Day 07 - Pearson Correlation Coefficient I.py

# ========================
#       Information
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# Direct Link: https://www.hackerrank.com/challenges/s10-pearson-correlation-coefficient/problem
# Difficulty: Easy
# Max Score: 30
# Language: Python

# ========================
#         Solution
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def std(x):
    return (sum([(i-(sum(x))/len(x))**2 for i in x])/len(x))**0.5

N = int(input())
X = list(map(float, input().split()))
Y = list(map(float, input().split()))

X_M = sum(X)/len(X)
Y_M = sum(Y)/len(Y)

X_S = std(X)
Y_S = std(Y)

print(round(sum([(i-X_M)*(j-Y_M) for i, j in zip(X, Y)])/(N*X_S*Y_S), 3))