Given a 2D array where all rows are sorted, write a program to sort the array.\n\n**Example 1:**\n```\nInput:\n[[ 5, 12, 17, 21, 23],\n [ 1,  2,  4,  6,  8],\n [12, 14, 18, 19, 27],\n [ 3,  7,  9, 15, 25]]\n\nOutput:\n[[ 1,  2,  3,  4,  5],\n [ 6,  7,  8,  9, 12],\n [12, 14, 15, 17, 18],\n [19, 21, 23, 25, 27]]\n```\n\n**Follow-up:**\nCan you do it **in-place**?

Given a 2D array where all rows are sorted, write a program to sort the array.\n\nExample 1:\n\nInput:\n[[ 5, 12, 17, 21, 23],\n [ 1,  2,  4,  6,  8],\n [12, 14