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Min value of x
Basic Accuracy: 13.63% Submissions: 22 Points: 1

Given 4 integers a,b,c and k . Find the min(non-negative Integral) value of x such that ax2+bx+c >= k.

Example 1:

Input: a = 4, b = 6, c = 5, k = 5
Output: 0
Explanation: 4*(0)2+6*0+5 = 5 which is
>= 5.


​Example 2:

Input: a = 1, b = 2, c = 3, k = 4 
Output: 1 
Explanation: 1*(1)2+2*1+3 = 6 which is
​>= 4.

Your Task:  
You don't need to read input or print anything. Your task is to complete the function minX() which takes a, b, c and k as inputs and returns the answer.

Expected Time Complexity: O(log k)
Expected Auxiliary Space: O(1)

Constraints:
1 ≤ a, b, c ≤ 105
1 ≤ k ≤ 109

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Min value of x

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