61 lines
1.0 KiB
Lua
61 lines
1.0 KiB
Lua
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#!/usr/bin/env luajit
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require("utils")
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local grid = {}
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for line in io.lines(arg[3]) do
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local row = {}
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for char in chars(line) do
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table.insert(row, tonumber(char))
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end
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table.insert(grid, row)
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end
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function printgrid()
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for r, row in pairs(grid) do
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for c, cell in pairs(row) do
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if cell > 9 then
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io.write('*')
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else
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io.write(cell)
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end
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end
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io.write('\n')
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end
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end
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printgrid()
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function flash(grid, r, c)
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grid[r][c] = grid[r][c] + 1
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if grid[r][c] == 10 then
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for dr = -1, 1 do if 0 < r + dr and r + dr <= #grid then
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for dc = -1, 1 do if 0 < c + dc and c + dc <= #grid[r] then
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flash(grid, r + dr, c + dc)
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end end
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end end
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end
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end
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for step = 1, math.huge do
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for r, row in pairs(grid) do
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for c, cell in pairs(row) do
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flash(grid, r, c)
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end
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end
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local flashes = 0
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for r, row in pairs(grid) do
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for c, cell in pairs(row) do
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if cell > 9 then
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grid[r][c] = 0
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flashes = flashes + 1
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end
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end
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end
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print(flashes)
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printgrid()
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if flashes == #grid * #grid[1] then
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print(step)
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break
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end
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end
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