## Notes on brush questions of sword finger Offer

Mind map
remarks:
Most of the questions and solutions of the sword finger Offer are the crystallization of the leaders in the solution area. They are only used for personal learning
Positive sequence Edition
03 duplicate number in array
Title: find duplicate numbers in the array.
All numbers in an array num of length n are in the ra ...

Posted by **alecapone** on *Sat, 22 Jan 2022 08:40:18 +0100*

## Design and Simulation of two-dimensional path planning algorithm based on particle swarm optimization

catalogue
1 particle swarm optimization
2 two dimensional environment modeling
3 path planning
3.1 initialization
3.2 fitness function
3.3 simulation results
1 particle swarm optimization
yes Particle swarm optimization The summary is as follows: particle swarm optimization algorithm is a population-based search process, in whic ...

Posted by **mvidberg** on *Sat, 22 Jan 2022 07:22:45 +0100*

## OI linear algebra - matrix

OI linear algebra - matrix
This chapter only discusses linear algebra in OI. For too advanced knowledge of linear algebra, please refer to other textbooks.
Matrix and vector
Matrix is a mathematical concept, which corresponds to a two-dimensional array in a computer. For example:
A
...

Posted by **jamfrag** on *Sat, 22 Jan 2022 05:48:41 +0100*

## NOJ-Python programming assignment of Northwest University of technology 31-40

Northwest University of technology NOJ-Python programming problem set: Noj Python Programming: Season 1: season 1-easy (1-10) Noj Python Programming: Season 2: Season 2 snippet (11-20) Noj Python Programming: Season 3: season 3-loop (21-30) NOJ-Python programming: Season 4: enumeration algorithm (31-40) NOJ-Python programming: Season 5: modular ...

Posted by **ypkumar** on *Sat, 22 Jan 2022 05:21:27 +0100*

## Niuke IOI week 27 - popularity group

A. Little H's kitten
Title Link
meaning of the title
Take the x-axis and y-axis as the wall, the origin as the corner, and the kitten is in the corner. Give several points to find out whether the kitten can be surrounded in the corner with the fence around the point, and find the shortest total length of the fence
thinking
1. A sim ...

Posted by **coja1** on *Sat, 22 Jan 2022 04:52:09 +0100*

## HiveSql interview question 29 -- find the maximum number of people online and the peak time period [accumulator idea, timing analysis]

catalogue
0 demand analysis
1 data preparation
2 data analysis
3 Summary
0 demand analysis
The data is the anchor ID,stt represents the start time and edt represents the next time.
idsttedt10012021-06-14 12:12:122021-06-14 18:12:1210032021-06-14 13:12:122021-06-14 16:12:1210042021-06-14 13:15:122021-06-14 20:12:1210022021-06-14 15:12:12 ...

Posted by **Mzor** on *Sat, 22 Jan 2022 04:45:39 +0100*

## OpenCV53: Image Denoising

target
In this chapter, you will learn
Nonlocal mean denoising algorithm for removing noise in imageLearn different functions
cv2.fastNlMeansDenoising()cv2.fastNlMeansDenoisingColored()cv2.fastNlMeansDenoisingMulti()cv2.fastNlMeansDenoisingColoredMulti()
theory
In the previous chapters, we have seen many image smoothing techniques, such ...

Posted by **ICKelly** on *Sat, 22 Jan 2022 02:59:50 +0100*

## Machine learning notes 2 -- K-nearest neighbor method and kd tree

1. Theoretical part
1.1 K nearest neighbor method
1．
k
k
k-nearest neighbor method is a basic and simple classification and regression method.
k
k
The basic method of k-nearest ...

Posted by **sixdollarshirt** on *Sat, 22 Jan 2022 02:37:44 +0100*

## [data structure and algorithm] - time complexity and space complexity

Algorithm efficiency
Measuring the quality of an algorithm depends on the efficiency of the algorithm, and the efficiency of the algorithm is measured by two dimensions of time and space, namely time complexity and space complexity. Time complexity mainly measures the speed of an algorithm, and space complexity measures the additional spac ...

Posted by **hayw0027** on *Fri, 21 Jan 2022 23:33:27 +0100*

## [platinum sulfide] central cities and towns

Central town problem
Problem solution
In essence, it is a very classic long chain dissection dp problem.
We can remember
d
p
u
,
i
...

Posted by **Chafikb** on *Fri, 21 Jan 2022 20:23:06 +0100*