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What is the best way to use a HashMap in C++?
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The standard library includes the ordered and the unordered map (std::map and std::unordered_map) containers. In an ordered map the elements are sorted by the key, insert and access is in O(log n). Usually the standard library internally uses red black trees ...
Favicon not showing up in Google Chrome [duplicate]
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for me i was calling other .php files with full html sytax... like head body etc... into my file... removing the sytax from the source files fixed it for me
– DragonFire
Mar 22 '17 at 0:14
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List vs tuple, when to use each? [duplicate]
... You would want to change the values (go with list), but at the same time order and position is meaningful and consistent (go with tuple?).
– Arlen
Aug 23 '11 at 15:13
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What is difference between functional and imperative programming languages?
...he computer how to change bits, bytes and words in it's memory and in what order. In functional ones, we tell the computer what things, actions etc. are. For example, we say that the factorial of 0 is 1, and the factorial of every other natural number is the product of that number and the factorial ...
Retrieving a List from a java.util.stream.Stream in Java 8
...s forEach is explicitly nondeterministic—even in a sequential stream the order of element processing is not guaranteed. You would have to use forEachOrdered to ensure correct ordering. The intention of the Stream API designers is that you will use collector in this situation, as below.]
An altern...
brew install mysql on macOS
...d MySQL 5.7, the process is a bit different than for previous versions.
In order to reset the root password, proceed as follows:
sudo rm -rf /usr/local/var/mysql
mysqld --initialize
A temporary password will be printed to the console and it can only be used for updating the root password:
mysql....
Converting an array of objects to ActiveRecord::Relation
...ECT .... WHERE `my_models`.id IN (2, 3, 4, 6, ....
Keep in mind that the ordering of the array will be lost - But since your objective is only to run a class method on the collection of these objects, I assume it won't be a problem.
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When and why are database joins expensive?
... bulk disk reads which are the most expensive aspect of the exercise by an order of magnitude. Performing a join, by contrast, logically requires retrieval of only the keys. In practice, not even the key values are fetched: the key hash values are used for join comparisons, mitigating the cost of mu...
How to evaluate a math expression given in string form?
...described wiki.The logic of this algoritm starting from rules of operation orders. 1. operator sign | variable evaluation | function call | parenthesis (sub-expressions); 2. exponentiation; 3. multiplication, division; 4. addition, subtraction;
– Vasile Bors
J...
Only parameterless constructors and initializers are supported in LINQ to Entities
...u're building, there is another way to solve this issue.
var query = from orderDetail in context.OrderDetails
join order in context.Orders on order.OrderId equals orderDetail.orderId
select new { order, orderDetail };
At this point you have an IQueryable containing an anon...