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2.8 KiB
2.8 KiB
id, title, challengeType, dashedName
| id | title | challengeType | dashedName |
|---|---|---|---|
| 6a26df95efa55a2524399744 | Challenge 363: Bucket Fill 2 | 29 | challenge-363 |
--description--
Given a 2D grid of single-letter color strings and a target color, return the minimum number of flood fill "clicks" needed to make the entire grid the target color.
- Each click changes the clicked cell's color and the entire region of connected cells of the same color with the target color.
- Cells are connected horizontally and vertically (not diagonally).
--hints--
bucket_fill([["R", "R"], ["R", "R"]], "G") should return 1.
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(bucket_fill([["R", "R"], ["R", "R"]], "G"), 1)`)
}})
bucket_fill([["B", "B", "B"], ["B", "B", "B"], ["B", "B", "B"]], "B") should return 0.
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(bucket_fill([["B", "B", "B"], ["B", "B", "B"], ["B", "B", "B"]], "B"), 0)`)
}})
bucket_fill([["G", "Y", "Y"], ["G", "Y", "G"], ["Y", "Y", "G"]], "R") should return 3.
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(bucket_fill([["G", "Y", "Y"], ["G", "Y", "G"], ["Y", "Y", "G"]], "R"), 3)`)
}})
bucket_fill([["G", "G", "P", "Y"], ["O", "P", "P", "P"], ["O", "O", "P", "G"], ["G", "O", "O", "G"]], "P") should return 5.
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(bucket_fill([["G", "G", "P", "Y"], ["O", "P", "P", "P"], ["O", "O", "P", "G"], ["G", "O", "O", "G"]], "P"), 5)`)
}})
bucket_fill([["G", "G", "C", "C", "O"], ["B", "Y", "B", "Y", "O"], ["B", "J", "O", "J", "B"], ["G", "Y", "Y", "Y", "B"], ["G", "P", "P", "G", "G"]], "Y") should return 12.
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(bucket_fill([["G", "G", "C", "C", "O"], ["B", "Y", "B", "Y", "O"], ["B", "J", "O", "J", "B"], ["G", "Y", "Y", "Y", "B"], ["G", "P", "P", "G", "G"]], "Y"), 12)`)
}})
--seed--
--seed-contents--
def bucket_fill(grid, target_color):
return grid
--solutions--
def bucket_fill(grid, target_color):
rows = len(grid)
cols = len(grid[0])
visited = set()
def dfs(r, c, color):
if r < 0 or r >= rows or c < 0 or c >= cols:
return
if (r, c) in visited:
return
if grid[r][c] != color:
return
visited.add((r, c))
dfs(r + 1, c, color)
dfs(r - 1, c, color)
dfs(r, c + 1, color)
dfs(r, c - 1, color)
clicks = 0
for r in range(rows):
for c in range(cols):
if (r, c) not in visited and grid[r][c] != target_color:
dfs(r, c, grid[r][c])
clicks += 1
return clicks