描述：n 个人排成一列，heights[i] 为第 i 个人的高度（互不相同）。第 i 个人能「看到」右侧第 j 个人的条件是：i < j 且两人之间所有人都比他们矮。返回 answer[i] 为第 i 个人在右侧能看到的人数。
The kernel is the shared surfaceWhen any code runs on Linux, it interacts with the hardware through the kernel via system calls. The Linux kernel exposes roughly 340 syscalls, and the kernel implementation is tens of millions of lines of C code. Every syscall is an entry point into that codebase.，详情可参考下载安装 谷歌浏览器 开启极速安全的 上网之旅。
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Every point gets examined, regardless of where it sits. Points on the opposite side of the map get the same treatment as points right next to the query region. We're doing a lot of unnecessary work.