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Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
...1k + a2k + ... + akk = bk
Using Newton's identities, knowing bi allows to compute
c1 = a1 + a2 + ... ak
c2 = a1a2 + a1a3 + ... + ak-1ak
...
ck = a1a2 ... ak
If you expand the polynomial (x-a1)...(x-ak) the coefficients will be exactly c1, ..., ck - see Viète's formulas. Since every polynomial...
How do I get python's pprint to return a string instead of printing?
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The pprint module has a command named pformat, for just that purpose.
From the documentation:
Return the formatted representation of object as a string. indent,
width and depth will be passed to the PrettyPrinter constructor as
formatting p...
Keep the window's name fixed in tmux
... rename it. But after I renaming it, they keep changing when I execute the commands.
4 Answers
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How do I create a pylintrc file
...t>
Also notice when generating the rc file, you may add option on the command line before the --generate-rcfile, they will be considered in the generated file.
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What does @hide mean in the Android source code?
...APIs that are not accessible via SDK.
The first one is located in package com.android.internal. The second API type is a collection of classes and methods that are marked with the @hide Javadoc attribute.
Starting from Android 9 (API level 28), Google introduces new restrictions on the use of no...
jQuery validate: How to add a rule for regular expression validation?
...istance.de/jquery-plugins/jquery-plugin-validation/
http://ajax.aspnetcdn.com/ajax/jquery.validate/1.9/additional-methods.js
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Converting String array to java.util.List
...ist is partly unmodifiable, you can't add or delete elements. But the time complexity is O(1).
If you want a modifiable a List:
List<String> strings =
new ArrayList<String>(Arrays.asList(new String[]{"one", "two", "three"}));
This will copy all elements from the source array in...
Does Ruby regular expression have a not match operator like “!~” in Perl?
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