1318. Minimum Flips to Make a OR b Equal to c 
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Problem
Given 3 positives numbers a, b and c. Return the minimum flips required in some bits of a and b to make ( a OR b == c ). (bitwise OR operation).
Flip operation consists of change any single bit 1 to 0 or change the bit 0 to 1 in their binary representation.
Example 1:
Input: a = 2, b = 6, c = 5 Output: 3 Explanation: After flips a = 1 , b = 4 , c = 5 such that (aORb==c)
Example 2:
Input: a = 4, b = 2, c = 7 Output: 1
Example 3:
Input: a = 1, b = 2, c = 3 Output: 0
Constraints:
1 <= a <= 10^91 <= b <= 10^91 <= c <= 10^9