init

d04/src/a1.rs

@@ -0,0 +1,19 @@
+
+fn contains(v1 :&Vec<i32>, v2 :&Vec<i32>) -> bool {
+    if v1.len() < 2 || v1.len() < 2 { return false; }
+    return v1[0] <= v2[0] && v2[1] <= v1[1]; 
+}
+
+pub fn run(inp :Vec<String>) {
+    
+    let sum = inp.iter().map(|pair| {
+        let sec :Vec<&str> = pair.split(',').collect();
+        let first :Vec<i32> = sec[0].split('-').map(|p| p.parse::<i32>().unwrap()).collect(); 
+        let second :Vec<i32> = sec[1].split('-').map(|p| p.parse::<i32>().unwrap()).collect();
+        if contains(&first, &second) || contains(&second, &first) {1} else {0}
+        
+    }).sum::<i32>(); 
+
+    println!("a1: {}", sum); 
+
+}

d04/src/a2.rs

@@ -0,0 +1,21 @@
+
+fn contains(v1 :&Vec<i32>, v2 :&Vec<i32>) -> bool {
+    if v1.len() < 2 || v1.len() < 2 { return false; }
+    
+    return  (v1[0]..=v1[1]).contains(&v2[0]) ||
+            (v1[0]..=v1[1]).contains(&v2[1]); 
+}
+
+pub fn run(inp :Vec<String>) {
+    
+    let sum = inp.iter().map(|pair| {
+        let sec :Vec<&str> = pair.split(',').collect();
+        let first :Vec<i32> = sec[0].split('-').map(|p| p.parse::<i32>().unwrap()).collect(); 
+        let second :Vec<i32> = sec[1].split('-').map(|p| p.parse::<i32>().unwrap()).collect();
+        if contains(&first, &second) || contains(&second, &first) {1} else {0}
+        
+    }).sum::<i32>(); 
+
+    println!("a1: {}", sum); 
+
+}

d04/src/main.rs

@@ -0,0 +1,41 @@
+use std::io::BufRead; 
+
+mod a1; 
+mod a2; 
+
+fn read_file(path :&str) -> Vec<String> {
+
+    let file = std::fs::File::open(path); 
+    
+    return match file {
+     
+        Ok(handle) => {
+
+            let reader = std::io::BufReader::new(handle);
+
+            let mut vec : Vec<String> = vec![]; 
+
+            reader.lines().for_each(|elem| {
+                vec.push(elem.unwrap()); 
+            }); 
+
+            vec
+
+        }
+
+        Err(_) => vec![] 
+
+        
+    }
+
+}
+
+fn main() {
+    
+    let inp :Vec<String> = read_file("input.txt"); 
+
+    a1::run(inp.clone()); 
+
+    a2::run(inp);
+    
+}