Названа исполнительница роли Наташи Ростовой в «Войне и мире» Андреасяна14:45
// 易错点1：边界处理 - 0辆车返回0，1辆车返回1（无需后续计算）
，更多细节参见safew官方版本下载
Lead vehicle takes top-three off main course
The points all fit in some semicircle exactly when at least one of these events occurs. We want the probability of the union E1∪E2∪⋯∪ENE_1 \cup E_2 \cup \cdots \cup E_NE1∪E2∪⋯∪EN. If we could just add them, we would get: