大约有 40,000 项符合查询结果（耗时：0.0745秒） [XML]
Weighted random numbers
...
1) calculate the sum of all the weights
2) pick a random number that is 0 or greater and is less than the sum of the weights
3) go through the items one at a time, subtracting their weight from your random number, until you get the item where the random number is less than that item's weight
Ps...
Twitter Bootstrap Form File Element Upload Button
...w: hidden;
}
.btn-file input[type=file] {
position: absolute;
top: 0;
right: 0;
min-width: 100%;
min-height: 100%;
font-size: 100px;
text-align: right;
filter: alpha(opacity=0);
opacity: 0;
outline: none;
background: white;
cursor: inherit;
display...
How can I link to a specific glibc version?
When I compile something on my Ubuntu Lucid 10.04 PC it gets linked against glibc. Lucid uses 2.11 of glibc. When I run this binary on another PC with an older glibc, the command fails saying there's no glibc 2.11...
...
SQL standard to escape column names?
...il Bourque
186k5757 gold badges571571 silver badges804804 bronze badges
answered May 25 '10 at 1:49
Dean HardingDean Harding
65.8k...
How is set() implemented?
... AJP
19.9k1616 gold badges7272 silver badges102102 bronze badges
answered Oct 16 '10 at 14:47
Justin EthierJustin Ethier
11...
How to change ViewPager's page?
...
answered Sep 16 '11 at 14:40
Mark AllisonMark Allison
21.2k88 gold badges4242 silver badges4545 bronze badges
...
Error-Handling in Swift-Language
... in exception path than in success path. This is not the case with Swift 2.0 errors, where success path and error path cost roughly the same.
All error throwing code must be declared, while exceptions might have been thrown from anywhere. All errors are "checked exceptions" in Java nomenclature. How...
Length of generator output [duplicate]
...f you have a lazy infinite generator? For example:
def fib():
a, b = 0, 1
while True:
a, b = b, a + b
yield a
This never terminates but will generate the Fibonacci numbers. You can get as many Fibonacci numbers as you want by calling next().
If you really need to know t...
IN vs OR in the SQL WHERE Clause
... your specific data to see which is faster.
I tried both on a MySQL with 1000000 rows. When the column is indexed there is no discernable difference in performance - both are nearly instant. When the column is not indexed I got these results:
SELECT COUNT(*) FROM t_inner WHERE val IN (1000, 2000, ...
How do I show an open file in eclipse Package Explorer?
...
answered Jun 13 '11 at 18:08
Konstantin KomissarchikKonstantin Komissarchik
27.8k44 gold badges5656 silver badges6161 bronze badges
...