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How can I multiply and divide using only bit shifting and adding?
... = 10101_2 * 5
= 21 * 5 (Same as initial expression)
(_2 means base 2)
As you can see, multiplication can be decomposed into adding and shifting and back again. This is also why multiplication takes longer than bit shifts or adding - it's O(n^2) rather than O(n) i...
Efficient way to determine number of digits in an integer
...ion optimization for 32-bit numbers
template<>
int numDigits(int32_t x)
{
if (x == MIN_INT) return 10 + 1;
if (x < 0) return numDigits(-x) + 1;
if (x >= 10000) {
if (x >= 10000000) {
if (x >= 100000000) {
if (x >= 1000000000)
...
How does this milw0rm heap spraying exploit work?
...code but for this one I can’t figure out the logic. The code is from an exploit that has been published 4 days ago. You can find it at milw0rm .
...
How to get different colored lines for different plots in a single figure?
...is by default.
E.g.:
import matplotlib.pyplot as plt
import numpy as np
x = np.arange(10)
plt.plot(x, x)
plt.plot(x, 2 * x)
plt.plot(x, 3 * x)
plt.plot(x, 4 * x)
plt.show()
And, as you may already know, you can easily add a legend:
import matplotlib.pyplot as plt
import numpy as np
x = np....
Where does Oracle SQL Developer store connections?
... have an application that I can't get connected to my Oracle Database 11g Express Edition. I created a test database in this edition, and I can connect to the database fine using Oracle SQL Developer, create tables, views etc. However, I'm having a hard time getting connected via my application. Whe...
How do I concatenate two arrays in C#?
...
var z = new int[x.Length + y.Length];
x.CopyTo(z, 0);
y.CopyTo(z, x.Length);
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Concatenate two slices in Go
...
@Toad: It doesn't actually spread them out. In the foo() example above, the is parameter holds a copy of the original slice, which is to say it has a copy of the light-weight reference to the same underlying array, len and cap. If the foo function alters a member, the change will be...
Bomb dropping algorithm
I have an n x m matrix consisting of non-negative integers. For example:
32 Answers
...
range() for floats
...ction, but writing one like this shouldn't be too complicated.
def frange(x, y, jump):
while x < y:
yield x
x += jump
As the comments mention, this could produce unpredictable results like:
>>> list(frange(0, 100, 0.1))[-1]
99.9999999999986
To get the expected result, y...
What is the difference between Θ(n) and O(n)?
...
Short explanation:
If an algorithm is of Θ(g(n)), it means that the running time of the algorithm as n (input size) gets larger is proportional to g(n).
If an algorithm is of O(g(n)), it means that the running time of the ...