res[i] = stack.length ? stack.at(-1) : -1;
OPENCLAW_STATE_DIR 指向了一个你有权读写的本地目录。，详情可参考同城约会
，更多细节参见搜狗输入法下载
（五）伪造、变造船舶户牌，买卖或者使用伪造、变造的船舶户牌，或者涂改船舶发动机号码的。
Range queries ask "what's inside this box?" But sometimes the question is "what's nearest to this location?" This is the nearest neighbor problem, and you don't know how big your search radius should be. The nearest point might be right next to you or far away.，这一点在91视频中也有详细论述