特朗普政府此番袭击伊朗之后，中东是否将陷入一场旷日持久的战争，已成为全球地缘政治棋局中一个不容忽视的不确定因素；但可以确定的是，在未来一个时间段内中东地区仍将是全球最不稳定的区域。
For the Poincaré half-space model in dimension 2, the metric evaluates on the coordinate tangent vectors \(\frac{\partial}{\partial x}, \frac{\partial}{\partial y} \in T_pM\) as \[g_p\!\left(\frac{\partial}{\partial x^i}\bigg|_p,\;\frac{\partial}{\partial x^j}\bigg|_p\right) = \frac{1}{y^2}\,\delta_{ij},\] i.e. the coordinate tangent vectors are orthogonal and each has length \(\frac{1}{y}\) — shrinking to zero as \(p\) approaches the boundary \(y\to 0\), which is what makes the space “infinitely large” near the boundary.
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有不少游客问我，蜡梅和梅花都带“梅”字，是同一种花还是同属近亲？
3. 对count做前缀和，得到每个值的最终位置，推荐阅读夫子获取更多信息