基础 from sympy import * 数学格式输出: init_printing() 添加变量: x, y, z, a, b, c = symbols('x y z a b c') 声明分数: Rational(1, 3) \(\displaystyle \frac{1}{3}\) 化简式子: simplify((x**3 + x**2 - x - 1)/(x**2 + 2*x + 1)) \(\displaystyle x - 1\) 因式分解: expand((x + 2)*(x -
sympy主要用于符号计算 1,基本操作 from sympy import* #from sympy import pprint #x=Symbol('x')#也可以这么单个定义 #y=Symbol('y') x,y,i,n,t,k=symbols('x y i n t k')#注意空格,不是逗号! z=Symbol('z') print x+y+x-y print ((x+y)**2).expand()#展开 print ((x+y)**2).subs(x,1)#subs(old,new)
You are given an integer sequence a1,a2,…,ana1,a2,…,an. Find the number of pairs of indices (l,r)(l,r) (1≤l≤r≤n1≤l≤r≤n) such that the value of median of al,al+1,…,aral,al+1,…,ar is exactly the given number mm. The median of a sequence is the value of