大约有 44,000 项符合查询结果（耗时：0.0242秒） [XML]
static linking only some libraries
...cpp
# c++ test.cpp /usr/lib/libX11.a
# ldd a.out
linux-vdso.so.1 => (0x00007fff385cc000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f9a5b233000)
libm.so.6 => /lib/libm.so.6 (0x00007f9a5afb0000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007f9a5ad99000)
libc.so.6 => /lib/libc.so....
Getting unique items from a list [duplicate]
...such as a Dictionary or HashSet. Because currently, if source contains 100,000 items with many duplicates, then in every one of the 100,000 iterations you will be scanning a list on the order of 100,000 items, meaning you are scanning on the order of 100,000 * 100,000 items. Quadratic time complexit...
How to wait in a batch script? [duplicate]
...ly doesn't exist and specify the desired timeout:
ping 192.0.2.2 -n 1 -w 10000 > nul
And since the address does not exists, it'll wait 10,000 ms (10 seconds) and returns.
The -w 10000 part specifies the desired timeout in milliseconds.
The -n 1 part tells ping that it should only tries once ...
ERROR 2003 (HY000): Can't connect to MySQL server on '127.0.0.1' (111)
I use the following command:
15 Answers
15
...
How to evaluate http response codes from bash/shell script?
...esponse is a good answer, it overlooks failure scenarios. curl will return 000 if there is an error in the request or there is a connection failure.
url='http://localhost:8080/'
status=$(curl --head --location --connect-timeout 5 --write-out %{http_code} --silent --output /dev/null ${url})
[[ $stat...
LINQ .Any VS .Exists - What's the difference?
...o evaluate both values at almost same time)
var list1 = Generate(1000000);
var forceListEval = list1.SingleOrDefault(o => o == "0123456789012");
if (forceListEval != "sdsdf")
{
var s = string.Empty;
var start2 = DateTime.Now;
if...
ERROR 2006 (HY000): MySQL server has gone away
...
I solved the error ERROR 2006 (HY000) at line 97: MySQL server has gone away and successfully migrated a >5GB sql file by performing these two steps in order:
Created /etc/my.cnf as others have recommended, with the following contents:
[mysql]
connect_...
Timer function to provide time in nano seconds using C++
...unsigned long long rep;
typedef std::ratio<1, 2'800'000'000> period; // My machine is 2.8 GHz
typedef std::chrono::duration<rep, period> duration;
typedef std::chrono::time_point<clock> time_point;
static const bool is_steady = ...
Select multiple records based on list of Id's with linq
...id, (up, id) => up);
And now result of my measurement. I generated 100 000 UserProfiles and 100 000 ids. Join took 32ms and .Where with .Contains took 2 minutes and 19 seconds! I used pure IEnumerable for this testing to prove my statement. If you use List instead of IEnumerable, .Where and .Con...
How does tuple comparison work in Python?
...: x = tuple([0 for _ in range(n)]) and do the same for y. Setting n=100, 1000, 10,000, and 100,000 and running %timeit x==y gave timing values of .5, 4.6, 43.9, and 443 microseconds respectively, which is about as close to O(n) as you can practically get.
– Michael Scott Cuth...