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How to detect a loop in a linked list?
...st does not exist..so no loop either
return false;
Node slow, fast; // create two references.
slow = fast = first; // make both refer to the start of the list
while(true) {
slow = slow.next; // 1 hop
if(fast.next != null)
fast = fast.next...
Merge, update, and pull Git branches without using checkouts
...
The Short Answer
As long as you're doing a fast-forward merge, then you can simply use
git fetch <remote> <sourceBranch>:<destinationBranch>
Examples:
# Merge local branch foo into local branch master,
# without having to checkout master first.
# He...
What is the most efficient string concatenation method in python?
...s more-or-less the same)
On the strength of that, the array module may be fastest if you can shoehorn your problem into it. But ''.join is probably fast enough and has the benefit of being idiomatic and thus easier for other python programmers to understand.
Finally, the golden rule of optimizati...
What are fail-safe & fail-fast Iterators in Java
There are two types of iterators in Java: fail-safe and fail-fast.
4 Answers
4
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How to fast-forward a branch to head?
...inished pulling and then I switch to a different branch, which needs to be fast-forwarded. It's annoying to me if I have to do another (no-op) pull and wait for it to complete; doing a local-only operation is faster and is what I want anyway.
– Baron Schwartz
M...
What is uint_fast32_t and why should it be used instead of the regular int and uint32_t?
.... Some have a 9-bit bytes for example, so they don't have a uint32_t.
uint_fast32_t states your intent clearly: it's a type of at least 32 bits which is the best from a performance point-of-view. uint_fast32_t may be in fact 64 bits long. It's up to the implementation.
... there is uint_fast32_...
Converting Mercurial folder to a Git repository
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On Linux or anything with bash/sh or similar, or python, try with fast export:
cd
git clone git://repo.or.cz/fast-export.git
git init git_repo
cd git_repo
~/fast-export/hg-fast-export.sh -r /path/to/old/mercurial_repo
git checkout HEAD
...
Git fast forward VS no fast forward merge
Git merge allow us to perform fast forward and no fast fast forward branch merging. Any ideas when to use fast forward merge and when to use no fast forward merge?
...
Why does git perform fast-forward merges by default?
...
Fast-forward merging makes sense for short-lived branches, but in a more complex history, non-fast-forward merging may make the history easier to understand, and make it easier to revert a group of commits.
Warning: Non-fast...
When to use enumerateObjectsUsingBlock vs. for
...may or may not prove interesting:
enumerateObjectsUsingBlock: will be as fast or faster than fast enumeration (for(... in ...) uses the NSFastEnumeration support to implement enumeration). Fast enumeration requires translation from an internal representation to the representation for fast enumera...