经过两次车主爽约，我对返程坐顺风车已经不抱希望。情急之下，只能赶紧打开铁路购票App。运气还算不错，返程当天的二等座只剩3张，我手忙脚乱地选座、填信息、提交订单，付款成功的那一刻，悬着的心才落地。还好没被顺风车耽误返程，不然真不知道该怎么赶回去上班。
“技防”还是不如“人防”
，详情可参考im钱包官方下载
printf("%-12s: 耗时%.3fms, 正确:%s\n",
We even tried building hierarchies with 2-3 levels, but the number of shortcuts grew too fast for higher levels if we generated a full graph inside each cluster.