大约有 43,000 项符合查询结果（耗时：0.0409秒） [XML]
Mod of negative number is melting my brain
...
@RuudLenders: No. If x = -5 and m = 2, then r = x%m is -1, after which r+m is 1. The while loop is not needed. The point is that (as I wrote in the answer), x%m is always strictly greater than -m, so you need to add m at most once to make it positive.
...
How to sum up elements of a C++ vector?
...tor.begin(); it != vector.end(); ++it)
sum_of_elems += *it;
Using a standard algorithm:
#include <numeric>
sum_of_elems = std::accumulate(vector.begin(), vector.end(), 0);
Important Note: The last argument's type is used not just for the initial value, but for the type of the resu...
Using custom std::set comparator
... of the items in a set of integers to be lexicographic instead of numeric, and I can't get the following to compile with g++:
...
Call Go functions from C
...hould make things a little clearer.
package foo
// extern int goCallbackHandler(int, int);
//
// static int doAdd(int a, int b) {
// return goCallbackHandler(a, b);
// }
import "C"
//export goCallbackHandler
func goCallbackHandler(a, b C.int) C.int {
return a + b
}
// This is the public ...
defaultdict of defaultdict?
...ultdict(int)) will be called when you try to access a key that don't exist and the return value of it will be set as the new value of this key which mean in our case the value of d[Key_dont_exist] will be defaultdict(int), and if you try to access a key from this last defaultdict i.e. d[Key_dont_exi...
Unexpected character encountered while parsing value
...mpfile,... that type of tmpfile is string that contain path to a file. JsonConvert.DeserializeObject takes JSON value, not file path - so it fails trying to convert something like @"c:\temp\fooo" - which is clearly not JSON.
...
LINQ Aggregate algorithm explained
...
The easiest-to-understand definition of Aggregate is that it performs an operation on each element of the list taking into account the operations that have gone before. That is to say it performs the action on the first and second element and carr...
How to hide one item in an Android Spinner
I am looking for a way to hide one item in an Android spinner widget. This would allow you to simulate a spinner with no items selected, and ensures that the onItemSelected() callback is always called for every item selected (if the hidden item is the "current" one). Normally there is always one ite...
How to use `string.startsWith()` method ignoring the case?
...
One option is to convert both of them to either lowercase or uppercase:
"Session".toLowerCase().startsWith("sEsSi".toLowerCase());
This is wrong. See: https://stackoverflow.com/a/15518878/14731
Another option is to use String#regionMat...
Nullable vs. int? - Is there any difference?
Apparently Nullable<int> and int? are equivalent in value. Are there any reasons to choose one over the other?
5 ...