Easy10 min

Find the Missing Number

An array contains distinct numbers from 0 through n with one number missing. Return that number.

Your function

Implement solve(value, extra) in JavaScript. Return the answer; printing alone does not count as a result.

Examples

Input: [[0,1,3]]
Output: 2
Input: [[1]]
Output: 0

Constraints

Input contains at most 1,000 values or characters. Numbers are finite integers. Inputs follow the structure shown in the examples.

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