n = 5 # n can be anything
sum = 0
for i in range(n):
for j in range(n):
sum += 1
print(sum)
We’re told the time complexity of this code is 5n2+2n+4. Then we add sum = 0
to the outer loop. This adds n
operations. So the solution should be 5n2+3n+4, not 5n2+4n+4.