You are given positions of houses and heaters on a horizontal line, find out the minimum radius of heaters so that all houses could be covered by those heaters.
So, your input will be the positions of houses and heaters separately, and your expected output will be the minimum radius standard of heaters.
First argument will be a 1D array, A, denoting the positions of houses. Second argument will be a 1D array, B, denoting the positions of heaters.
Return an integer that represents the minimum radius.
0 <= A.size(), B.size() <= 25000 0 <= A[i], B[i] <= 10^9
Input: A: [1,2,3] B:  Output: 1 Explanation: The only heater was placed in position 2, and if we use the radius 1 standard, then all the houses can be warmed.
Input: A: [1,2,3,4] B: [1,4] Output: 1 Explanation: The two heater was placed in positions 1 and 4. We need to use the radius 1 standard, then all the houses can be warmed.
NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.