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Erasing elements from a vector
...ex access,
To avoid O(n^2) complexity
you can use two indices, i - current testing index, j - index to
store next item and at the end of the cycle new size of the vector.
code:
void erase(std::vector<int>& v, int num)
{
size_t j = 0;
for (size_t i = 0; i < v.size(); ++i) {
if...
Explain Morris inorder tree traversal without using stacks or recursion
... break
pre = pre.right
#And now for some tests. Try "pip3 install binarytree" to get the needed package which will visually display random binary trees
import binarytree as b
for _ in range(10):
print()
print("Example #",_)
tree=b.tree()
print(tree)
...
Deserialize JSON to ArrayList using Jackson
...
This works for me.
@Test
public void cloneTest() {
List<Part> parts = new ArrayList<Part>();
Part part1 = new Part(1);
parts.add(part1);
Part part2 = new Part(2);
parts.add(part2);
try {
ObjectMapper o...
Facebook database design?
... requires some trial and error and benchmarking.
Here is my disappointing test for just findings friends of friends:
DB Schema:
CREATE TABLE IF NOT EXISTS `friends` (
`id` int(11) NOT NULL,
`user_id` int(11) NOT NULL,
`friend_id` int(11) NOT NULL
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARS...
Adding parameter to ng-click function inside ng-repeat doesn't seem to work
... <div >
<img ng-src={{'./assets/img/PlaceHolder/Test.png'}}
<!--Pass Param-->
ng-click="connectDevice(scannedDevice.id)"
altSrc="{{'./assets/img/PlaceHolder/user_place_holder.png'}}"
onerro...
How to make inline functions in C#
... creating an anonymous function.
Here's some really simple code I used to test this (VS2015):
static void Main(string[] args)
{
Func<int, int> incr = a => a + 1;
Console.WriteLine($"P1 = {incr(5)}");
}
What does the compiler generate? I used a nifty tool cal...
How to send a JSON object using html form data
...
You can try something like:
<html>
<head>
<title>test</title>
</head>
<body>
<form id="formElem">
<input type="text" name="firstname" value="Karam">
<input type="text" name="lastname" value="Yousef">
<input...
What is a memory fence?
... locking primitives from your compiler or standard library; these are well tested, should have all the necessary memory barriers in place, and are probably quite optimized (optimizing locking primitives is tricky; even the experts can get them wrong sometimes).
...
Grouped LIMIT in PostgreSQL: show the first N rows for each group?
...der by t_outer.section_id;
It might be faster but, of course, you should test performance specifically on your data and use case.
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How update the _id of one MongoDB Document?
...over the collection for ever. Snapshot doesn't do what you expect (you can test it by taking a 'snapshot' adding a document to the collection, then seeing that that new document is in the snapshot)
– Patrick
Jan 16 '15 at 10:01
...