大约有 5,000 项符合查询结果（耗时：0.0215秒） [XML]
Getting a slice of keys from a map
...hen generating the array of keys ten times with each method), it was about 20% faster to assign members of the array directly than to use append.
Although setting the capacity eliminates reallocations, append still has to do extra work to check if you've reached capacity on each append.
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How can I check if multiplying two numbers in Java will cause an overflow?
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I checked it. For small values it is 20% faster than BigInteger and for values near MAX it is nearly the same (5% faster). Yossarian's code is the fastest (95% & 75% faster than BigInteger).
– Thomas Jung
Nov 1 '09 at 1...
How can I resize an image dynamically with CSS as the browser width/height changes?
...lt="cat">
This restricts the height of the image to a maximum of 20% of the viewport.
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Detect when an image fails to load in Javascript
...pixels.
TIP 2 : for use with portrait of people, use object-position: 20% 50%;
CSS only for background-img
For missing background images, I also added the following on each background-image declaration :
background-image: url('path-to-image.png'), url('no-img.png');
NOTE : not working ...
Tools for JPEG optimization? [closed]
...in progressive mode. Another image (27 kB) was reduced to 23 kB. That's 15-20% savings without loss in quality!
– chris166
Jun 12 '09 at 13:51
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Test for equality among all elements of a single vector
...e zero_range is faster. The discrepancy is between slightly faster (maybe 20%) to 10x always in favour if this answer. It tried a number of methods.
– John
Jan 22 '11 at 8:38
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Converting RGB to grayscale/intensity
... Y -> L*
In color science, the common RGB values, as in html rgb( 10%, 20%, 30% ),
are called "nonlinear" or
Gamma corrected.
"Linear" values are defined as
Rlin = R^gamma, Glin = G^gamma, Blin = B^gamma
where gamma is 2.2 for many PCs.
The usual R G B are sometimes written as R' G' B' (R' ...
WPF: Setting the Width (and Height) as a Percentage Value
...e textbox appears to be 80% size of it's parent (well right side margin is 20%) and stretches when needed.
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Rank items in an array using Python/NumPy, without sorting array twice
...ys, but for anything smaller (n < 100), double argsort is faster (about 20% faster for n=100, and about 5 times faster for n=10). So if you have to do a lot of rankings across lots of small sets of values, this method is much better.
– naught101
Aug 18 '15 a...
Differences between INDEX, PRIMARY, UNIQUE, FULLTEXT in MySQL?
...e amount of records in the result set on which an index is applied exceeds 20% of the total amount of records of the parent table, then the index will be ineffective. In practice each architecture will differ but, the idea is still correct.
Secondary Indexes (and that is very specific to mysql) sho...