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27 lines
569 B
27 lines
569 B
def merge_sort(a):
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if len(a) < 2:
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return a
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l = a[0:len(a)//2]
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r = a[len(a)//2:]
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return merge(merge_sort(l), merge_sort(r))
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def merge(a, b):
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out = []
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i = 0
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j = 0
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while i < len(a) or j < len(b):
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if i >= len(a):
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out.append(b[j])
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j += 1
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elif j >= len(b):
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out.append(a[i])
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i += 1
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else:
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if a[i] <= b[j]:
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out.append(a[i])
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i += 1
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else:
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out.append(b[j])
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j += 1
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return out
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