Grid Painting

Grid Painting

Moderate

This mission paints designated cells in a 5x5 grid with a brush. And return its minimum number of steps.

  • Each cell is assigned a letter of the alphabet from A to Y (Row-major order). Use this as input value.
  • You can paint vertically (or horizontally) consecutive cells with any width brush at a time.

NOTE:

  • Don't paint undesignated cells.
  • The cell may be painted multiple times.

example

Input: Designated cells (str).

Output: Minimum number of steps (int).

Examples: 

assert grid_painting("ABCFGHMRX") == 3
assert grid_painting("GHLMNRS") == 2
assert grid_painting("GHILNQRS") == 4
45
kurosawa4434
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