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Explain the use of a bit vector for determining if all characters are unique
... (flag). Each bit in your code states whether the character with bit's index was found in string or not. You could use bit vector for the same reason instead of int. There are two differences between them:
Size. int has fixed size, usually 4 bytes which means 8*4=32 bits (flags). Bit vector usuall...
What is the difference between LL and LR parsing?
Can anyone give me a simple example of LL parsing versus LR parsing?
5 Answers
5
...
Enable access control on simple HTTP server
...RS header for every response.
With the shebang at the top, make the file executable and put it into your PATH, and you can just run it using simple-cors-http-server.py too.
Python 3 solution
Python 3 uses SimpleHTTPRequestHandler and HTTPServer from the http.server module to run the server:
#!/u...
How to test my servlet using JUnit
...ssert.*;
import static org.mockito.Mockito.*;
import java.io.*;
import javax.servlet.http.*;
import org.apache.commons.io.FileUtils;
import org.junit.Test;
public class TestMyServlet extends Mockito{
@Test
public void testServlet() throws Exception {
HttpServletRequest request = mo...
How do I change Bootstrap 3 column order on mobile layout?
I'm making a responsive layout with a top fixed navbar. Underneath I have two columns, one for a sidebar (3), and one for content (9). Which on desktop looks like this
...
How do I (or can I) SELECT DISTINCT on multiple columns?
... FROM t GROUP BY a,b,c
It's a good idea to get used to the GROUP BY syntax, as it's more powerful.
For your query, I'd do it like this:
UPDATE sales
SET status='ACTIVE'
WHERE id IN
(
SELECT id
FROM sales S
INNER JOIN
(
SELECT saleprice, saledate
FROM sales
...
Conveniently Declaring Compile-Time Strings in C++
...Scott Schurr's str_const presented at C++ Now 2012. It does require constexpr though.
Here's how you can use it, and what it can do:
int
main()
{
constexpr str_const my_string = "Hello, world!";
static_assert(my_string.size() == 13, "");
static_assert(my_string[4] == 'o', "");
con...
What's the difference between EscapeUriString and EscapeDataString?
...
I didn't find the existing answers satisfactory so I decided to dig a little deeper to settle this issue. Surprisingly, the answer is very simple:
There is (almost) no valid reason to ever use Uri.EscapeUriString. If you need to percent-encode ...
C++ Modules - why were they removed from C++0x? Will they be back later on?
I just discovered this old C++0x draft about modules in C++0x.
4 Answers
4
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How do I obtain a Query Execution Plan in SQL Server?
In Microsoft SQL Server how can I get a query execution plan for a query / stored procedure?
12 Answers
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