From 86bac31392a76da84817eec020d2b84d099b3cc1 Mon Sep 17 00:00:00 2001
From: mhsn <mail@mhsn.net>
Date: Wed, 18 Mar 2026 21:48:13 +0000
Subject: add other challenges support

---
 2025/04/rust/src/main.rs | 66 ------------------------------------------------
 1 file changed, 66 deletions(-)
 delete mode 100644 2025/04/rust/src/main.rs

(limited to '2025/04/rust/src')

diff --git a/2025/04/rust/src/main.rs b/2025/04/rust/src/main.rs
deleted file mode 100644
index 3b13140..0000000
--- a/2025/04/rust/src/main.rs
+++ /dev/null
@@ -1,66 +0,0 @@
-use std::{collections::VecDeque, io};
-
-fn main() {
-    let mut grid: Vec<Vec<Option<usize>>> = io::stdin()
-        .lines()
-        .flatten()
-        .map(|line| line.chars().map(|ch| (ch == '@').then_some(0)).collect())
-        .collect();
-
-    // count neighbours
-    points(&grid)
-        .collect::<Vec<_>>()
-        .into_iter()
-        .for_each(|p @ (x, y)| {
-            let ns = neighbours(p, &grid).count();
-            if let Some(n) = grid[y][x].as_mut() {
-                *n = ns;
-            }
-        });
-
-    let mut stack = points(&grid)
-        .filter(|&(x, y)| grid[y][x].is_some_and(|n| n < 4))
-        .collect::<VecDeque<_>>();
-    let silver = stack.len();
-    let mut gold = 0;
-
-    while let Some(p @ (x, y)) = stack.pop_back() {
-        if grid[y][x].take().is_none() {
-            continue;
-        }
-        gold += 1;
-        // reduce neighbours' neighbour counts by 1
-        neighbours(p, &grid)
-            .collect::<Vec<_>>()
-            .into_iter()
-            .for_each(|(nx, ny)| {
-                if let Some(n) = grid[ny][nx].as_mut() {
-                    *n -= 1;
-                    if *n < 4 {
-                        stack.push_back((nx, ny))
-                    }
-                }
-            });
-    }
-
-    println!("silver: {silver}");
-    println!("gold: {gold}");
-}
-
-fn neighbours<T>(
-    (x, y): (usize, usize),
-    grid: &Vec<Vec<Option<T>>>,
-) -> impl Iterator<Item = (usize, usize)> {
-    let xs = x.saturating_sub(1)..=(x + 1).min(grid.first().unwrap().len() - 1);
-    let ys = y.saturating_sub(1)..=(y + 1).min(grid.len() - 1);
-
-    xs.flat_map(move |nx| ys.clone().map(move |ny| (nx, ny)))
-        .filter(move |n| *n != (x, y))
-        .filter(|&(nx, ny)| grid.get(ny).and_then(|row| row.get(nx)).unwrap().is_some())
-}
-
-fn points<T>(grid: &Vec<Vec<T>>) -> impl Iterator<Item = (usize, usize)> {
-    let xs = 0..grid.first().unwrap().len();
-    let ys = 0..grid.len();
-    xs.flat_map(move |x| ys.clone().map(move |y| (x, y)))
-}
-- 
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