S10 Day 0: Weighted Mean

1 개요

• https://www.hackerrank.com/challenges/s10-weighted-mean/problem

2 Python

N = int(input())
X = list(map(int, input().split()))
W = list(map(int, input().split()))
sum_X = sum([a*b for a,b in zip(X,W)])
print(round((sum_X/sum(W)),1))
# 32.0

3 R

a <- scan("stdin")
n <- a[1]
x <- a[2:(n+1)]
w <- a[(n+2):(2*n+1)]
cat( format(sum(x*w)/sum(w),nsmall=1) )

lines <- readLines(file('stdin', open='r'))
x <- as.numeric(unlist(strsplit(lines[2],split=" ")))
w <- as.numeric(unlist(strsplit(lines[3],split=" ")))
cat( format(sum(x*w)/sum(w),nsmall=1) )