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How to trace the path in a Breadth-First Search?

... You should have look at http://en.wikipedia.org/wiki/Breadth-first_search first. Below is a quick implementation, in which I used a list of list to represent the queue of paths. # graph is in adjacent list representation graph = { '1': ...
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What is the difference between join and merge in Pandas?

...1.join(df2) instead. Some notes on these issues from the documentation at http://pandas.pydata.org/pandas-docs/stable/merging.html#database-style-dataframe-joining-merging: merge is a function in the pandas namespace, and it is also available as a DataFrame instance method, with the calling D...
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How do I tell if a regular file does not exist in Bash?

... The test command ([ here) has a "not" logical operator which is the exclamation point (similar to many other languages). Try this: if [ ! -f /tmp/foo.txt ]; then echo "File not found!" fi ...
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What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?

...ion (N) of the highest set bit is the integer log base 2 of that integer. http://graphics.stanford.edu/~seander/bithacks.html#IntegerLogObvious unsigned int v; unsigned r = 0; while (v >>= 1) { r++; } This "obvious" algorithm may not be transparent to everyone, but when you realize th...
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classical inheritance vs prototypal inheritance in javascript

...esent in derived class.) Here is a good explanation to understand better (http://www.objectplayground.com/) share | improve this answer | follow | ...
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Browse orphaned commits in Git

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Rotated elements in CSS that affect their parent's height correctly

...; </div> <p>Even more text</p> <img src="https://i.stack.imgur.com/ih8Fj.png"> <div class="rotation-wrapper-outer"> <div class="rotation-wrapper-inner"> <img class="element-to-rotate" src="https://i.stack.imgur.com/ih8Fj.png"> ...
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ReactJS render string with non-breaking spaces

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How do I do a not equal in Django queryset filtering?

In Django model QuerySets, I see that there is a __gt and __lt for comparitive values, but is there a __ne / != / <> ( not equals ?) ...
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Merge up to a specific commit

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