Attempting more optimization on day12 part 1
This commit is contained in:
Timothy Warren
parent
9c2665ab61
commit
8b01dcc2cf
@ -23,6 +23,134 @@ impl Grid<char> {
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fn find_pos(&self, value: char) -> Option<usize> {
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self.vec.iter().position(|item| *item == value)
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}
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fn print(&self) {
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for r in 0usize..self.num_rows() {
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let range = self.row_first_idx(r)..=self.row_last_idx(r);
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let line: String = self.vec[range].iter().collect();
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println!("{}", line);
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}
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}
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fn get_index_for_move(&self, from: usize, dir: Direction) -> Option<usize> {
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let (mut x, mut y) = self.idx_xy(from);
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match dir {
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Direction::Up => {
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if y >= 1 {
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y -= 1;
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} else {
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return None;
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}
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}
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Direction::Down => {
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if y < self.num_rows() - 1 {
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y += 1;
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} else {
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return None;
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}
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}
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Direction::Left => {
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if x >= 1 {
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x -= 1;
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} else {
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return None;
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}
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}
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Direction::Right => {
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if x < self.num_cols() - 1 {
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x += 1;
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} else {
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return None;
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}
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}
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};
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Some(self.xy_idx(x, y))
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}
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fn is_valid_move(&self, start: usize, end: usize) -> bool {
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// Is the item within the grid?
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let start_char = self.get(start);
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let end_char = self.get(end);
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if start_char.is_none() || end_char.is_none() {
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return false;
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}
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// Is the elevation change 0 or 1?
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let start_char = *start_char.unwrap();
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let end_char = *end_char.unwrap();
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let start_char = start_char
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.to_digit(36)
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.expect(&format!("Should be a digit: {}", start_char)) as i32;
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let end_char = end_char
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.to_digit(36)
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.expect(&format!("Should be a digit: {}", end_char)) as i32;
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let diff = end_char - start_char;
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if diff > 1 || diff < 0 || end_char < start_char {
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return false;
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}
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let (start_x, start_y) = self.idx_xy(start);
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let (end_x, end_y) = self.idx_xy(end);
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let x_diff = usize::abs_diff(end_x, start_x);
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let y_diff = usize::abs_diff(end_y, start_y);
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// Have we moved 0 or 1 in a cardinal direction?
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match (x_diff, y_diff) {
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(0, 0) | (0, 1) | (1, 0) => true,
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_ => false,
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}
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}
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fn find_valid_moves(&self, start: usize) -> Vec<usize> {
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[
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Direction::Up,
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Direction::Down,
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Direction::Left,
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Direction::Right,
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]
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.into_iter()
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.map(|d| self.get_index_for_move(start, d))
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.filter(|m| m.is_some())
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.map(|m| m.unwrap())
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.filter(|m| self.is_valid_move(start, *m))
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.collect()
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}
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fn has_valid_neighbor(&self, idx: usize) -> bool {
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self.find_valid_moves(idx).len() > 0
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}
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fn filter_invalid(&mut self, from: usize) {
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let (ch, col_indexes, row_indexes) = {
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let ch = self.get(from).unwrap();
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let (col, row) = self.idx_xy(from);
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let col_indexes = self.get_column_indexes(col);
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let row_indexes = self.get_row_indexes(row);
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(ch, col_indexes, row_indexes)
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};
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self.vec = self.vec
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.clone()
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.into_iter()
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.enumerate()
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.map(|(idx, c)| {
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if c != *ch {
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return c;
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}
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return if self.has_valid_neighbor(idx) && (col_indexes.contains(&idx) || row_indexes.contains(&idx)) {
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c
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} else {
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'0'
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}
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})
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.collect();
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}
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}
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// ----------------------------------------------------------------------------
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@ -137,97 +265,13 @@ impl Pathfinder {
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self.end_idx = end;
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self.grid.vec[start] = 'a';
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self.grid.vec[end] = 'z';
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self.grid.filter_invalid(start);
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self.tree.idx = start;
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}
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fn get_index_for_move(&self, from: usize, dir: Direction) -> Option<usize> {
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let (mut x, mut y) = self.grid.idx_xy(from);
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match dir {
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Direction::Up => {
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if y >= 1 {
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y -= 1;
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} else {
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return None;
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}
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}
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Direction::Down => {
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if y < self.grid.num_rows() - 1 {
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y += 1;
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} else {
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return None;
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}
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}
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Direction::Left => {
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if x >= 1 {
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x -= 1;
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} else {
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return None;
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}
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}
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Direction::Right => {
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if x < self.grid.num_cols() - 1 {
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x += 1;
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} else {
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return None;
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}
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}
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};
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Some(self.grid.xy_idx(x, y))
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}
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fn is_valid_move(&self, start: usize, end: usize) -> bool {
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// Is the item within the grid?
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let start_char = self.grid.get(start);
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let end_char = self.grid.get(end);
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if start_char.is_none() || end_char.is_none() {
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return false;
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}
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// Is the elevation change 0 or 1?
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let start_char = *start_char.unwrap();
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let end_char = *end_char.unwrap();
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let start_char = start_char
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.to_digit(36)
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.expect(&format!("Should be a digit: {}", start_char)) as i32;
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let end_char = end_char
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.to_digit(36)
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.expect(&format!("Should be a digit: {}", end_char)) as i32;
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let diff = end_char - start_char;
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if diff > 1 || diff < 0 || end_char < start_char {
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return false;
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}
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let (start_x, start_y) = self.grid.idx_xy(start);
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let (end_x, end_y) = self.grid.idx_xy(end);
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let x_diff = usize::abs_diff(end_x, start_x);
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let y_diff = usize::abs_diff(end_y, start_y);
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// Have we moved 0 or 1 in a cardinal direction?
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match (x_diff, y_diff) {
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(0, 0) | (0, 1) | (1, 0) => true,
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_ => false,
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}
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}
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fn find_valid_moves(&self, start: usize) -> Vec<usize> {
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[
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Direction::Up,
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Direction::Down,
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Direction::Left,
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Direction::Right,
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]
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.into_iter()
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.map(|d| self.get_index_for_move(start, d))
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.filter(|m| m.is_some())
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.map(|m| m.unwrap())
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.filter(|m| self.is_valid_move(start, *m))
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.collect()
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}
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fn add_children(&mut self, node: &mut Node, idx: usize) {
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let possible_moves = self.find_valid_moves(idx);
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let possible_moves = self.grid.find_valid_moves(idx);
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for m in possible_moves {
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if node.contains(m) {
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@ -273,7 +317,8 @@ fn main() {
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let file_str = include_str!("input.txt");
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let mut finder = Pathfinder::from_file_str(file_str);
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dbg!(finder);
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// dbg!(finder);
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finder.grid.print();
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// let shortest_path = finder.find_shortest_path();
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// println!("Part 1: Fewest steps: {}", shortest_path.get_len());
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@ -295,13 +340,14 @@ mod tests {
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fn find_valid_moves() {
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let finder = get_finder();
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assert_eq!(finder.find_valid_moves(finder.start_idx), vec![8, 1]);
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assert_eq!(finder.find_valid_moves(8), vec![0, 16, 9]);
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assert_eq!(finder.grid.find_valid_moves(finder.start_idx), vec![8, 1]);
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assert_eq!(finder.grid.find_valid_moves(8), vec![0, 16, 9]);
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}
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#[test]
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fn find_shortest_path() {
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let mut finder = get_finder();
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finder.grid.print();
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let shortest = finder.find_shortest_path();
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assert_eq!(shortest.get_len(), 31);
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