Part 1 done. Off-by-ones are dumb
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2f4e59a4b3
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@ -7,9 +7,9 @@ type Result = usize;
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fn processed_input(input: &str) -> Input {
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let mut result = vec![];
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for l in input.lines() {
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for l in input.trim().lines() {
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let mut v = vec![];
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for b in l.bytes() {
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for b in l.trim().bytes() {
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v.push(b - 48);
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}
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result.push(v);
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@ -19,6 +19,7 @@ fn processed_input(input: &str) -> Input {
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fn part1(input: &Input) -> Result {
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let mut trees: HashSet<(usize, usize)> = HashSet::new();
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let mut add = |y, x| {
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println!(
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"tree @ row {}, col {} ({})",
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@ -28,44 +29,53 @@ fn part1(input: &Input) -> Result {
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);
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trees.insert((y, x));
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};
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let h = input.len();
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let w = input[0].len();
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for y in 0..h {
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println!("width: {}, height: {}", w, h);
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for y in 1..=h - 2 {
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let row = &input[y];
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let mut tallest_left = row[0];
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let mut tallest_right = row[w - 1];
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println!(
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"scan left-to-right at row {} (tl: {}, tr: {})",
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y, tallest_left, tallest_right
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);
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let mut xd = 1;
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add(y, 0);
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add(y, w - 1);
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while xd < w {
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while xd < w - 1 {
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println!("{},{}", y, xd);
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if row[xd] > tallest_left {
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tallest_left = row[xd];
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add(y, xd);
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}
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let rx = w - 1 - xd;
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if row[rx] > tallest_right {
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tallest_right = row[rx];
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add(y, rx);
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let rxd = w - 1 - xd;
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if row[rxd] > tallest_right {
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tallest_right = row[rxd];
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add(y, rxd);
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}
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xd += 1;
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}
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}
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for x in 0..w {
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for x in 1..=w - 2 {
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let mut tallest_top = input[0][x];
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let mut tallest_bottom = input[h - 1][x];
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println!(
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"scan top-to-bottom at column {} (tt: {}, tb: {})",
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x, tallest_top, tallest_bottom
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);
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let mut yd = 1;
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add(0, x);
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add(h - 1, x);
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while yd < h {
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while yd < h - 1 {
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println!("{},{}", yd, x);
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if input[yd][x] > tallest_top {
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tallest_top = input[yd][x];
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add(yd, x);
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}
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let ry = h - 1 - yd;
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if input[yd][ry] > tallest_bottom {
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tallest_bottom = input[yd][ry];
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add(ry, x);
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let ryd = h - 1 - yd;
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if input[ryd][x] > tallest_bottom {
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tallest_bottom = input[ryd][x];
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add(ryd, x);
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}
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yd += 1;
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}
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@ -73,7 +83,7 @@ fn part1(input: &Input) -> Result {
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println!("{:?}", trees);
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trees.len()
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trees.len() + (2 * (h - 1)) + (2 * (w - 1))
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}
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fn part2(input: &Input) -> Result {
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@ -85,7 +95,8 @@ fn main() {
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eprintln!("{}\n\nAbove is your input file.\n\n", input_text);
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let input = processed_input(&input_text);
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common::show_answers(&part1(&input), &part2(&input))
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// 1755 for part 1 is too high
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// 1755 for part 1 is too high (so is 1750 in case off-by-one-ish) and so is 1745
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// 1705 is wrong
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// common::show_both_answers(&both_parts(&input))
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}
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