ALG-E016EasyMath

Missing Sequence Identifier

numbers contains every integer from 0 through n except exactly one, where n is the array length. Return the missing integer.

Contract

input numbers: integer[]

return integer

Constraints

• All values are distinct
• 0 <= n <= 100000

Examples

Example 1

numbers = [3, 0, 1]

→ 2

Example 2

numbers = [0, 1]

→ 2

5 judge tests (2 shown above). Target complexity: O(n).

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