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Point lookups are useful, but the operation you'll reach for more often is a range query: give the tree a rectangular region and retrieve every point inside it, without scanning the entire dataset.，更多细节参见同城约会
But handling that stuff is slow. To calculate a string’s width it can’t call len on the string. Instead it has to pass every character through a state machine.，更多细节参见Line官方版本下载
"pinned": false,，详情可参考同城约会