## Numpy

numpy you should learn some basic math,like matrix,integral,probablity and statistics. You can learn https://numpy.org from if you wanna more get function reference print(help(numpy.xxxx)) Constructing a multidimensional array numpy.array() It must force conversion if the data is not the same type in array: eg: # constructing a array # one dimensional array vector = numpy.array([5,10,15,20]) # 2D array，action it has two [] matrix = numpy.array([[5,10,15],[20,25,30],[35,40,45]]) print(vector) print(matrix) It's hard to constructing a array which have dimensional more than three mumpy/0.ipynb/13*14 Checking the structure of a array,we mostly use it to debug. print(xxxx.shape) search print(xxxx[x......

## How to set up a jupyterlab in vps

cause I'm very sad that i left my laptop at school,but I can't have fun all the time,So I rent a vps which have high performance than I have and set up a jupyterlab on it,It's very nice that I can play some funny things on it.I have tried to use a Cloud Studio on Tencent,it will let us thought is my data safe enough? install install jupyterlab pip3 install jupyterlab setup login password create a python document named a.py,write as follows: from notebook.auth import passwd passwd() you will get a hash password when you input your password as the a.py runs python3 a.py generate a config,your will get the config address when it finished jupyter notebook --genera......

## TwoSum IN LeetCode

quetion Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the same element twice. Example: Given nums = [2, 7, 11, 15], target = 9, Because nums + nums = 2 + 7 = 9, return [0, 1]. Solution C int* twoSum(int* nums, int numsSize, int target, int* returnSize){ int x,y,m,n; int* array = (int*)malloc(2 * sizeof(int)); while(x <= (numsSize - 2)){ y = x + 1; while(y <= (numsSize - 1)){ if((*(nums + x) + *(nums + y) ) == target ){ m = x; n = y; break; ......

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