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Algorithm for creating a school timetable
...s heuristic. I named it "recursive swapping".
Input: a set of activities A_1...A_n and the constraints.
Output: a set of times TA_1...TA_n (the time slot of each activity. Rooms are excluded here, for simplicity). The algorithm must put each activity at a time slot, respecting constraints. Each TA...
how to rotate a bitmap 90 degrees
... source = BitmapFactory.decodeResource(this.getResources(), R.drawable.your_img);
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How to turn NaN from parseInt into 0 for an empty string?
...h for other stuff, there's a handy defaultTo function that does just this: _.defaultTo(NaN, -1) returns -1, but _.defaultTo(0, -1); returns 0.
– waldyrious
Dec 6 '18 at 12:40
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MediaNotification 媒体通知扩展：管理媒体播放器通知，支持播放控制 · Ap...
...eite.ursai2medianotification.aix
.aia示例文件：
UrsMediaNotification_3_1.aia
版本历史
版本
修改内容
1.0 (2021-05-05)
初始版本
1.1 (2021-07-11)
- 移除了 GetDuration 和 GetDurationS...
Simulate CREATE DATABASE IF NOT EXISTS for PostgreSQL?
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Restrictions
You can ask the system catalog pg_database - accessible from any database in the same database cluster. The tricky part is that CREATE DATABASE can only be executed as a single statement. The manual:
CREATE DATABASE cannot be executed inside a transaction b...
Samples of Scala and Java code where Scala code looks simpler/has fewer lines?
...the is prefix used for booleans. davetron5000.github.com/scala-style/naming_conventions/methods/…
– Esko Luontola
Jun 1 '10 at 20:40
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What do ellipsis […] mean in a list?
... For me, instead of "..." it shows "<Recursion on dict with id=___>"
– Solomon Ucko
Apr 17 '16 at 23:30
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Schema for a multilanguage database
...ng a related translation table for each translatable table?
CREATE TABLE T_PRODUCT (pr_id int, PRICE NUMBER(18, 2))
CREATE TABLE T_PRODUCT_tr (pr_id INT FK, languagecode varchar, pr_name text, pr_descr text)
This way if you have multiple translatable column it would only require a single join to g...
Pandas count(distinct) equivalent
...if I have multiple columns that I want to be unique together, like in .drop_duplicates(subset=['col1','col2'])?
– ErnestScribbler
Oct 2 '17 at 8:10
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How to set Python's default version to 3.x on OS X?
...on='python3'
in your ~/.profile, and then source ~/.profile in your ~/.bash_profile and/or your~/.zsh_profile with a line like:
[ -e ~/.profile ] && . ~/.profile
This way, your alias will work across shells.
With this, python command now invokes python3. If you want to invoke the "origi...