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26 lines
494 B
Python
26 lines
494 B
Python
# Bisection algorithms
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# Insert item x in list a, and keep it sorted assuming a is sorted
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def insort(a, x, lo=0, hi=None):
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if hi is None:
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hi = len(a)
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while lo < hi:
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mid = (lo+hi)/2
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if x < a[mid]: hi = mid
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else: lo = mid+1
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a.insert(lo, x)
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# Find the index where to insert item x in list a, assuming a is sorted
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def bisect(a, x, lo=0, hi=None):
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if hi is None:
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hi = len(a)
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while lo < hi:
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mid = (lo+hi)/2
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if x < a[mid]: hi = mid
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else: lo = mid+1
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return lo
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