if n <= 3
|
||
# 贪心地切分出 3 ,a 为 3 的个数,b 为余数
|
||
a, b = n / 3, n % 3
|
||
# 当余数为 1 时,将一对 1 * 3 转化为 2 * 2
|
||
return (3.pow(a - 1) * 2 * 2).to_i if b == 1
|
||
# 当余数为 2 时,不做处理
|
||
return (3.pow(a) * 2).to_i if b == 2
|
||
# 当余数为 0 时,不做处理
|
||
3.pow(a).to_i
|
||
end
|
||
|
||
### Driver Code ###
|
||
if __FILE__ == $0
|
||
n = 58
|
||
|
||
# 贪心算法
|
||
res = max_product_cutting(n)
|
||
puts "最大切分乘积为 #{res}"
|
||
end
|