You have N integers, A1, A2, ... , AN. You need to deal with two kinds of operations. One type of operation is to add some given number to each number in a given interval. The other is to ask for the sum of numbers in a given interval.. You
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POJ3468：A Simple Problem with Integers （线段树||树状数组||Splay解决基本问题的效率对比）
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