#927 · #2033 · Minimum Operations to Make a Uni-Value Grid(获取单值网格的最小操作数)

Given an m x n integer matrix grid and an integer x, one operation adds or subtracts x from any single element. Return the minimum number of operations to make all elements equal, or -1 if impossible. Constraints: 1 <= m, n <= 10^5, 1 <= m * n <= 10^5, 1 <= x, grid[i][j] <= 10^4.