## beta-recsys v0.1 版本发布啦！🎉🎉🎉

我们的 beta-recsys v0. 1 版本发布了！这是一个基于 pytorch 的推荐系统来源平台，我们致力于整合更多的推荐系统模型，为推荐系统这个社区提供一个公平比较的平台，同时推进代码的可复现性！**Github**: https://github.com/beta-team/beta-recsys

**teaser video:**https://vimeo.com/456391232

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我们的 beta-recsys v0. 1 版本发布了！这是一个基于 pytorch 的推荐系统来源平台，我们致力于整合更多的推荐系统模型，为推荐系统这个社区提供一个公平比较的平台，同时推进代码的可复现性！**Github**: https://github.com/beta-team/beta-recsys

**teaser video:**https://vimeo.com/456391232

There are `n`

different online courses numbered from `1`

to `n`

. You are given an array `courses`

where `courses [i] = [durationi, lastDayi]`

indicate that the `ith`

course should be taken **continuously** for `durationi`

days and must be finished before or on `lastDayi`

.

You will start on the `1st`

day and you cannot take two or more courses simultaneously.

Return *the maximum number of courses that you can take*.

Design a special dictionary which has some words and allows you to search the words in it by a prefix and a suffix.

Implement the `WordFilter`

class:

`WordFilter (string [] words)`

Initializes the object with the`words`

in the dictionary.`f (string prefix, string suffix)`

Returns*the index of the word in the dictionary*which has the prefix`prefix`

and the suffix`suffix`

. If there is more than one valid index, return**the largest**of them. If there is no such word in the dictionary, return`-1`

.

Given three integers `x`

, `y`

, and `bound`

, return *a list of all the powerful integers that have a value less than or equal to*

`bound`

.An integer is **powerful** if it can be represented as `xi + yj`

for some integers `i >= 0`

and `j >= 0`

.

You may return the answer in **any order**. In your answer, each value should occur **at most once**.

A robot is located at the top-left corner of a `m x n`

grid (marked ‘Start’ in the diagram below).

The robot can only move either down or right at any point in time. The robot is trying to reach the bottom-right corner of the grid (marked ‘Finish’ in the diagram below).

Now consider if some obstacles are added to the grids. How many unique paths would there be?

An obstacle and space is marked as `1`

and `0`

respectively in the grid.