This is a phone interview. The interviewer asked me several background questions. And followed a coding problem online. Here the question is. There are two arrays saved integers. Try to find cow and bull. Bull here means the same two numbers which are at the same index in those two arrays. And cow means the same two numbers which are not at the same index. For instance, array1 = [1,4,9] array2 = [1,9,6] so the bull is [1] and the cow is [9]