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Maximum number of characters using keystrokes A, Ctrl+A, Ctrl+C and Ctrl+V
...he complexity might appear to be O(N), but since the numbers grow at an exponential rate it is actually O(N2) due to the complexity of multiplying the large numbers. Below is a Python implementation. It takes about 0.5 seconds to calculate for N=50,000.
def max_chars(n):
dp = [0] * (n+1)
for i ...
How to correctly close a feature branch in Mercurial?
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One way is to just leave merged feature branches open (and inactive):
$ hg up default
$ hg merge feature-x
$ hg ci -m merge
$ hg heads
(1 head)
$ hg branches
default 43:...
feature-x 41:...
(2 branches)
$ hg b...
Why does GCC generate such radically different assembly for nearly the same C code?
...ey are so different, first we must understand how GCC optimizes fast_trunc_one().
Believe it or not, fast_trunc_one() is being optimized to this:
int fast_trunc_one(int i) {
int mantissa, exponent;
mantissa = (i & 0x07fffff) | 0x800000;
exponent = 150 - ((i >> 23) & 0xff);...
How to initialize an array in one step using Ruby?
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Plus one for the detailed answer, even though I prefer splat over to_a ([*'1'..'3']).
– Michael Kohl
Feb 5 '11 at 17:48
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Create numpy matrix filled with NaNs
...tion in-place, so numpy.empty((3,3,)).fill(numpy.nan) will instead return None.
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Accessing inactive union member and undefined behavior?
...s under the impression that accessing a union member other than the last one set is UB, but I can't seem to find a solid reference (other than answers claiming it's UB but without any support from the standard).
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Python: Find in list
...first question: that code is perfectly fine and should work if item equals one of the elements inside myList. Maybe you try to find a string that does not exactly match one of the items or maybe you are using a float value which suffers from inaccuracy.
As for your second question: There's actually...
Running multiple commands in one line in shell
...or is && operator to execute the next command only if the previous one succeeded:
cp /templates/apple /templates/used && cp /templates/apple /templates/inuse && rm /templates/apple
Or
cp /templates/apple /templates/used && mv /templates/apple /templates/inuse
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How does the HyperLogLog algorithm work?
...ve been learning about different algorithms in my spare time recently, and one that I came across which appears to be very interesting is called the HyperLogLog algorithm - which estimates how many unique items are in a list.
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How to make rounded percentages add up to 100%
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Since none of the answers here seem to solve it properly, here's my semi-obfuscated version using underscorejs:
function foo(l, target) {
var off = target - _.reduce(l, function(acc, x) { return acc + Math.round(x) }, 0);
r...