The problem instance describes a scenario where there are 20 distinct floor tiles arranged in a 5×4 layout (we have rows 0, 1, 2, 3, 4 and columns 1, 2, 3, 4), labeled tile_0-1 (located in the top left corner of the grid) through tile_4-4 (located in the bottom right corner of the grid). Two robots (robot1 and robot2) are present, each able to hold exactly one color of paint at a time. The two paint colors available are white and black.

Robot Positions and Paint:
- Robot1 begins on the tile labeled tile_1-1 and is currently holding the color white.
- Robot2 begins on the tile labeled tile_1-2 and is currently holding the color black.

Available Colors: Both white and black are available to be switched to if needed.

Tiles with Clear Status: 
- Every tile in the grid is clear except for tile_1-1 (occupied by robot1) and tile_1-2 (occupied by robot2). 
- Thus, tile_0-1, tile_0-2, tile_0-3, tile_0-4 in row 0
- tile_1-3, tile_1-4 in row 1
- tile_2-1, tile_2-2, tile_2-3, tile_2-4 in row 2
- tile_3-1, tile_3-2, tile_3-3, tile_3-4 in row 3
- and tile_4-1, tile_4-2, tile_4-3, tile_4-4 in row 4 are all not painted and not occupied.

Adjacency: 
- Adjacency (which tiles lie directly above, below, left, or right of each other) is defined for every position in the 5×4 zone. For example, tile_1-n is immediately above tile_2-n, tile_0-n is immediately above tile_1-n, and so forth, where tile_0-1 is in the top left corner of the tile grid and tile_4-4 is in the bottom right corner of the tile grid. 
- Similarly, each tile has left and right neighbors within the same row, provided they exist in the grid. All of these adjacencies are valid ways for a robot to move.
- The robot cannot move outside the bounds of the grid.