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Copying a HashMap in Java
...d structures, HashMap.putAll() will copy by reference, because it doesn't know how to exactly copy your object. For example:
import java.util.*;
class Playground {
public static void main(String[ ] args) {
Map<Integer, Map<Integer,List<Float>>> dataA = new HashMap<&...
Mapping over values in a python dictionary
... that's because rather than look up all key-value pairs in one go, you are now using number-of-keys times my_dictionary.__getitem__ calls.
– Martijn Pieters♦
Oct 15 '14 at 15:21
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Android AlertDialog Single Button
... }
});
AlertDialog alert = builder.create();
alert.show();
Now it is up to you to use one,two or three buttons..
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Advantages of Binary Search Trees over Hash Tables
...array. Of course, the ultimate number of elements being added may not be known, so the hash table may still allocate more space than is necessary. Binary search trees can waste just as much memory or more, though. Linked implementations need space for at least two additional pointers per element ...
sys.argv[1] meaning in script
...like to note that previous answers made many assumptions about the user's knowledge. This answer attempts to answer the question at a more tutorial level.
For every invocation of Python, sys.argv is automatically a list of strings representing the arguments (as separated by spaces) on the command-l...
Will using 'var' affect performance?
...ate 8 Years Later
I need to update this as my understanding has changed. I now believe it may be possible for var to affect performance in the situation where a method returns an interface, but you would have used an exact type. For example, if you have this method:
IList<int> Foo()
{
retu...
pandas three-way joining multiple dataframes on columns
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This is decent advice and has now been incorporated into pandas merging 101 (see the section on merging multiple dataframes). It's worth noting that if your join keys are unique, using pd.concat will result in simpler syntax: pd.concat([df.set_index('name...
@Resource vs @Autowired
...inject.Inject - use it, with a combination of @Qualifier. Note that spring now also supports the @javax.inject.Qualifier meta-annotation:
@Qualifier
@Retention(RUNTIME)
public @interface YourQualifier {}
So you can have
<bean class="com.pkg.SomeBean">
<qualifier type="YourQualifier"/...
Notepad++ Setting for Disabling Auto-open Previous Files
...sion's information / opened files and starts over.
Alternatively, if you know the file which is causing notepad++ to hang, you can simply rename the file and open notepad++. This will solve the problem.
I hadn't seen this solution listed when I was googling my problem so I wanted to add it here!
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Choosing between std::map and std::unordered_map [duplicate]
Now that std has a real hash map in unordered_map , why (or when) would I still want to use the good old map over unordered_map on systems where it actually exists? Are there any obvious situations that I cannot immediately see?
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