1.Minimum Depth of Binary Tree // Recursive version, time complexity O( n), space complexity O(logn)
private static int minDepth(TreeNode root) {
if (root == null) return 0;
return Math.min(minDe
Category: Mathematics
Applied Mathematics is a general term for mathematical theories and methods with a clear application purpose. The study of how to apply mathematical knowledge to the branches of mathematics in other categories (especially science) can be said to be the opposite of pure mathematics. Including differential equations, vector analysis, matrix, Fourier transform, complex analysis, numerical methods, probability theory, mathematical statistics, operations research, control theory, combinatorial mathematics, information theory and many other branches of mathematics, as well as from various application fields The study of the mathematical problem presented. Computational mathematics can sometimes be regarded as part of applied mathematics.
Mathematics me – 2D video game
I am an amateur game programmer. I only do 2D games, no 3D things. I don’t have a background in mathematics, and many things trip me like bullet projections and angles.
I took two college-lev
GroupBY string and count in Linb
I have a collection. The coll has strings:
Location=”Theater=1, Name=regal, Area=Area1″
Location=”Theater=34, Name=Karm, Area=Area4445″ etc. I have to extract the name bits from the string.
R: How to resize my matrix by column
I have a disease matrix with the state state0CommercialA, where the columns are the states (i.e. “no disease”, “disease”, “death”) and the rows are the model period (i.e., 1, 2, 3,4, etc.).
I
Algorithm – thousands of lights with triangles in 3D space
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(
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;
}
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
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?