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Is there a performance difference between i++ and ++i in C++?
... iterator would need to maintain some state, e.g. parent node, child node, index and stuff like that. All in all, my stance is, even if only few examples exist, ...
– Sebastian Mach
Jun 7 '15 at 20:16
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Calculate relative time in C#
...her languages, you will hate yourself for doing logic like this. Just so y'all know...
– Nik Reiman
May 23 '12 at 14:31
73
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How to declare an array in Python?
...nit with values (can contain mixed types)
arr = [1, "eels"]
# get item by index (can be negative to access end of array)
arr = [1, 2, 3, 4, 5, 6]
arr[0] # 1
arr[-1] # 6
# get length
length = len(arr)
# supports append and insert
arr.append(8)
arr.insert(6, 7)
Theoretical answer
Under the hood...
Is there a way to suppress warnings in Xcode?
...warnings:
#pragma unused(varname)
EDIT:
source: http://www.cocoadev.com/index.pl?XCodePragmas
UPDATE:
I came accross with a new solution, a more robust one
Open the Project > Edit Active Target> Build tab.
Under User-Defined: find (or create if you don't find one )the key : GCC_WARN_UNUS...
What are good examples of genetic algorithms/genetic programming solutions? [closed]
...e.g., alphabetized. Call this the reference solution. Think of a guest's index as his/her seat number.
Instead of trying to encode this ordering directly in the chromosome, we encode instructions for transforming the reference solution into a new solution. Specifically, we treat the chromosomes ...
How does a hash table work?
...ut the total memory usage is no worse - just more pointers NULL instead of indexing into the data usefully.
– Tony Delroy
Aug 31 '17 at 4:11
3
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Possible to perform cross-database queries with PostgreSQL?
...base. While this seems like unneeded duplication of data, it might help if indexes are required.
This can be done with simple on insert triggers which in turn call dblink to update another copy. There are also full-blown replication options (like Slony) but that's off-topic.
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Why is quicksort better than mergesort?
...eks to disk. For instance this is why it is standard advice that you drop indexes before doing large data loads in databases, and then rebuild the index later. Maintaining the index during the load means constantly seeking to disk. By contrast if you drop the indexes, then the database can rebuil...
How to escape special characters in building a JSON string?
...Tab
\" Double quote
\\ Backslash character
However, even if it is totally contrary to the spec, the author could use \'.
This is bad because :
It IS contrary to the specs
It is no-longer JSON valid string
But it works, as you want it or not.
For new readers, always use a double quote...
Does MySQL ignore null values on unique constraints?
...
note: this also works also unique indexes that have more columns. So if you want columns a, b and c to be unique you can still have in the table double rows with null, b, c
– Mihai Crăiță
Oct 13 '19 at 8:39
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