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from random import randint
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from tempfile import TemporaryFile
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import numpy as np
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def _in_place_quick_sort(a, start, end):
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count = 0
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if start < end:
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pivot = randint(start, end)
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temp = a[end]
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a[end] = a[pivot]
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a[pivot] = temp
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p, count = _in_place_partition(a, start, end)
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count += _in_place_quick_sort(a, start, p - 1)
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count += _in_place_quick_sort(a, p + 1, end)
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return count
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def _in_place_partition(a, start, end):
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count = 0
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pivot = randint(start, end)
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temp = a[end]
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a[end] = a[pivot]
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a[pivot] = temp
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new_pivot_index = start - 1
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for index in range(start, end):
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count += 1
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if a[index] < a[end]: # check if current val is less than pivot value
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new_pivot_index = new_pivot_index + 1
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temp = a[new_pivot_index]
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a[new_pivot_index] = a[index]
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a[index] = temp
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temp = a[new_pivot_index + 1]
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a[new_pivot_index + 1] = a[end]
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a[end] = temp
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return new_pivot_index + 1, count
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outfile = TemporaryFile()
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p = 100 # 1000 elements are to be sorted
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mu, sigma = 0, 1 # mean and standard deviation
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X = np.random.normal(mu, sigma, p)
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np.save(outfile, X)
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print("The array is")
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print(X)
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outfile.seek(0) # using the same array
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M = np.load(outfile)
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r = len(M) - 1
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z = _in_place_quick_sort(M, 0, r)
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print(
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"No of Comparisons for 100 elements selected from a standard normal distribution"
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"is :"
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)
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print(z)
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