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zern/examples/puzzles/aoc2025_01.zr

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func part1[lines: Array] : void
password := 0
dial := 50
for i in 0..lines->size
line : str = array.nth(lines, i)
dir := line[0]
n := str.substr(line, 1, str.len(line) - 1) |> str.parse_i64()
if dir == 'L'
dial = dial - n
while dial < 0
dial = 100 + dial
else
dial = dial + n
while dial >= 100
dial = dial - 100
if dial == 0
password = password + 1
io.println_i64(password)
func part2[lines: Array] : void
password := 0
dial := 50
for i in 0..lines->size
line : str = array.nth(lines, i)
dir := line[0]
n := str.substr(line, 1, str.len(line) - 1) |> str.parse_i64()
if dir == 'L'
for i in 0..n
dial = dial - 1
if dial == 0
password = password + 1
if dial == -1
dial = 99
else
for i in 0..n
dial = dial + 1
if dial == 100
dial = 0
password = password + 1
io.println_i64(password)
func main[] : i64
~input, ok := io.read_text_file("input.txt")
if !ok
panic("failed to open input.txt")
lines := str.split(input, "\n")
part1(lines)
part2(lines)