⑥处应填()
(Dif[p] >> (r - p * b)) & ((1 << (r - l)) - 1)
Dif[p]
(Dif[p] >> (l - p * b)) & ((1 << (r - l)) - 1)
(Dif[p] >> ((p + 1) * b - r)) & ((1 << (r - l + 1)) - 1)
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