init day3

2023/day3/src/main.rs

@@ -0,0 +1,44 @@
+use std::{fs::File, io::{self, BufRead}, path::Path, process::exit};
+#[derive(Debug)]
+struct Coord{
+    line_index: usize,
+    char_index: usize,
+}
+
+fn main() {
+    let symbol_ignore_list = ".123456789";
+    let mut result = 0;
+    // symbol_array is a list of a list of coords.
+    // each list this array represents a line
+    // inside the line is the list of the coords of each symbol 
+    let mut symbol_array: Vec<Vec<Coord>> = Vec::new();
+    // File hosts.txt must exist in the current path
+    if let Ok(lines) = read_lines("./input") {
+        // Consumes the iterator, returns an (Optional) String
+        let lines_array = lines.flatten().collect::<Vec<String>>();
+        // collect a list of all symbols
+        for line_index in 0..lines_array.len(){
+            let mut line_symbol_array: Vec<Coord> = Vec::new();
+            for char_index in 0..lines_array[line_index].len(){
+                let cur_char = lines_array[line_index].chars().collect::<Vec<char>>()[char_index];
+                if !symbol_ignore_list.contains(cur_char){
+                    let c = Coord{line_index:line_index,char_index:char_index};
+                    line_symbol_array.push(c);
+                }
+            }
+            symbol_array.push(line_symbol_array);
+        }
+
+        for line_index in 0..lines_array.len(){
+            for char_index in 0..lines_array[line_index].len(){
+        }
+    }
+}
+
+// The output is wrapped in a Result to allow matching on errors.
+// Returns an Iterator to the Reader of the lines of the file.
+fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
+where P: AsRef<Path>, {
+    let file = File::open(filename)?;
+    Ok(io::BufReader::new(file).lines())
+}