Billion
「题解」Codeforces 1427G One Billion Shades of Grey
感谢 127 的指导/ll \(|h_u-h_v|=\max(0,h_u-h_v)+\max(0,h_v-h_u)\)，那么可以把它看成这样的问题： \[\min \{\sum_{(u,v)}\max(0,h_u-h_v+w_{u,v})c_{u,v}\} \]对偶一下，问题就变为：如果两个格子相邻 ......
Pixie: A System for Recommending 3+ Billion Items to 200+ Million Users in Real-Time
目录概符号说明Pixie Eksombatchai C., Jindal P., Liu J. Z., Liu Y., Sharma R., Sugnet C., Ulrich M. and Leskovec J. Pixie: A system for recommending 3+ billio ......