问题:对于正整数a,b,求整数x,y满足: axbygcd(a,b) 解法:ExtandedGCD 已知gcd(a,b)gcd(b,a mod b); 设gcd(a,b)d 假设已求出x1,y1满足bx1(a mod b)y1d(*) 因为a mod ba-(a div b)*b(**) (**)代入(*)得: ay1(x1-(a div b)*y1)bd 所以…
from pandas import *
import pandas as pd
from sqlalchemy import create_engine
engine create_engine("mysqlpymysql://root:wenwajiao127.0.0.1:3306/ryandb?charsetUTF8MB4")#charset设置用于mysql8.0的新型字符集,清根据你的需要设定
print(engi…
[html] 你知道什么是粘性布局吗?
MDN 是这样解释的:Sticky positioning can be thought of as a hybrid of relative and fixed positioning. A stickily positioned element is treated as relatively positioned until it crosses a specified thresh…