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Re:雁过留声——树状数组的扩展应用In Reply To:雁过留声——树状数组的扩展应用 Posted by:fanhqme at 2009-11-22 20:18:20 sum{A[i]|i<=a}=sum{B1[i]|i<=a}+(sum{B2[i]|1<=i<=N}-sum{B2[i]|i<=a})*a
这式子怎么理解，看了半天老是看不懂，请指点指点
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