# 2033. Minimum Operations to Make a Uni-Value Grid """ you are given a 2d integer 'grid' of size 'm x n' and an integer 'x'. in one operation, you can add 'x' to or subtract 'x' from any element in the 'grid'. a uni-value grid is a grid where all the elements of it are equal. return the minimum number of operations to make the grid uni-valued. if it is not possible, return -1. """ class Solution(object): def minOperations(self, grid, x): """ :type grid: List[List[int]] :type x: int :rtype: int """ vals = sorted([i for j in grid for i in j]) diff = [abs(i - vals[0]) % x for i in vals] if any(i != 0 for i in diff): return -1 med = vals[len(vals) // 2] ans = sum(abs(i - med) // x for i in vals) return ans if __name__ == "__main__": obj = Solution() print(obj.minOperations(grid=[[2, 4], [6, 8]], x=2)) print(obj.minOperations(grid=[[1, 5], [2, 3]], x=1)) print(obj.minOperations(grid=[[1, 2], [3, 4]], x=2))