There are thousands of rays and triangles. We need to get all the intersections. If we use a normal two-level loop, we need O(mn) time complexity. Is there How to reduce the time complexity from O(
Author: Simo
Layer & matrix_Latex
determinant \[ \left |\begin{array}{cccc} 1 &6 & 9 \7 &90 & f(x) \9 & \psi(x) &g(x) \\end{array}\right| \]
$$\left |\ begin{array}{cccc}1 &6 & 9 \7 &90 & f(x) \9 & \psi(x) &g(x) \\end{array}\
Linear regression
0-Basic question Linear regression considers $n$ samples $\{\mathbf{x}_1,\mathbf{x}_2,\cdots,\mathbf {x}_n\}$, each sample corresponds to $m+1$ dimensional feature$\mathbf{x}_i=\{x_{i0},x_{i1},x
[Template] fast power
inline ll ksm(int x,int b){
int ans=1,base=x;
while(b){
if(b&1)ans*=x;
x*=x;
b>>=1;
}
return ans;
}
inline ll ksm(int x, int b){
int ans=1,base=x;
while(b){
if(b&1)ans*=x;
x*=x;
b>>=1;
}
return ans;
}
Common regular expression
[email protected] Only English letters, numbers, underscores, full stops, and underscores are allowed
^[a-zA-Z0-9_-][emailprotected ][a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$
高子航[email protect
SP1716 GSS3 dynamic DP (line segment tree + matrix multiplication)
Code:
#include
#define N 50001
#define ll long long
#define lson now<>1;
if(r>mid) t[now]=t[now]*t[rson];
}
void build(int l,int r,int now)
{
if(l==r)
{
t[now][0][0]=t[no
Is the operating system a big liar?
1 Chat Our programs lie quietly in a corner of the hard drive, waiting expectantly to be used by the owner. It is loaded by the operating system and then enters the memory to work, to be pr
Operating system development – start using QEMU from floppy drive
I have been reading BrokenThorn’s operating system development tutorial, I am creating and loading the second stage boot loader. This tutorial is for Windows, but I am doing this in Linux (Ubuntu 1
How to find the Android version name in programming?
I write code to find such an Android version
String version=Build.VERSION.RELEASE; By using this code I get the version number but I want the version name.
How to get the version name?
Operating system – How does the operating system perform compilation binaries?
When I studied process scheduling, this question came to my mind.
How does the operating system execute and control the execution of binary files and compiled files ? I think the OS may copy