Hackerrank: Diagonal Difference

https://www.hackerrank.com/challenges/diagonal-difference

N=int(input())

matrix=[]
for i in range(N):
    list1=input().split()
    list1=list(map(int,list1))
    matrix.append(list1)

sumd1=0
sumd2=0
for i in range(N):
    sumd1+=matrix[i][i]

for i in range(N):
    sumd2+=matrix[N-1-i][i]

print(abs(sumd1-sumd2))

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