UVA12420 Item-Based Recommendation

Description

[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=279&page=show_problem&problem=3851 [PDF](https://uva.onlinejudge.org/external/124/p12420.pdf) ![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12420/2527e640b4eeee875758d222323049503aa1b631.png)

Input Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12420/49b0fd5b8cc02d386b472f2f055168981140a2f3.png)

Output Format

![](https://cdn.luogu.com.cn/upload/vjudge_pic/UVA12420/41168c8793db112c3770e65261559220da74a327.png)