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O(N)Solution -
l=0 p=0 for i in range(len(a)): l+= a[i][i] p+= a[i][len(a)-1-i]
print(abs(l-p))
Diagonal Difference
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O(N)Solution -
l=0 p=0 for i in range(len(a)): l+= a[i][i] p+= a[i][len(a)-1-i]
print(abs(l-p))