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Comparing two files in linux terminal
...d-group-format="%<" --unchanged-group-format="" file1.txt file2.txt
[root@vmoracle11 tmp]# cat file1.txt
test one
test two
test three
test four
test eight
[root@vmoracle11 tmp]# cat file2.txt
test one
test three
test nine
[root@vmoracle11 tmp]# diff --changed-group-format='%<' --unchanged...
深入浅出计算机字符集编码 - C/C++ - 清泛网 - 专注C/C++及内核技术
...字、标点、图形符号、数字等。这个集合叫做字符集；
如何进行存储。规定字符集中的每个字符分别用一个字节还是多个字节存储，用哪些字节来存储，这个规定叫做编码。
charset ，字符集，也就是某个符号和某个数字映...
Regex Named Groups in Java
...etimes a double return system is used where the tail is
* returned in root.
*/
private Node group0() {
boolean capturingGroup = false;
Node head = null;
Node tail = null;
int save = flags;
root = null;
int ch = next();
if (ch == '...
MFC OnEraseBkgnd浅析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...完成之前，windows已把视频卡的缓存输出到屏幕上了。
如何擦除之前的背景图片？
我明白问题所在了，你的问题是当窗口大小变化时，原来的背景没有被清除，造成图片重叠显示，你上面的代码没有问题，写在OnEraseBkgnd()中还...
How do I get monitor resolution in Python?
...o this post: How to get the screen size in Tkinter?
import tkinter as tk
root = tk.Tk()
screen_width = root.winfo_screenwidth()
screen_height = root.winfo_screenheight()
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How can I add remote repositories in Mercurial?
...the remotes without a text editor:
add-hg-path() {
git config -f $(hg root)/.hg/hgrc --add paths.$1 $2
awk '{$1=$1}1' $(hg root)/.hg/hgrc > /tmp/hgrc.tmp
mv /tmp/hgrc.tmp $(hg root)/.hg/hgrc
}
Then invoke it with:
$ add-hg-path remote1 https://path.to/remote1
If someone would li...
Getting Chrome to accept self-signed localhost certificate
...after adding the certificate to the system certificate store under Trusted Roots. Even though the certificate is listed as correctly installed when I click "View certificate information" in Chrome's HTTPS popup, it still insists the certificate cannot be trusted.
...
Get names of all keys in the collection
...p with $addToSet to get distinct keys across the entire collection. (Use $$ROOT for referencing the top level document.)
db.things.aggregate([
{"$project":{"arrayofkeyvalue":{"$objectToArray":"$$ROOT"}}},
{"$unwind":"$arrayofkeyvalue"},
{"$group":{"_id":null,"allkeys":{"$addToSet":"$arrayofkey...
How do I initialize a TypeScript object with a JSON object
...
TLDR: TypedJSON (working proof of concept)
The root of the complexity of this problem is that we need to deserialize JSON at runtime using type information that only exists at compile time. This requires that type-information is somehow made available at runtime.
Fortuna...
How can I pair socks from a pile efficiently?
...ll (because they have thread-local piles). At the end, all workers need to union their pile-sets. I believe that can be done in O(log (worker count * piles per worker)) if the workers form an aggregation tree.
What about the element distinctness problem? As the article states, the element distinct...