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import os { read_lines } | ||
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fn main() { | ||
inputs := read_lines('schematic.input')! | ||
println(part1(inputs)) | ||
println(part2(inputs)) | ||
} | ||
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fn part1(inputs []string) int { | ||
mut sum := 0 | ||
for x, input in inputs { | ||
mut number := 0 | ||
mut found := false | ||
for y, letter in input { | ||
if letter >= `0` && letter <= `9` { | ||
number = number * 10 + letter - u8(`0`) | ||
if !found { | ||
for dx in -1 .. 2 { | ||
for dy in -1 .. 2 { | ||
if x + dx >= 0 && x + dx < inputs.len && y + dy >= 0 | ||
&& y + dy < input.len { | ||
dl := inputs[x + dx][y + dy] | ||
if dl != `.` && (dl < `0` || dl > `9`) { | ||
found = true | ||
} | ||
} | ||
} | ||
} | ||
} | ||
} else { | ||
if found { | ||
sum += number | ||
} | ||
number = 0 | ||
found = false | ||
} | ||
} | ||
if number > 0 && found { | ||
sum += number | ||
} | ||
} | ||
return sum | ||
} | ||
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fn part2(inputs []string) int { | ||
mut sum := 0 | ||
for x, input in inputs { | ||
for y, letter in input { | ||
if letter != `*` { | ||
continue | ||
} | ||
mut numbers := []int{} | ||
for dx in -1 .. 2 { | ||
for dy in -1 .. 2 { | ||
if x + dx >= 0 && x + dx < inputs.len && y + dy >= 0 && y + dy < input.len { | ||
if number := try_read_number(inputs, x + dx, y + dy) { | ||
numbers << number | ||
if dy > -1 || (inputs[x + dx][y] >= `0` && inputs[x + dx][y] <= `9`) { | ||
break | ||
} | ||
} | ||
} | ||
} | ||
} | ||
if numbers.len >= 2 { | ||
sum += numbers[0] * numbers[1] | ||
} | ||
} | ||
} | ||
return sum | ||
} | ||
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fn try_read_number(inputs []string, x int, y int) ?int { | ||
if inputs[x][y] < `0` || inputs[x][y] > `9` { | ||
return none | ||
} | ||
mut my := y | ||
for my > 0 && inputs[x][my - 1] >= `0` && inputs[x][my - 1] <= `9` { | ||
my-- | ||
} | ||
mut number := 0 | ||
for my < inputs[x].len && inputs[x][my] >= `0` && inputs[x][my] <= `9` { | ||
number = number * 10 + inputs[x][my] - u8(`0`) | ||
my++ | ||
} | ||
return number | ||
} |
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