Added 2022, first few problems

3 files changed, 110 insertions, 0 deletions

diff --git a/2022/05/a.rs b/2022/05/a.rs
new file mode 100644
index 0000000..ae0e937
--- /dev/null
+++ b/2022/05/a.rs
@@ -0,0 +1,17 @@
+mod common;
+use common::*;
+
+fn apply_move(grid: &mut Vec::<Vec::<char>>, line: &str) {
+    let (n, from, to) = read_move(&line);
+
+    for _ in 0..n {
+        let x = grid[from-1].pop().unwrap();
+        grid[to-1].push(x);
+    }
+}
+
+fn main() {
+    let mut grid = get_grid_from_stdin();
+    apply_moves_from_stdin(&mut grid, apply_move);
+    print_top(&grid);
+}
diff --git a/2022/05/b.rs b/2022/05/b.rs
new file mode 100644
index 0000000..824ee5e
--- /dev/null
+++ b/2022/05/b.rs
@@ -0,0 +1,20 @@
+mod common;
+use common::*;
+
+fn apply_move(grid: &mut Vec::<Vec::<char>>, line: &str) {
+    let (n, from, to) = read_move(&line);
+
+    let first_moved = grid[from-1].len()-n;
+    let len = grid[from-1].len();
+    for i in first_moved..len {
+        let x = grid[from-1][i];
+        grid[to-1].push(x);
+    }
+    grid[from-1].drain(first_moved..len);
+}
+
+fn main() {
+    let mut grid = get_grid_from_stdin();
+    apply_moves_from_stdin(&mut grid, apply_move);
+    print_top(&grid);
+}
diff --git a/2022/05/common.rs b/2022/05/common.rs
new file mode 100644
index 0000000..1725f09
--- /dev/null
+++ b/2022/05/common.rs
@@ -0,0 +1,73 @@
+pub type Grid = Vec<Vec<char>>;
+
+fn read_rows() -> Vec<Vec<char>> {
+    let mut rows = Vec::<Vec::<char>>::new();
+    let mut line = String::new();
+    loop {
+        let mut row = Vec::<char>::new();
+
+        std::io::stdin().read_line(&mut line).unwrap();
+        let line_chars = line.as_bytes();
+        if line_chars[1] == '1' as u8 {
+            let _ = std::io::stdin().read_line(&mut line);
+            break;
+        }
+
+        let mut i = 0;
+        while i < line_chars.len() {
+            row.push(line_chars[i+1] as char);
+            i += 4;
+        }
+
+        rows.push(row);
+        line.clear();
+    }
+
+    rows
+}
+
+fn rows_to_grid(rows: &Vec<Vec<char>>) -> Grid {
+    let mut grid = vec![Vec::<char>::new(); rows[0].len()];
+    for row in rows.iter().rev() {
+        for i in 0..row.len() {
+            if row[i] != ' ' {
+                grid[i].push(row[i]);
+            }
+        }
+    }
+    grid
+}
+
+fn next_usize(line: &str, s: usize) -> (usize, usize) {
+    let i = line[s..].find(|c: char| c.is_digit(10)).unwrap() + s;
+    let j = line[i..].find(|c: char| c.is_whitespace()).unwrap() + i;
+    (line[i..j].parse::<usize>().unwrap(), j)
+}
+
+pub fn read_move(line: &str) -> (usize, usize, usize) {
+    let (n, i) = next_usize(line, 0);
+    let (from, i) = next_usize(line, i);
+    let (to, _) = next_usize(line, i);
+
+    (n, from, to)
+}
+
+pub fn get_grid_from_stdin() -> Grid {
+    rows_to_grid(&read_rows())
+}
+
+pub fn apply_moves_from_stdin<F: Fn(&mut Grid, &str) -> ()>(grid: &mut Grid, apply_move: F) {
+    let mut line = String::new();
+    while std::io::stdin().read_line(&mut line).unwrap() > 0 {
+        apply_move(grid, &line);
+        line.clear();
+    }
+}
+
+pub fn print_top(grid: &Grid) {
+    for column in grid {
+        let c = match column.last() { Some(d) => d, None => &'_' };
+        print!("{}", c);
+    }
+    println!();
+}