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How to determine the longest increasing subsequence using dynamic programming?
...tEnd in a loop using prev[bestEnd]. The -1 value is a sign to stop.
OK, now to the more efficient O(N log N) solution:
Let S[pos] be defined as the smallest integer that ends an increasing sequence of length pos. Now iterate through every integer X of the input set and do the following:
If X &...
How to convert a number to string and vice versa in C++
... edited Feb 17 '15 at 17:34
KnowItAllWannabe
11k66 gold badges3838 silver badges8484 bronze badges
answered Jun 18 '12 at 19:36
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How to get current path with query string using Capybara
...ests for a legacy application. Using current_path.should == is working for now (though I need to add a trailing forward-slash as a string). I'm thanking you in advance for code I'll likely need.
– Tass
Aug 19 '11 at 21:16
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Getting MAC Address
...module can be used and the only method under Linux I could find was to run ifconfig and run a regex across its output. I don't like using a package that only works on one OS, and parsing the output of another program doesn't seem very elegant not to mention error prone.
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JS: Check if date is less than 1 hour ago?
...(date) => {
const HOUR = 1000 * 60 * 60;
const anHourAgo = Date.now() - HOUR;
return date > anHourAgo;
}
Using the Moment library:
const lessThanOneHourAgo = (date) => {
return moment(date).isAfter(moment().subtract(1, 'hours'));
}
Shorthand syntax with Moment:
const ...
Remove duplicate elements from array in Ruby
...
no, the uniq! method will return nil if the array had been unique yet Ex: a = [1,2,3,4] a.uniq -> [1,2,3,4] but a.uniq! -> nil
– duykhoa
Apr 4 '13 at 8:37
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Split (explode) pandas dataframe string entry to separate rows
...1 var2 var3
0 [a, b, c] 1 XX
1 [d, e, f, x, y] 2 ZZ
Now we can do this:
In [181]: pd.DataFrame({
...: col:np.repeat(x[col].values, x[lst_col].str.len())
...: for col in x.columns.difference([lst_col])
...: }).assign(**{lst_col:np.concatenate(x[lst_col]....
Go Error Handling Techniques [closed]
...red IMHO. However complaining is forbidden, so I'll just drink my kool-aid now ;-)
– Thomas
Jan 1 '14 at 5:28
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show 2 more comments
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How to check if a process id (PID) exists
...s -p $PID > /dev/null
then
echo "$PID is running"
# Do something knowing the pid exists, i.e. the process with $PID is running
fi
The problem with:
kill -0 $PID
is the exit code will be non-zero even if the pid is running and you dont have permission to kill it. For example:
kill -0 1...
Better way to sum a property value in an array
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thanks @sp00m now I have changed my implementation with array.reduce just like gruff-bunny answered.
– nramirez
Apr 23 '14 at 18:49
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