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Primitive Ruby Disjoint-Set
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| class DSU | |
| def initialize(x) | |
| @array = Array.new(x) {|i| i } | |
| end | |
| def find(x) | |
| return x if @array[x] == x | |
| @array[x] = find(@array[x]) | |
| end | |
| def union(a, b) | |
| @array[find(a)] = @array[find(b)] | |
| end | |
| def sets | |
| @array.collect{ |i| find(i) }.uniq.length | |
| end | |
| end |
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