Advent 2025 Day 7 Part 1 & 2
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Jos van Goor
parent
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6 changed files with 250 additions and 2 deletions
142
advent_of_code_2025/src/day7/input.txt
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advent_of_code_2025/src/day7/input.txt
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2
advent_of_code_2025/src/day7/mod.rs
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advent_of_code_2025/src/day7/mod.rs
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pub mod part1;
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pub mod part2;
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42
advent_of_code_2025/src/day7/part1.rs
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42
advent_of_code_2025/src/day7/part1.rs
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fn print_map(rows: &[Vec<u8>]) {
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for row in rows {
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println!("{}", unsafe { str::from_utf8_unchecked(row) });
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}
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}
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pub fn solve(input: &str) {
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let mut rows = input.lines().map(|line| line.as_bytes().to_vec()).collect::<Vec<_>>();
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let (beam, _) = rows[0].iter().enumerate().find(|(_, ch)| **ch == b'S').unwrap();
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let mut beams = [false].repeat(rows[0].len());
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let mut new_beams = beams.clone();
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beams[beam] = true;
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// print_map(&rows);
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let mut splits = 0;
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for row in rows.iter_mut() {
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for (idx, active) in beams.iter().enumerate() {
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if !active {
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continue;
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}
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if row[idx] == b'^' {
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splits += 1;
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new_beams[idx - 1] = true;
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new_beams[idx] = false;
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new_beams[idx + 1] = true;
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row[idx - 1] = b'|';
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row[idx + 1] = b'|';
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} else {
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row[idx] = b'|';
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new_beams[idx] = true;
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}
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}
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beams = new_beams.clone();
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new_beams.fill_with(|| false);
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}
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// print_map(&rows);
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println!("splits: {splits}");
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}
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46
advent_of_code_2025/src/day7/part2.rs
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advent_of_code_2025/src/day7/part2.rs
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pub fn solve(input: &str) {
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let rows = input.lines().map(|line| line.as_bytes()).collect::<Vec<_>>();
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let (beam, _) = rows[0].iter().enumerate().find(|(_, ch)| **ch == b'S').unwrap();
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let mut beams = [false].repeat(rows[0].len());
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let mut new_beams = beams.clone();
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beams[beam] = true;
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for row in rows.iter() {
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for (idx, active) in beams.iter().enumerate() {
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if !active {
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continue;
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}
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if row[idx] == b'^' {
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new_beams[idx - 1] = true;
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new_beams[idx + 1] = true;
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} else {
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new_beams[idx] = true;
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}
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}
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beams = new_beams.clone();
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new_beams.fill(false);
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}
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// now we now where the beams land at the bottom level, so now we need to solve it upwards again.
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let mut timelines = beams.iter().map(|b| if *b { 1u64 } else { 0u64 }).collect::<Vec<_>>();
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let mut new_timelines = timelines.clone();
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new_timelines.fill(0);
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for row in rows.iter().rev() {
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for (idx, fill) in row.iter().enumerate() {
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if *fill == b'^' {
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new_timelines[idx] = timelines[idx - 1] + timelines[idx + 1];
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} else {
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new_timelines[idx] = timelines[idx];
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}
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}
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timelines = new_timelines.clone();
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new_timelines.fill(0);
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}
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println!("possible paths: {}", timelines.iter().max().unwrap());
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}
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16
advent_of_code_2025/src/day7/test.txt
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advent_of_code_2025/src/day7/test.txt
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use paste::paste;
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mod utility;
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solve_day!{6}
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// test_day!{6}
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solve_day!{7}
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// test_day!{7}
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