Python: Finding all the max values in a 2D array, choosing the most North west point out of them, and identifying its index i,j? : Suppose there's a 2D array in python. I only need to find the index of an element that has the highest value. 

However, there could be multiple elements that have the highest value. My objective is to find the index of any one of them, and the preference is to reduce time and space complexity. 

How do I do this? 