day01 and day03 part 2 solutions

2016/day03/src/main.rs

@@ -15,7 +15,34 @@ fn part_1(input: &String) {
 }
 
 fn part_2(input: &String) {
-    ;
+    //I am not skill enough with iterator adaptors to use .as_slice().chunks(3)
+    //so we will do things the lazy way. sad
+    let mut triangles = vec![vec![0; 3]; 3];
+    let mut read_lines = 3;
+    let mut total = 0; //total good triangles
+    for line in input.lines().map(|l| l.to_string()).collect::<Vec<String>>().iter() {
+        let values = line.trim().split_whitespace().map(|v| v.parse::<i32>().unwrap()).collect::<Vec<_>>();
+        //println!("Values are {:?}", values);
+        triangles[0][3 - read_lines] = values[0];
+        triangles[1][3 - read_lines] = values[1];
+        triangles[2][3 - read_lines] = values[2];
+        read_lines = read_lines - 1;
+         if read_lines == 0 {
+             //process our triangles
+             let good = triangles
+                .iter()
+                .filter(|v| {
+                    //println!("filtering {:?}", v);
+                    v.iter().fold(0, |sum, x| sum + x) > 2 * v.iter().max().unwrap() }
+                )
+                .collect::<Vec<_>>()
+                .len();
+             //println!("Found {} good ones from this set", good);
+             total = total + good;
+             read_lines = 3; //reset
+         }
+    }
+    println!("Part 2: there are {} good triangles", total);
 }
 
 fn main() {
@@ -24,4 +51,5 @@ fn main() {
     file.read_to_string(&mut input).expect("could not read file");
 
     part_1(&input);
+    part_2(&input);
 }