For input like [1, 1, 1, 1, 1], the expected output is 0 1 2 3. Why is 0 1 1 2 no

[guest_user_251]

For input like [1, 1, 1, 1, 1], the expected output is 0 1 2 3.
Why is 0 1 1 2 not a valid output?

[nishtha_2]

because B!=C see the stmt