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Why is XOR the default way to combine hashes?
...om (1-bit) inputs, the AND function output probability distribution is 75% 0 and 25% 1. Conversely, OR is 25% 0 and 75% 1.
The XOR function is 50% 0 and 50% 1, therefore it is good for combining uniform probability distributions.
This can be seen by writing out truth tables:
a | b | a AND b
---+...
How to split a string and assign it to variables
...ort (
"fmt"
"strings"
)
func main() {
s := strings.Split("127.0.0.1:5432", ":")
ip, port := s[0], s[1]
fmt.Println(ip, port)
}
Output:
127.0.0.1 5432
One step, for example,
package main
import (
"fmt"
"net"
)
func main() {
host, port, err := net.SplitHostPort...
Regular expression for floating point numbers
...
TL;DR
Use [.] instead of \. and [0-9] instead of \d to avoid escaping issues in some languages (like Java).
Thanks to the nameless one for originally recognizing this.
One relatively simple pattern for matching a floating point number is
[+-]?([0-9]*[.])...
SVG get text element width
...|
edited Jan 21 '13 at 18:04
RobM
7,08722 gold badges3838 silver badges3636 bronze badges
answered Oct 2...
Spring RestTemplate - how to enable full debugging/logging of requests/responses?
... |
edited Oct 24 '18 at 8:00
answered Oct 8 '15 at 7:54
sof...
How do I get indices of N maximum values in a NumPy array?
... |
edited Aug 2 '11 at 10:45
answered Aug 2 '11 at 10:32
...
Why does the order of the loops affect performance when iterating over a 2D array?
...
605
As others have said, the issue is the store to the memory location in the array: x[i][j]. Here'...
Finding sum of elements in Swift array
...d.
Swift 3 and Swift 4:
let multiples = [...]
let sum = multiples.reduce(0, +)
print("Sum of Array is : ", sum)
Swift 2:
let multiples = [...]
sum = multiples.reduce(0, combine: +)
Some more info:
This uses Array's reduce method (documentation here), which allows you to "reduce a collectio...
How to find all combinations of coins when given some dollar value
...r any other convenient computer algebra system) to compute the answer for 10^10^6 dollars in a couple seconds in three lines of code.
(And this was long enough ago that that’s a couple of seconds on a 75Mhz Pentium...)
sh...
Are members of a C++ struct initialized to 0 by default?
... constructors
struct Snapshot {
int x;
double y;
Snapshot():x(0),y(0) { }
// other ctors / functions...
};
Will initialize both x and y to 0. Note that you can use x(), y() to initialize them disregarding of their type: That's then value initialization, and usually yields a proper...