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# Weird Faculty

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Problem Statement
This semester you are taking a course taught by a faculty member who has a weird way of grading tests. In a test, n questions will be asked, and the correctness of the answers is already determined. For the ith question, the verdict will be v[i] (where 0 ≤ i < n). If v[i] = 1, the answer is correct but if v[i] = 0, the answer is wrong.

When a test is given, you have to answer the first k questions (indices 0 to k-1) where 0 ≤ k < n, and your friend has to answer the remaining questions (indices k to n-1) on the test. At the end, results are calculated as follows:

Choose the minimum k such that Your_result > YourFriend_result.

Function Description
Complete the function exam in the editor below. The function must return an integer that denotes the minimum number of questions you must answer to have Your_result > YourFriend_result.

`exam` has the following parameter(s):

v[v[0],…v[n-1]]: an array of integers

Constraints
1 ≤ n ≤ 105
v[i] ∈ {0,1} (where 0 ≤ i < n)

Sample Input 0

Sample Output 0

Explanation 0
n = 5
v = {1, 0, 0, 1, 0}

If you answer 0 questions (k=0) then Your_result = 0 and YourFriend_result = -1 (2 correct answers & 3 wrong answers).

Solution