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Heap vs Binary Search Tree (BST)
... can be efficiently implemented on top of either dynamic arrays or pointer-based trees, BST only pointer-based trees. So for the heap we can choose the more space efficient array implementation, if we can afford occasional resize latencies.
binary heap creation is O(n) worst case, O(n log(n)) for BS...
What would cause an algorithm to have O(log n) complexity?
...f this.
Processing values one digit at a time
How many digits are in the base-10 number n? Well, if there are k digits in the number, then we'd have that the biggest digit is some multiple of 10k. The largest k-digit number is 999...9, k times, and this is equal to 10k + 1 - 1. Consequently, if...
What does functools.wraps do?
...ors, I don't believe that @wrap will do the job. I have instead created a base decorator class like so:
class DecBase(object):
func = None
def __init__(self, func):
self.__func = func
def __getattribute__(self, name):
if name == "func":
return super(DecBas...
Convert a character digit to the corresponding integer in C
...strtol() works like this:
long strtol(const char *str, char **endptr, int base);
It converts *str to a long, treating it as if it were a base base number. If **endptr isn't null, it holds the first non-digit character strtol() found (but who cares about that).
...
Enums and Constants. Which to use when?
...
What's missing from the other answers is that enums have an integer base type. You can change the default from int to any other integral type except char like:
enum LongEnum : long {
foo,
bar,
}
You can cast explicitly from and implicitly to the the base type, which is useful in sw...
What are the benefits of dependency injection containers?
.... This allows the programmer to pick and choose how objects are connected based exclusively on their required interfaces on one end and their expressed interfaces on the other.
External (Xml) configuration of DI objects means that others can customize your code in unforeseen directions.
External co...
What are the differences between “=” and “
...ch code is atrocious (and you may be right). But I took this code from the base::file.copy function (replacing <- with =) — it’s a pervasive pattern in much of the core R codebase.
The original explanation by John Chambers, which the the R documentation is probably based on, actually explai...
Current time formatting with Javascript
...rts:
getFullYear() - Returns the 4-digit year
getMonth() - Returns a zero-based integer (0-11) representing the month of the year.
getDate() - Returns the day of the month (1-31).
getDay() - Returns the day of the week (0-6). 0 is Sunday, 6 is Saturday.
getHours() - Returns the hour of the day (0-...
Objective-C for Windows
...ers -L /GNUstep/GNUstep/System/Library/Libraries -std=c99 -lobjc -lgnustep-base -fconstant-string-class=NSConstantString
Finally, from the command prompt, type helloworld to run it
All the best, and have fun with Objective-C!
NOTES:
I used the default install path - adjust your command line ...
OpenSSH升级后不能登录的问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...v packagekit-media.repo packagekit-media.repo.bak
配置源
vi CentOS-Base.repo
[base]
name=CentOS-$releasever - Base - mirrors.aliyun.com
failovermethod=priority
baseurl=http://mirrors.aliyun.com/centos/6.7/os/$basearch/
http://mirrors.aliyuncs.com/centos/6.7/os/$basearch/
#mirro...