hello-algo/codes/ruby/chapter_greedy/max_product_cutting.rb
2024-05-08 18:38:35 +08:00

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=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