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How can building a heap be O(n) time complexity?
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I think there are several questions buried in this topic:
How do you implement buildHeap so it runs in O(n) time?
How do you show that buildHeap runs in O(n) time when implemented correctly?
Why doesn't that same logic work to make heap sort run in O(n) time rather than O(n ...
Prevent body scrolling but allow overlay scrolling
...ange in the future), when you open the overlay a noscroll class is applied to the body element and overflow: hidden is set, thus body is no longer scrollable.
The overlay (created on-the-fly or already inside the page and made visible via display: block, it makes no difference) has position : fixed...
Downloading a file from spring controllers
I have a requirement where I need to download a PDF from the website. The PDF needs to be generated within the code, which I thought would be a combination of freemarker and a PDF generation framework like iText. Any better way?
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Are Stored Procedures more efficient, in general, than inline statements on modern RDBMS's? [duplica
Conventional wisdom states that stored procedures are always faster. So, since they're always faster, use them ALL THE TIME .
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Merge pull request to a different branch than default, in Github
A pull request comes into my repo hosted on Github. By default it is merged into the master branch.
6 Answers
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How do I Sort a Multidimensional Array in PHP [duplicate]
I have CSV data loaded into a multidimensional array. In this way each "row" is a record and each "column" contains the same type of data. I am using the function below to load my CSV file.
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Is SHA-1 secure for password storage?
... SHA-1 is as safe as anything against preimage attacks, however it is easy to compute, which means it is easier to mount a bruteforce or dictionary attack. (The same is true for successors like SHA-256.) Depending on the circumstances, a hash function which was designed to be computationally expensi...
Scanner vs. BufferedReader
...o know that the BufferedReader reads files efficiently by using a buffer to avoid physical disk operations.
12 Answers
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Adding n hours to a date in Java?
How do I add n hours to a Date object? I found another example using days on StackOverflow, but still don't understand how to do it with hours.
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Elegant solution to duplicate, const and non-const, getters? [duplicate]
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I recall from one of the Effective C++ books that the way to do it is to implement the non-const version by casting away the const from the other function.
It's not particularly pretty, but it is safe. Since the member function calling it is non-const, the object itself is non-cons...