day 10

day10/src/main.rs

@@ -0,0 +1,55 @@
+fn do_cycle(cycle: u64, x_reg: i64) {
+    let col = (cycle - 1) % 40;
+    
+    // println!("{} <= ")
+    if x_reg - 1 <= col.try_into().unwrap() && x_reg + 1 >= col.try_into().unwrap() {
+        print!("#");
+    } else {
+        print!(".");
+    }
+    
+    if col == 39 {
+        println!();
+    }
+}
+
+fn main() {
+    const INPUT: &str = include_str!("../input.txt");
+    const ADD_CYCLES: u64 = 2;
+
+    let mut strengths: Vec<i64> = Vec::new();
+    let mut cycles = 1u64;
+    let mut x_reg = 1i64;
+
+    do_cycle(cycles, x_reg);
+
+
+    for line in INPUT.lines() {
+
+        if line.starts_with("noop") {
+            cycles += 1;
+        } else {
+            let (_, operand) = line.split_once(' ').unwrap();
+            let operand = operand.parse::<i64>().unwrap();
+
+            for _ in 0..(ADD_CYCLES - 1) {
+                cycles += 1;
+                if (cycles + 20) % 40 == 0 {
+                    strengths.push((cycles as i64) * x_reg);
+                }
+                do_cycle(cycles, x_reg);
+            }
+
+            cycles += 1;
+            x_reg += operand;
+        }
+
+        if (cycles + 20) % 40 == 0 {
+            strengths.push((cycles as i64) * x_reg);
+        }
+        do_cycle(cycles, x_reg);
+    }
+
+    let sum: i64 = strengths.iter().sum();
+    println!("{}", sum);
+}