大约有 40,000 项符合查询结果（耗时：0.0241秒） [XML]
Measuring execution time of a function in C++
I want to find out how much time a certain function takes in my C++ program to execute on Linux . Afterwards, I want to make a speed comparison . I saw several time function but ended up with this from boost. Chrono:
...
How to overcome TypeError: unhashable type: 'list'
...
Internally, hash() method calls __hash__() method of an object which are set by default for any object.
Converting a nested list to a set
>>> a = [1,2,3,4,[5,6,7],8,9]
>>> set(a)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unh...
Assignment inside lambda expression in Python
...(
__init__ = lambda self, radius, height: sub(
setattr(self, 'radius', radius),
setattr(self, 'height', height)),
volume = property(lambda self: fun(
['def' for top_area in [math.pi * self.radius ** 2]],
self.h...
What is the difference between map and flatMap and a good use case for each?
Can someone explain to me the difference between map and flatMap and what is a good use case for each?
16 Answers
...
Multi-line string with extra space (preserved indentation)
...
Fun thing is, I found you answer when trying to set value for USAGE variable too. So your answer matches exactly. :)
– Bunyk
Mar 22 '18 at 13:52
1
...
Output array to CSV in Ruby
...ically extracting certain columns from the original census table into a subset.
– tamouse
Nov 13 '13 at 16:46
3
...
How to add leading zeros for for-loop in shell? [duplicate]
... so you can either install macports and use its version of seq, or you can set the format explicitly:
seq -f '%02g' 1 3
01
02
03
But given the ugliness of format specifications for such a simple problem, I prefer the solution Henk and Adrian gave, which just uses Bash. Apple can't scr...
How do I typedef a function pointer with the C++11 using syntax?
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
...
Is it safe to use -1 to set all bits to true?
...its one (it has, of course)." -- whaat??? I thought the whole point was to set all bits to 1. That's how flags work..no?? You look at the bits. Who cares about the value?
– mpen
Aug 1 '10 at 21:11
...
Knight's Shortest Path on Chessboard
...ce] := 0 // Distance from source to source
Q := the set of all nodes in Graph
// All nodes in the graph are unoptimized - thus are in Q
while Q is not empty: // The main loop
u := vertex in Q with smallest dist[]
if dist[u] = infinity:
...