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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)).
éNcCsˆt|ƒ}g}d}tt|ƒƒD]b}|dt|ƒkrJ||||ddkrJq||d|d…}| t|d|ddƒ¡|}qt|ƒS)aRepresent 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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_decode_range"srcCszt|dƒ}t ||¡}|dkrNt||dƒ\}}||krF|krNnndS|t|ƒkrvt||ƒ\}}||krvdSdS)z=Determine if `int_` falls into one of the ranges in `ranges`.rrTF)rÚbisectZbisect_leftrr)Zint_r
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