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Given a list of integers, made up of (hopefully) a small number of long runs
of consecutive integers, compute a representation of the form
((start1, end1), (start2, end2) ...). Then answer the question "was x present
in the original list?" in time O(log(# runs)).
i����Nc C s� t | � } g } d } x� t t | � � D]~ } | d t | � k rl | | | | d d k rl q+ ql n | | d | d !} | j t | d | d d � � | } q+ Wt | � S( s Represent a list of integers as a sequence of ranges:
((start_0, end_0), (start_1, end_1), ...), such that the original
integers are exactly those x such that start_i <= x < end_i for some i.
Ranges are encoded as single integers (start << 32 | end), not as tuples.
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