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# Use Gists to store entire functions | |
class QuickSort | |
def self.sort!(keys) | |
quick(keys,0,keys.size-1) | |
end | |
private | |
def self.quick(keys, left, right) | |
if left < right | |
pivot = partition(keys, left, right) | |
quick(keys, left, pivot-1) | |
quick(keys, pivot+1, right) | |
end | |
keys | |
end | |
def self.partition(keys, left, right) | |
x = keys[right] | |
i = left-1 | |
for j in left..right-1 | |
if keys[j] <= x | |
i += 1 | |
keys[i], keys[j] = keys[j], keys[i] | |
end | |
end | |
keys[i+1], keys[right] = keys[right], keys[i+1] | |
i+1 | |
end | |
end |
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