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Explain Morris inorder tree traversal without using stacks or recursion
... / \
(Y) Z
/ \
C D
(Y) above refers to Y and all of its children, which are omitted for recursion issues. The important part is listed anyway.
Now that the tree has a link back to X, the traversal continues...
A
\
Y
/ \
(A) B
\
X
/ \
(Y)...
How do I Search/Find and Replace in a standard string?
Is there a way to replace all occurrences of a substring with another string in std::string ?
9 Answers
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How to validate a url in Python? (Malformed or not)
...
Actually, I think this is the best way.
from django.core.validators import URLValidator
from django.core.exceptions import ValidationError
val = URLValidator(verify_exists=False)
try:
val('http://www.google.com')
except Val...
ThreadStatic v.s. ThreadLocal: is generic better than attribute?
...low is the simple demonstration:
public static ThreadLocal<int> _threadlocal =
new ThreadLocal<int>(() =>
{
return Thread.CurrentThread.ManagedThreadId;
});
public static void Main()
{
new Thread(() =>
{
...
Center image in div horizontally [duplicate]
.../* for the img inside your div */
display: block;
margin: 0 auto;
That's all.
Note, that you'll also have to set an initial min-width for your outer div.
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Why do people write the #!/usr/bin/env python shebang on the first line of a Python script?
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If you have several versions of Python installed, /usr/bin/env will ensure the interpreter used is the first one on your environment's $PATH. The alternative would be to hardcode something like #!/usr/bin/python; that's ok, but less flexible.
In Unix, an executable f...
Update multiple columns in SQL
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i think use 1keydata.com/sql/sqlupdate.html "SET column_1 = [value1], column_2 = [value2]"
– DeLe
Jun 9 '13 at 1:01
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Regular Expression For Duplicate Words
...)\s+\b\1\b/
A good selection of test strings can be found here: http://callumacrae.github.com/regex-tuesday/challenge1.html
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How to get all possible combinations of a list’s elements?
...ave a list with 15 numbers in, and I need to write some code that produces all 32,768 combinations of those numbers.
27 An...
Difference between EXISTS and IN in SQL?
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The exists keyword can be used in that way, but really it's intended as a way to avoid counting:
--this statement needs to check the entire table
select count(*) from [table] where ...
--this statement is true as soon as one match is found
exists ( select * from [table] ...