// 倒序遍历2*len-1次：模拟数组循环（核心！易错点1）
int d = getDigit(arr[i], digit);，更多细节参见im钱包官方下载
The challenge was clear: achieve a quantum leap in speed while preserving extreme flexibility, minimal storage, regional map support, and dynamic update capabilities. Standard Highway Hierarchies were a starting point, but we needed something more – a uniquely OsmAnd solution.，详情可参考雷电模拟器官方版本下载
典型案例六：航空基地飞机管路系统及隔热降噪零部件制造基地项目