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Convert two lists into a dictionary
...onary)
{'a': 1, 'b': 2, 'c': 3}
Voila :-) The pairwise dict constructor and zip function are awesomely useful: https://docs.python.org/3/library/functions.html#func-dict
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What happens when a duplicate key is put into a HashMap?
...e times to HashMap ’s put method, what happens to the original value? And what if even the value repeats? I didn’t find any documentation on this.
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Sort a Map by values
I am relatively new to Java, and often find that I need to sort a Map<Key, Value> on the values.
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Sorting multiple keys with Unix sort
...s that need to be sorted by 1-n keys. Some of these keys might be numeric and some of them might not be. This is a fixed-width columnar file so there are no delimiters.
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How does this print “hello world”?
...th this codification scheme you can have all 26 (one case) english letters and 6 symbols (being space among them).
Algorithm description
The >>= 5 in the for-loop jumps from group to group, then the 5-bits group gets isolated ANDing the number with the mask 31₁₀ = 11111₂ in the sentenc...
Is there any pythonic way to combine two dicts (adding values for keys that appear in both)?
...ith them you'd normally do with that type, such as iterate over their keys and values.
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How can I convert a dictionary into a list of tuples?
...ew" into the dictionary items. See the What's New document for Python 3.0, and the new documentation on views.
1: Insertion-order preservation for dicts was added in Python 3.7
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What are the differences between a multidimensional array and an array of arrays in C#?
What are the differences between multidimensional arrays double[,] and array-of-arrays double[][] in C#?
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What is memoization and how can I use it in Python?
I just started Python and I've got no idea what memoization is and how to use it. Also, may I have a simplified example?
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Cluster analysis in R: determine the optimal number of clusters
..., calinski.best, "\n")
# 5 clusters!
Four. Determine the optimal model and number of clusters according to the Bayesian Information Criterion for expectation-maximization, initialized by hierarchical clustering for parameterized Gaussian mixture models
# See http://www.jstatsoft.org/v18/i06/pap...