相关系数计算

import math
def solve(____):
    n = len(____)
    mean1 = sum(____) / n
    mean2 = sum(____) / n
    cov = sum((____) * (____) for r1, r2 in zip(____)) / (____)
    var1 = sum((____) ** ____ for r in returns1) / (____)
    var2 = sum((____) ** ____ for r in returns2) / (____)
    correlation = cov / (math.sqrt(____) * math.sqrt(____))
    return round(____)