Created
July 11, 2024 16:42
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| class Partition | |
| include Enumerable | |
| attr_reader :arr, :k | |
| def initialize(arr, k) | |
| @arr = arr | |
| @k = k | |
| end | |
| def each | |
| all_partitions(@arr) { |partition| yield partition } | |
| end | |
| private | |
| def partition_set(set, index, ans, &block) | |
| if index == set.size | |
| yield ans.map(&:dup) if ans.size <= @k | |
| return | |
| end | |
| ans.each do |subset| | |
| subset << set[index] | |
| partition_set(set, index + 1, ans, &block) | |
| subset.pop | |
| end | |
| ans << [ set[index] ] | |
| partition_set(set, index + 1, ans, &block) | |
| ans.pop | |
| end | |
| def all_partitions(set, &block) | |
| partition_set(set, 0, [], &block) | |
| end | |
| end |
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