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二分算法（Binary Search） · App Inventor 2 中文网
...这也是最笨的一种方式，当然最终能够猜对，当随机数是100时，最多需要猜100次。
再设计一个二分算法，每次猜中间折半的结果，比如第一次猜50，如果小了则再猜75，如此直到不能再折半为止，也定能猜中。至于需要几次猜...
MongoDB and “joins” [duplicate]
...
100
It's no join since the relationship will only be evaluated when needed. A join (in a SQL datab...
Get difference between two lists
...f x not in s]
Performance test
import timeit
init = 'temp1 = list(range(100)); temp2 = [i * 2 for i in range(50)]'
print timeit.timeit('list(set(temp1) - set(temp2))', init, number = 100000)
print timeit.timeit('s = set(temp2);[x for x in temp1 if x not in s]', init, number = 100000)
print timeit...
Understanding the Gemfile.lock file
...ck agnostic to the installer's Ruby version).
BUNDLED WITH (Bundler >= v1.10.x)
The version of Bundler used to create the Gemfile.lock. Used to remind installers to update their version of Bundler, if it is older than the version that created the file.
PLUGIN SOURCE (optional and very rare)
I...
Get battery level and state in Android
... batteryPct = level / (double) scale;
return (int) (batteryPct * 100);
}
}
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Convert JsonNode into POJO
...
@EricBarr, I am using Jackson v1.9.11 and the syntax in your answer is the correct one for that version. Perhaps they tried to change things and reverted them again in the newer versions
– Ivaylo Slavov
Oct 23 '14 at...
How do I count the number of occurrences of a char in a String?
...haracter string, I get a difference of 6049 ns vs 26,739 ns (averaged over 100runs). Raw numbers are huge difference, but percetage wise...it adds up. Avoid the memory allocations - use a loop!
– Ben
Nov 18 '14 at 15:41
...
Detect when browser receives file download
... 0) ) {
unblockSubmit();
}
attempts--;
}, 1000 );
}
function unblockSubmit() {
setCursor( "auto", "pointer" );
window.clearInterval( downloadTimer );
expireCookie( "downloadToken" );
attempts = 30;
}
Example server code (PHP):
$TOKEN = "downloadToken";
/...
How do I conditionally apply CSS styles in AngularJS?
...
The latest docs (v1.2) describe ng-attr- on the directives page, section ngAttr attribute bindings.
– Mark Rajcok
Aug 21 '13 at 12:50
...
How to sort with a lambda?
...,
[](Foo& f)
{
f._i = rand() % 100;
});
std::cout << "before sort: " << toString(v) << "\n";
sort(v.begin(), v.end(),
[](const Foo& a, const Foo& b)
{
return a._i > ...