43 lines
948 B
Lua
43 lines
948 B
Lua
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--Lua 5.4.2
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local File = io.open("input.txt", "r")
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if not File then
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print("File not found")
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return
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end
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local SafeReports = 0
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for Line in File:lines() do
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local IsSafe = true
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local LastSign = 0
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local LastNumber
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for Number in Line:gmatch("%d+") do
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if not LastNumber then
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LastNumber = Number
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goto continue
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end
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local Difference = math.abs(Number - LastNumber)
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if Difference > 3 or Difference == 0 then
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IsSafe = false
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break
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end
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local Sign = (Number - LastNumber) > 0 and 1 or -1
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if LastSign == 0 then
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LastSign = Sign
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else
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if Sign ~= LastSign then
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IsSafe = false
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break
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end
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end
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LastNumber = Number
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::continue::
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end
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if IsSafe then
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SafeReports = SafeReports + 1
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end
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end
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print("Safe reports:", SafeReports)
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