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nwt-q/ACM-tutorial
二维数点又称二维偏序,它是这样一类问题,给出一个二维平面內的若干个点,多次询问某个矩形区域內包含多少个点(边界也算)。又或者,给一个长为 n 的序列,多次询问区间 $[ l , r ]$ 中值在 $[ x , y ]$ 内的元素个数。 lower_bound(arr.begin(),arr.end(),target) 用于 ...
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