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How to print binary tree diagram?
How can I print a binary tree in Java so that the output is like:
28 Answers
28
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Why is MATLAB so fast in matrix multiplication?
I am making some benchmarks with CUDA, C++, C#, Java, and using MATLAB for verification and matrix generation. When I perform matrix multiplication with MATLAB, 2048x2048 and even bigger matrices are almost instantly multiplied.
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upstream sent too big header while reading response header from upstream
I am getting these kind of errors:
8 Answers
8
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What's the nearest substitute for a function pointer in Java?
...interface StringFunction {
int func(String param);
}
A method that takes the pointer would just accept StringFunction instance like so:
public void takingMethod(StringFunction sf) {
int i = sf.func("my string");
// do whatever ...
}
And would be called like so:
ref.takingMethod(new S...
Java time-based map/cache with expiring keys [closed]
Do any of you know of a Java Map or similar standard data store that automatically purges entries after a given timeout? This means aging, where the old expired entries “age-out” automatically.
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What are the differences between segment trees, interval trees, binary indexed trees and range trees
...mption for one dimension:
Segment tree - O(n logn) preprocessing time, O(k+logn) query time, O(n logn) space
Interval tree - O(n logn) preprocessing time, O(k+logn) query time, O(n) space
Range tree - O(n logn) preprocessing time, O(k+logn) query time, O(n) space
Binary Indexed tree - O(n logn) pr...
How to generate all permutations of a list?
...'re using an older Python (<2.6) for some reason or are just curious to know how it works, here's one nice approach, taken from http://code.activestate.com/recipes/252178/:
def all_perms(elements):
if len(elements) <=1:
yield elements
else:
for perm in all_perms(eleme...
Why does this iterative list-growing code give IndexError: list assignment index out of range?
...t do:
j = list(i)
Alternatively, if you wanted to use the Python list like an array in other languages, then you could pre-create a list with its elements set to a null value (None in the example below), and later, overwrite the values in specific positions:
i = [1, 2, 3, 5, 8, 13]
j = [None] * ...
Change the name of a key in dictionary
I want to change the key of an entry in a Python dictionary.
15 Answers
15
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Getting a slice of keys from a map
Is there any simpler/nicer way of getting a slice of keys from a map in Go?
6 Answers
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